Kyushu University Academic Staff Educational and Research Activities Database
List of Papers
Suekuni Koichiro Last modified date:2021.10.15

Associate Professor / Department of Advanced Materials Science and Engineering / Faculty of Engineering Sciences


Papers
1. Yuta Shimizu, Koichiro Suekuni, Hikaru Saito, Pierric Lemoine, Emmanuel Guilmeau, Bernard Raveau, Raju Chetty, Michihiro Ohta, Toshiro Takabatake, Michitaka Ohtaki, Synergistic Effect of Chemical Substitution and Insertion on the Thermoelectric Performance of Cu26V2Ge6S32 Colusite, Inorg. Chem., 10.1021/acs.inorgchem.1c01321, 60, 11364-11373, 2021.07.
2. Bui Duc Long, Le Hong Thang, Nguyen Hong Hai, Koichiro Suekuni, Katsuaki Hashikuni, Tran Quang Minh Nhat, Wojciech Klich, Michitaka Ohtaki, Thermoelectric quaternary sulfide Cu2+xZn1−xSnS4 (x = 0–0.3): Effects of Cu substitution for Zn, Materials Science and Engineering: B, 10.1016/j.mseb.2021.115353, 272, 115353, 2021.07.
3. Nhat Quang Minh Tran, Michitaka Ohtaki, Koichiro Suekuni, Rapid Synthesis of W18O49 via Reactive Spark Plasma Sintering with Controlled Anisotropic Thermoelectric Properties, EVERGREEN, 8, 02, 344-350, 2021.06.
4. Ahrong Jeong, Koichiro Suekuni, Michitaka Ohtaki, Byung-Koog Jang, Thermoelectric properties of In- and Ga-doped spark plasma sintered ZnO ceramics, Ceramics International, 2021.05, [URL].
5. T. Hagiwara, K. Suekuni, P. Lemoine, A. R. Supka, R. Chetty, E. Guilmeau, B. Raveau, M. Fornari, M. Ohta, R. Al Rahal Al Orabi, H. Saito, K. Hashikuni, M. Ohtaki, Key Role of d0 and d10 Cations for the Design of Semiconducting Colusites: Large Thermoelectric ZT in Cu26Ti2Sb6S32 Compounds, Chemistry of Materials, 10.1021/acs.chemmater.1c00872, 33, 9, 3449-3456, 2021.04.
6. K. Hashikuni, K. Suekuni, H. Usui, R. Chetty, M. Ohta, T. Takabatake, M. Ohtakia, A comparative study of thermoelectric Cu2TrTi3S8 (Tr = Co and Sc) thiospinels: Enhanced Seebeck coefficient via electronic structure modification, Journal of Alloys and Compounds, 10.1016/j.jallcom.2021.159548, 871, 159548, 2021.03.
7. V. P. Kumar, S. Mitra, G. Guélou, A. R. Supka, P. Lemoine , B. Raveau, R. Al Rahal Al Orabi, M. Fornari, K. Suekuni, E. Guilmeau, Transport properties and electronic density of states of Zn-doped colusite Cu26Cr2Ge6S32, Appl. Phys. Lett., 117, 173902, 2020.10.
8. Kazunori Umeo, Koichiro Suekuni, Toshiro Takabatake, and Eiji Nishibori, Pressure-induced quenching of planar rattling in Cu10Zn2Sb4S13 studied by specific heat and x-ray diffraction measurements, Phys. Rev. B, 10.1103/PhysRevB.102.100302, 102, 100302(R), 2020.09.
9. Gabin Guélou, Ventrapati Pavan Kumar, Abdelhamid Bourhim, Pierric Lemoine, Bernard Raveau, Andrew Supka, Oleg I. Lebedev, Rabih Al Rahal Al Orabi, Marco Fornari, Koichiro Suekuni, Emmanuel Guilmeau, Toppling the Transport Properties with Cationic Overstoichiometry in Thermoelectric Colusite: [Cu26Cr2Ge6]1+δS32, ACS Appl. Energy Mater., 10.1021/acsaem.0c00726, 3, 4180-4185, 2020.04.
10. Yohan Bouyrie, Raju Chetty, Koichiro Suekuni, Noriyuki Saitou, Priyanka Jood, Noriko Yoshizawa, Toshiro Takabatake, Michihiro Ohta, Enhancement of the thermoelectric power factor by tuning the carrier concentration in Cu-rich and Ge-poor colusites Cu26+xNb2Ge6-xS32, J. Mater. Chem. C, 10.1039/d0tc00508h, 8, 6442-6449, 2020.03.
11. Takuya Tanimoto, Koichiro Suekuni, Taiki Tanishita, Hidetomo Usui, Terumasa Tadano, Taiga Kamei, Hikaru Saito, Hirotaka Nishiate, Chul Ho Lee, Kazuhiko Kuroki, and Michitaka Ohtaki, Enargite Cu3PS4: A Cu–S-Based Thermoelectric Material with a Wurtzite-Derivative Structure, Adv. Funct. Mater., 10.1002/adfm.202000973, 2000973, 2020.04, 銅ー硫化物系化合物半導体の一種であるエナーガイトCu3PS4のPをGeで置換すると優れた熱電性能が発現することを発見。従来熱電材料として研究されてきた銅ー硫化物系のほとんどが閃亜鉛鉱型の派生構造をとるのに対して、本研究で対象としたCu3PS4はウルツ鉱型の派生構造をとることが特徴である。この発見は、銅―硫黄系熱電材料の研究フィールドを、類似の(ウルツ鉱型派生の)結晶構造の化合物にも広げるものである。.
12. Takashi Matsui, Haruki Matsuno, Hisashi Kotegawa, Hideki Tou, Koichiro Suekuni, Takumi Hasegawa, Hiromi I. Tanaka, and Toshiro Takabatake, Precursor of Metal–Semiconductor Transition in Tetrahedrite Probed by Cu-NMR, JPS Conf. Proc., 10.7566/JPSCP.30.011075, 30, 011075, 2020.03.
13. Christophe Candolfi, Gabin Guélou, Cédric Bourgès, Andrew R. Supka, Rabih Al Rahal Al Orabi, Marco Fornari, Bernard Malaman, Gérard Le Caër, Pierric Lemoine, Vincent Hardy, Jean-Marc Zanotti, Raju Chetty, Michihiro Ohta, Koichiro Suekuni, Emmanuel Guilmeau, Disorder-driven glasslike thermal conductivity in colusite Cu26V2Sn6S32 investigated by Mössbauer spectroscopy and inelastic neutron scattering, PHYSICAL REVIEW MATERIALS, 10.1103/PhysRevMaterials.4.025404, 4, 025404, 2020.02.
14. Takashi Matsui, Haruki Matsuno, Hisashi Kotegawa, Hideki Tou, Koichiro Suekuni, Takumi Hasegawa, Hiromi I. Tanaka, Toshiro Takabatake, Zn-Substitution Effect on Metal-Semiconductor Transition in Tetrahedrite Cu12Sb4S13, JPS Conf. Proc. , 10.7566/JPSCP.29.013008, 29, 013008, 2020.02.
15. Taiki Tanishita, Koichiro Suekuni, Hirotaka Nishiate, Chul-Ho Lee, Michitaka Ohtaki, A strategy for boosting the thermoelectric performance of famatinite Cu3SbS4, Phys. Chem. Chem. Phys. , DOI: 10.1039/c9cp06233e, 22, 2081-2086, 2019.12.
16. Naoki Ishimatsu, Kei Yokoyama, Takahiro Onimaru, Toshiro Takabatake, Koichiro Suekuni, Naomi Kawamura, Satoshi Tsutsui, Masaichiro Mizumaki, Toshiaki Ina, Tetsu Watanuki, Vera Cuartero, Olivier Mathon, Sakura Pascarelli, Eiji Nishibori, and Tetsuo Irifune, Pressure-Induced Collapse of the Guest Eu Off-Centering in Type-I Clathrate Eu8Ga16Ge30, Journal of the Physical Society of Japan, 10.7566/JPSJ.88.114601, 88, 114601, 2019.10.
17. Ventrapati Pavan Kumar, Gabin Guelou, Pierric Lemoine, Bernard Raveau, Andrew R. Supka, Rabih Al Rahal Al Orabi, Marco Fornari, Koichiro Suekuni, Emmanuel Guilmeau, Copper‐Rich Thermoelectric Sulfides: Size‐Mismatch Effect and Chemical Disorder in the [TS4]Cu6 Complexes of Cu26T2Ge6S32 (T=Cr, Mo, W) Colusites, Angewandte Chemie International Edition, 10.1002/anie.201908579, 58, 15455-15463, 2019.09.
18. Suekuni, Koichiro; Usui, Hidetomo; Qiao, Siying; Hashikuni, Katsuaki; Hirano, Tatsuya; Nishiate, Hirotaka; Lee, Chul-Ho; Kuroki, Kazuhiko; Watanabe, Kosuke; Ohtaki, Michitaka; , Electronic structure and thermoelectric properties of Sn1.2−xNbxTi0.8S3 with a quasi-one-dimensional structure, Journal of Applied Physics, doi: 10.1063/1.5093183, 125, 175111, 2019.05.
19. Hathwar, Venkatesha R; Nakamura, Atsushi; Kasai, Hidetaka; Suekuni, Koichiro; Tanaka, Hiromi I.; Takabatake, Toshiro; Iversen, Bo B.; Nishibori, Eiji;, Low-temperature structural phase transitions in thermoelectric tetrahedrite, Cu12Sb4S13 and tennantite, Cu12As4S13, Crystal Growth & Design, doi.org/10.1021/acs.cgd.9b00385, 2019.05.
20. Matsui, Takashi; Matsuno, Haruki; Kotegawa, Hisashi; Tou, Hideki; Suekuni, Koichiro; Hasegawa, Takumi; Tanaka I., Hiromi; Takabatake Toshiro, First-Order Metal–Semiconductor Transition Triggered by Rattling Transition in Tetrahedrite Cu12Sb4S13: Cu-Nuclear Magnetic Resonance Studies, Journal of the Physical Society of Japan, 88, 054710, 2019.04.
21. Chetty, Raju; Kikuchi, Yuta; Bouyrie, Yohan; Jood, Priyanka; Yamamoto, Atsushi; Suekuni, Koichiro; Ohta Michihiro, Power generation from the Cu26Nb2Ge6S32-based single thermoelectric element with Au diffusion barrier, Journal of Materials Chemistry C, DOI: 10.1039/c9tc00868c, 7, 5184-5192, 2019.04.
22. Sato, Hitoshi; Nagasaki, Toshiki; Suekuni, Koichiro; Tanaka, I., Hiromi; Rousuli, Awabaikeli; Nakamura, Shogo; Kawamura, Naomi; Zheng, Xu-Guang; Fujii, Takenori; Takabatake, Toshiro, Cu 2p-1s x-ray emission spectroscopy of mineral tetrahedrite Cu12Sb4S13, Radiation Physics and Chemistry, 10.1016/j.radphyschem.2019.02.007, 2019.02.
23. Hashikuni, Katsuaki; Suekuni, Koichiro; Usui, Hidetomo; Chetty, Raju; Ohta, Michihiro; Kuroki, Kazuhiko; Takabatake, Toshiro; Watanabe, Kosuke; Ohtaki, Michitaka, Thermoelectric Properties and Electronic Structures of CuTi2S4 Thiospinel and Its Derivatives: Structural Design for Spinel-Related Thermoelectric Materials, Inorganic Chemistry, 10.1021/acs.inorgchem.8b02955, 58, 2, 1425-1432, 2019.01.
24. Suekuni, Koichiro; Shimizu, Yuta; Nishibori, Eiji; Kasai, Hidetaka; Saito Hikaru; Yoshimoto, Daichi; Hashikuni, Katsuaki; Bouyrie, Yohan; Chetty, Raju; Ohta, Michihiro; Guilmeau, Emmanuel; Takabatake, Toshiro; Watanabe, Kosuke; Ohtaki, Michitaka, Atomic-scale phonon scatterers in thermoelectric colusites with a tetrahedral framework structure, Journal of Materials Chemistry A, DOI: 10.1039/c8ta08248k, 2018.12.
25. Kumar, Ventrapati Pavan; Supka, Andrew R.; Lemoine, Pierric; Lebedev, Oleg I.; Raveau, Bernard; Suekuni, Koichiro; Nassif, Vivian; Orabi, Rabih Al Rahal Al; Fornari, Marco; Guilmeau, Emmanuel, High Power Factors of Thermoelectric Colusites Cu26T2Ge6S32 (T = Cr, Mo, W): Toward Functionalization of the Conductive “Cu–S” Network, Advanced Energy Materials, DOI: 10.1002/aenm.201803249, 2018.12.
26. Inui, M; Suekuni, K; Kajihara, Y; Hosokawa, S; Takabatake, T; Nakajima, Y; Matsuda K; Ohara, K; Uchiyama, H; Tsutsui, S, Static and dynamic structures of liquid Ba8Ga16Sn30: a melt of the thermoelectric clathrate compounds, Journal of Physics: Condensed Matter, 30, 455101, 2018.10.
27. Hashikuni, Katsuaki; Suekuni, Koichiro; Watanabe, Kosuke; Bouyrie, Yohan; Ohta, Michihiro; Ohtaki, Michitaka; Takabatake, Toshiro, Carrier concentration tuning in thermoelectric thiospinel Cu2CoTi3S8 by oxidative extraction of copper, JOURNAL OF SOLID STATE CHEMISTRY, 10.1016/j.jssc.2017.12.031, 259, 5-10, 2018.03.
28. Suekuni, Koichiro; Lee, Chul Ho; Tanaka, Hiromi I.; Nishibori, Eiji; Nakamura, Atsushi; Kasai, Hidetaka; Mori, Hitoshi; Usui, Hidetomo; Ochi, Masayuki; Hasegawa, Takumi; Nakamura, Mitsutaka; Ohira-Kawamura, Seiko; Kikuchi, Tatsuya; Kaneko, Koji; Nishiate, Hirotaka; Hashikuni, Katsuaki; Kosaka, Yasufumi; Kuroki, Kazuhiko; Takabatake, Toshiro, Retreat from Stress: Rattling in a Planar Coordination, ADVANCED MATERIALS, 10.1002/adma.201706230, 30, 13, 2018.03.
29. Bouyrie, Yohan; Ohta, Michihiro; Suekuni, Koichiro; Jood, Priyanka; Takabatake, Toshiro, Addition of Co, Ni, Fe and their role in the thermoelectric properties of colusite Cu26Nb2Ge6S32, JOURNAL OF ALLOYS AND COMPOUNDS, 10.1016/j.jallcom.2017.11.199, 735, 1838-1845, 2018.02.
30. Bourges, Cedric; Bouyrie, Yohan;Supka, Andrew R.; Orabi, Rabih Al Rahal Al; Lemoine, Pierric; Lebedev, Oleg I.; Ohta, Michihiro; Suekuni, Koichiro; Nassif, Vivian; Hardy, Vincent; Daou, Ramzy; Miyazaki, Yuzuru; Fornari, Marco; Guilmeau, Emmanuel, High-Performance Thermoelectric Bulk Colusite by Process Controlled Structural Disordering, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 10.1021/jacs.7b11224, 140, 6, 2186-2195, 2018.02.
31. Bouyrie, Yohan, Ohta, Michihiro, Suekuni, Koichiro, Kikuchi, Yuta, Jood, Priyanka, Yamamoto, Atsushi, Takabatake, Toshiro, Enhancement in the thermoelectric performance of colusites Cu(26)A(2)E(6)S(32) (A = Nb, Ta; E = Sn, Ge) using E-site non-stoichiometry, JOURNAL OF MATERIALS CHEMISTRY C, 10.1039/c7tc00762k, 5, 17, 4174-4184, 2017.05.
32. Kosaka, Yasufumi, Suekuni, Koichiro, Hashikuni, Katsuaki, Bouyrie, Yohan, Ohta, Michihiro, Takabatake, Toshiro, Effects of Ge and Sn substitution on the metal-semiconductor transition and thermoelectric properties of Cu12Sb4S13, Phys. Chem. Chem. Phys., 10.1039/C7CP00351J, 19, 8874-8879, 2017.03.
33. Hashikuni, Katsuaki, Suekuni, Koichiro, Usui, Hidetomo, Ohta, Michihiro, Kuroki, Kazuhiko, Takabatake, Toshiro, High power factor in thiospinels Cu2TrTi3S8 (Tr= Mn, Fe, Co, Ni) arising from TiS6 octahedron network, Applied Physics Letters, 109, 182110-1-182110-5, 2016.11.
34. Kikuchi, Yuta, Bouyrie, Yohan, Ohta, Michihiro, Suekuni, Koichiro, Aihara, Makoto, Takabatake, Toshiro, Vanadium-free colusites Cu26A2Sn6S32 (A = Nb, Ta) for environmentally friendly thermoelectrics, Journal of Materials Chemistry A, 4, 15207, 2016.09.
35. Suekuni Koichiro, Takabatake Toshiro, Research Update: Cu–S based synthetic minerals as efficient thermoelectric materials at medium temperatures, APL materials, 4, 104503, 2016.07.
36. Kim, Fiseong S., Suekuni, Koichiro, Nishiate, Hirotaka, Ohta, Michihiro, Tanaka, Hiromi I., Takabatake, Toshiro, Tuning the charge carrier density in the thermoelectric colusite, JOURNAL OF APPLIED PHYSICS, 10.1063/1.4948475, 119, 17, 2016.05.
37. Tanaka, Hiromi I., Suekuni, Koichiro, Umeo, Kazunori, Nagasaki, Toshiki, Sato, Hitoshi, Kutluk, Galif, Nishibori, Eiji, Kasai, Hidetaka, Takabatake, Toshiro, Metal-Semiconductor Transition Concomitant with a Structural Transformation in Tetrahedrite Cu12Sb4S13, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 10.7566/JPSJ.85.014703, 85, 1, 014703-1-014703-6, 2016.01.
38. Suzuki, Takashi, Goto, Hiroki, Ishii, Isao, Noguchi, Yoshihito, Kamikawa, Shuhei, Suekuni, Koichiro, Tanaka, Hiromi I., Takabatake, Toshiro, Elastic softening in the tetrahedrite Cu12Sb4S13, 20TH INTERNATIONAL CONFERENCE ON MAGNETISM, ICM 2015, 75, 443-446, 2015.12.
39. Chen, Y. X., Niitani, K., Izumi, J., Suekuni, K., Takabatake, T., Vertical Bridgman growth of thermoelectric clathrate Ba8Ga16Sn30 with a type-VIII structure, JOURNAL OF CRYSTAL GROWTH, 10.1016/j.jcrysgro.2014.06.035, 402, 312-318, 2014.09.
40. Suekuni, Koichiro, Kim, Fiseong S., Nishiate, Hirotaka, Ohta, Michihiro, Tanaka, Hiromi I., Takabatake, Toshiro, High-performance thermoelectric minerals: Colusites Cu26V2M6S32 (M = Ge, Sn), APPLIED PHYSICS LETTERS, 10.1063/1.4896998, 105, 13, 132107-1-132107-4, 2014.09.
41. Kim, C. M., Kim, S. H., Onimaru, T., Suekuni, K., Takabatake, T., Jung, M. H., Thermoelectric properties in Mn-doped Bi2Se3, CURRENT APPLIED PHYSICS, 10.1016/j.cap.2014.05.011, 14, 8, 1041-1044, 2014.08.
42. Suekuni, K., Kim, F. S., Takabatake, T., Tunable electronic properties and low thermal conductivity in synthetic colusites Cu26-xZnxV2M6S32 (x <= 4, M = Ge, Sn), JOURNAL OF APPLIED PHYSICS, 10.1063/1.4892593, 116, 6, 063706-1-063706-5, 2014.08.
43. Takabatake, Toshiro, Suekuni, Koichiro, Eiji, Kaneshita, Nakayama, Tsuneyoshi, Phonon-glass electron-crystal thermoelectric clathrates: Experiments and theory, REVIEWS OF MODERN PHYSICS, 10.1103/RevModPhys.86.669, 86, 2, 669-716, 2014.06.
44. Nishino, Shunsuke, Koyano, Mikio, Suekuni, Koichiro, Ohdaira, Keisuke, Development of a Thermal Conductivity Measurement System Using the 3 omega Method and Application to Thermoelectric Particles, JOURNAL OF ELECTRONIC MATERIALS, 10.1007/s11664-014-2993-9, 43, 6, 2151-2156, 2014.06.
45. Jood, Priyanka, Ohta, Michihiro, Nishiate, Hirotaka, Yamamoto, Atsushi, Lebedev, Oleg I., Berthebaud, David, Suekuni, Koichiro, Kunii, Masaru, Microstructural Control and Thermoelectric Properties of Misfit Layered Sulfides (LaS)(1+m)TS2 (T = Cr, Nb): The Natural Superlattice Systems, CHEMISTRY OF MATERIALS, 10.1021/cm5004559, 26, 8, 2684-2692, 2014.04.
46. Suekuni, K., Tomizawa, Y., Ozaki, T., Koyano, M., Systematic study of electronic and magnetic properties for Cu12-xTMxSb4S13 (TM=Mn, Fe, Co, Ni, and Zn) tetrahedrite, JOURNAL OF APPLIED PHYSICS, 10.1063/1.4871265, 115, 14, 143702-1-143702-5, 2014.04.
47. Onimaru, Takahiro, Tsutsui, Satoshi, Mizumaki, Masaichiro, Kawamura, Naomi, Ishimatsu, Naoki, Avila, Marcos A., Yamamoto, Shuhei, Yamane, Haruki, Suekuni, Koichiro, Umeo, Kazunori, Kume, Tetsuji, Nakano, Satoshi, Takabatake, Toshiro, Simultaneous Pressure-Induced Magnetic and Valence Transitions in Type-I Clathrate Eu8Ga16Ge30, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 10.7566/JPSJ.83.013701, 83, 1, 013701-1-013701-4, 2014.01.
48. Tou, Hideki, Sonoda, Kanto, Furumoto, Kazuya, Kotegawa, Hisashi, Suekuni, Koichiro, Avila, Marcos A., Takabatake, Toshiro, Strong Coupling of Rattling Phonon to Conduction Electrons in Semimetallic Type-I Clathrate Ba8Ga16Sn30, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 10.7566/JPSJ.82.114603, 82, 11, 114603-1-114603-7, 2013.11.
49. Iwamoto, K., Mori, T., Kajitani, S., Matsumoto, H., Toyota, N., Suekuni, K., Avila, M. A., Saiga, Y., Takabatake, T., Optical conductivity spectra of rattling phonons and charge carriers in the type-VIII clathrate Ba8Ga16Sn30, PHYSICAL REVIEW B, 10.1103/PhysRevB.88.104308, 88, 10, 104308-1-104308-9, 2013.09.
50. Do, Van Lam, Ariga, Tomoki, Takahashi, Kouhei, Suekuni, Koichiro, Koyano, Mikio, Percolation Conduction in Hybrid Thermoelectric Material Consisting of Bi0.88Sb0.12 and Barium Ferrite Particles, JOURNAL OF ELECTRONIC MATERIALS, 10.1007/s11664-012-2436-4, 42, 7, 2350-2355, 2013.07.
51. Suekuni, K., Tsuruta, K., Fukuoka, H., Koyano, M., Structural and thermoelectric properties of Cu6Fe4Sn12Se32 single crystal, JOURNAL OF ALLOYS AND COMPOUNDS, 10.1016/j.jallcom.2013.02.032, 564, 91-94, 2013.07.
52. Iwamoto, Kei, Kushibiki, Shunsuke, Honda, Hironori, Kajitani, Shuhei, Mori, Tatsuya, Matsumoto, Hideki, Toyota, Naoki, Suekuni, Koichiro, Avila, Marcos A., Takabatake, Toshiro, Anomalous Infrared Spectra of Hybridized Phonons in Type-I Clathrate Ba8Ga16Ge30, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 10.7566/JPSJ.82.024601, 82, 2, 024601-1-024601-7, 2013.02.
53. Kitagawa, Jiro, Kadoya, Yutaka, Suekuni, Koichiro, Avila, Marcos A., Takabatake, Toshiro, Characterization of Terahertz Absorption in Clathrate Compound by Compact Spectroscopic Chip, JAPANESE JOURNAL OF APPLIED PHYSICS, 10.7567/JJAP.52.028003, 52, 2, 028003-1-028003-2, 2013.02.
54. Suekuni, Koichiro, Tsuruta, Kojiro, Kunii, Masaru, Nishiate, Hirotaka, Nishibori, Eiji, Maki, Sachiko, Ohta, Michihiro, Yamamoto, Atsushi, Koyano, Mikio, High-performance thermoelectric mineral Cu12-xNixSb4S13 tetrahedrite, JOURNAL OF APPLIED PHYSICS, 10.1063/1.4789389, 113, 4, 043712-1-043712-5, 2013.01.
55. Saiga, Y., Suekuni, K., Du, B., Takabatake, T., Thermoelectric properties and structural instability of type-I clathrate Ba8Ga16Sn30 at high temperatures, SOLID STATE COMMUNICATIONS, 10.1016/j.ssc.2012.06.027, 152, 20, 1902-1905, 2012.10.
56. Suekuni, Koichiro, Kunii, Masaru, Nishiate, Hirotaka, Ohta, Michihiro, Yamamoto, Atsushi, Koyano, Mikio, Thermoelectric Properties of Selenospinel Cu6Fe4Sn12Se32, JOURNAL OF ELECTRONIC MATERIALS, 10.1007/s11664-011-1842-3, 41, 6, 1130-1133, 2012.06.
57. Koyano, Mikio, Tanaka, Junya, Suekuni, Koichiro, Ariga, Tomoki, Single-Crystal Growth of Bi-Sb-Te Thermoelectric Materials by Halide Chemical Vapor Transport Technique, JOURNAL OF ELECTRONIC MATERIALS, 10.1007/s11664-011-1849-9, 41, 6, 1317-1321, 2012.06.
58. Suekuni, Koichiro, Tsuruta, Kojiro, Ariga, Tomoki, Koyano, Mikio, Thermoelectric Properties of Mineral Tetrahedrites Cu10Tr2Sb4S13 with Low Thermal Conductivity, APPLIED PHYSICS EXPRESS, 10.1143/APEX.5.051201, 5, 5, 051201-1-051201-3, 2012.05.
59. Kono, Yasushi, Akai, Koji, Ohya, Nobuyuki, Saiga, Yuhta, Suekuni, Koichiro, Takabatake, Toshiro, Yamamoto, Setsuo, Electronic Structures and Thermoelectric Properties of Sb-Doped Type-VIII Clathrate Ba8Ga16Sn30, MATERIALS TRANSACTIONS, 10.2320/matertrans.E-M2012807, 53, 4, 636-640, 2012.04.
60. Ishii, Isao, Suetomi, Yasuhiko, Fujita, Takahiro K., Suekuni, Koichiro, Tanaka, Tomoo, Takabatake, Toshiro, Suzuki, Takashi, Avila, Marcos A., Lattice instability and elastic dispersion due to the rattling motion in the type-I clathrate Ba8Ga16Sn30, PHYSICAL REVIEW B, 10.1103/PhysRevB.85.085101, 85, 8, 085101-1-085101-7, 2012.02.
61. Thu, Tran V., Thanh, Pham D., Suekuni, Koichiro, Hai, Nguyen H., Mott, Derrick, Koyano, Mikio, Maenosono, Shinya, Synthesis of delafossite CuAlO2 p-type semiconductor with a nanoparticle-based Cu(I) acetate-loaded boehmite precursor, MATERIALS RESEARCH BULLETIN, 10.1016/j.materresbull.2011.07.047, 46, 11, 1819-1827, 2011.11.
62. Suzuki, Takashi, Okada, Chika, Suetomi, Yasuhiko, Fujita, Takahiro K., Ishii, Isao, Suekuni, Koichiro, Avila, Marcos A., Takabatake, Toshiro, Emergence of elastic softening in Sr8Ga16Si30-xGex with increasing Ge concentration, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 80, SA038-1-SA038-3, 2011.07.
63. Tou, H., Sonoda, K., Nishikawa, Y., Kotegawa, H., Suekuni, H., Onimaru, T., Takabatake, T., NMR studies of Ba8Ga16Sn30 clathrates, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 80, SA039-1-SA039-3, 2011.07.
64. Fukuoka, Hiroshi, Suekuni, Koichiro, Onimaru, Takahiro, Inumaru, Kei, High-Pressure Synthesis and Superconductivity of a New Binary Lanthanum Germanide LaGe3 with Triangular Ge-3 Cluster Units, INORGANIC CHEMISTRY, 10.1021/ic102077k, 50, 9, 3901-3906, 2011.05.
65. Kono, Yasushi, Ohya, Nobuyuki, Saiga, Yuhta, Suekuni, Koichiro, Takabatake, Toshiro, Akai, Koji, Yamamoto, Setsuo, Carrier Doping in the Type VIII Clathrate Ba8Ga16Sn30 Through Sb Substitution, JOURNAL OF ELECTRONIC MATERIALS, 10.1007/s11664-011-1590-4, 40, 5, 845-850, 2011.05.
66. Deng, S. K., Saiga, Y., Suekuni, K., Takabatake, T., Effect of Al Substitution on the Thermoelectric Properties of the Type VIII Clathrate Ba8Ga16Sn30, JOURNAL OF ELECTRONIC MATERIALS, 10.1007/s11664-011-1555-7, 40, 5, 1124-1128, 2011.05.
67. Suekuni, K., Tsuruta, K., Ariga, T., Koyano, M., Variable-range-hopping conduction and low thermal conductivity in chalcogenide spinel CuyFe4Sn12X32 (X = S, Se), JOURNAL OF APPLIED PHYSICS, 10.1063/1.3569624, 109, 8, 083709-1-083709-6, 2011.04.
68. Mori, T., Iwamoto, K., Kushibiki, S., Honda, H., Matsumoto, H., Toyota, N., Avila, M. A., Suekuni, K., Takabatake, T., Optical Conductivity Spectral Anomalies in the Off-Center Rattling System beta-Ba8Ga16Sn30, PHYSICAL REVIEW LETTERS, 10.1103/PhysRevLett.106.015501, 106, 1, 015501-1-015501-4, 2011.01.
69. Takasu, Y., Hasegawa, T., Ogita, N., Udagawa, M., Avila, M. A., Suekuni, K., Takabatake, T., Off-center rattling and cage vibration of the carrier-tuned type-I clathrate Ba8Ga16Ge30 studied by Raman scattering, PHYSICAL REVIEW B, 10.1103/PhysRevB.82.134302, 82, 13, 134302-1-134302-7, 2010.10.
70. Deng, Shukang, Saiga, Yuta, Suekuni, Koichiro, Takabatake, Toshiro, Enhancement of thermoelectric efficiency in type-VIII clathrate Ba8Ga16Sn30 by Al substitution for Ga, JOURNAL OF APPLIED PHYSICS, 10.1063/1.3490776, 108, 7, 073705-1-073705-4, 2010.10.
71. Saiga, Y., Suekuni, K., Deng, S. K., Yamamoto, T., Kono, Y., Ohya, N., Takabatake, T., Optimization of thermoelectric properties of type-VIII clathrate Ba8Ga16Sn30 by carrier tuning, JOURNAL OF ALLOYS AND COMPOUNDS, 10.1016/j.jallcom.2010.07.121, 507, 1, 1-5, 2010.09.
72. Kono, Yasushi, Ohya, Nobuyuki, Taguchi, Takashi, Suekuni, Koichiro, Takabatake, Toshiro, Yamamoto, Setsuo, Akai, Koji, First-principles study of type-I and type-VIII Ba8Ga16Sn30 clathrates, JOURNAL OF APPLIED PHYSICS, 10.1063/1.3437252, 107, 12, 123720-1-123720-6, 2010.06.
73. Suekuni, K., Takasu, Y., Hasegawa, T., Ogita, N., Udagawa, M., Avila, M. A., Takabatake, T., Off-center rattling modes and glasslike thermal conductivity in the type-I clathrate Ba8Ga16Sn30, PHYSICAL REVIEW B, 10.1103/PhysRevB.81.205207, 81, 20, 205207-1-205207-5, 2010.05.
74. Tanaka, T., Onimaru, T., Suekuni, K., Mano, S., Fukuoka, H., Yamanaka, S., Takabatake, T., Interplay between thermoelectric and structural properties of type-I clathrate K8Ga8Sn38 single crystals, PHYSICAL REVIEW B, 10.1103/PhysRevB.81.165110, 81, 16, 165110-1-165110-6, 2010.04.
75. Kozina, M., Bridges, F., Jiang, Y., Avila, M. A., Suekuni, K., Takabatake, T., Direct verification of Ga-Ga bond avoidance in the type-I clathrate Ba8Ga16Sn30 from its x-ray absorption fine structure, PHYSICAL REVIEW B, 10.1103/PhysRevB.80.212101, 80, 21, 212101-1-212101-4, 2009.12.
76. Suekuni, Koichiro, Tanaka, Tomoo, Yamamoto, Shuhei, Avila, Marcos A., Umeo, Kazunori, Takasu, Yuichi, Hasegawa, Takumi, Ogita, Norio, Udagawa, Masayuki, Takabatake, Toshiro, Off-Center Guest Vibrations and Their Effect on Lattice Thermal Conductivity in n- and p-Type beta-Ba8Ga16Sn30, JOURNAL OF ELECTRONIC MATERIALS, 10.1007/s11664-009-0686-6, 38, 7, 1516-1520, 2009.07.
77. Mori, T., Goshima, S., Iwamoto, K., Kushibiki, S., Matsumoto, H., Toyota, N., Suekuni, K., Avila, M. A., Takabatake, T., Hasegawa, T., Ogita, N., Udagawa, M., Optical conductivity of rattling phonons in type-I clathrate Ba8Ga16Ge30, PHYSICAL REVIEW B, 10.1103/PhysRevB.79.212301, 79, 21, 212301-1-212301-4, 2009.06.
78. Tang, Jun, Kumashiro, Ryotaro, Ju, Jing, Li, Zhaofei, Avila, Marcos A., Suekuni, Kouichirou, Takabatake, Toshiro, Guo, Fangzhun, Kobayashi, Keisuke, Tanigaki, Katsumi, p- and n-Type Ba8Ga16Ge30 studied by X-ray photoelectron spectroscopy, CHEMICAL PHYSICS LETTERS, 10.1016/j.cplett.2009.02.061, 472, 1-3, 60-64, 2009.04.
79. Tang, Jun, Rachi, Takeshi, Kumashiro, Ryotaro, Avila, Marcos A., Suekuni, Kouichirou, Takabatake, Toshiro, Guo, FangZhun, Kobayashi, Keisuke, Akai, Koji, Tanigaki, Katsumi, Energetics of endohedral atoms in type-I clathrates observed by soft x-ray spectroscopy, PHYSICAL REVIEW B, 10.1103/PhysRevB.78.085203, 78, 8, 085203-1-085203-6, 2008.08.
80. Suekuni, K., Avila, M. A., Umeo, K., Fukuoka, H., Yamanaka, S., Nakagawa, T., Takabatake, T., Simultaneous structure and carrier tuning of dimorphic clathrate Ba8Ga16Sn30, PHYSICAL REVIEW B, 10.1103/PhysRevB.77.235119, 77, 23, 235119-1-235119-8, 2008.06.
81. Takasu, Y., Hasegawa, T., Ogita, N., Udagawa, M., Avila, M. A., Suekuni, K., Takabatake, T., Off-center rattling and anisotropic expansion of type-I clathrates studied by Raman scattering, PHYSICAL REVIEW LETTERS, 10.1103/PhysRevLett.100.165503, 100, 16, 165503-1-165503-4, 2008.04.
82. Avila, M. A., Suekuni, K., Umeo, K., Fukuoka, H., Yamanaka, S., Takabatake, T., Ba(8)Ga(16)Sn(30) with type-I clathrate structure: Drastic suppression of heat conduction, APPLIED PHYSICS LETTERS, 10.1063/1.2831926, 92, 4, 041901-1-041901-3, 2008.01.
83. Suekuni, Kouichirou, Yamamoto, Shuhei, Avila, Marcos A., Takabatake, Toshiro, Universal relation between guest free space and lattice thermal conductivity reduction by anharmonic rattling in type-I clathrates, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 10.1143/JPSJS.77SA.61, 77, 61-66, 2008.01.
84. Udagawa, Masayuki, Hasegawa, Takumi, Takasu, Yuichi, Ogita, Norio, Suekuni, Koichiro, Avila, Marcos A., Takabatake, Toshiro, Ishikawa, Yoshikazu, Takeda, Naoya, Nemoto, Yuichi, Goto, Terutaka, Sugawara, Hitoshi, Kikuchi, Daisuke, Sato, Hideyuki, Sekine, Chihiro, Shirotani, Ichimin, Yamaura, Jun-Ichi, Nagao, Yohei, Hiroi, Zenji, Guest Ion Motion in Cage Structure Crystals Investigated by Raman Scattering, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 10.1143/JPSJS.77SA.142, 77, 142-147, 2008.01.
85. Takasu, Yuichi, Hasegawa, Takumi, Ogita, Norio, Udagawa, Masayuki, Avila, Marcos A., Suekuni, Koichiro, Takabatake, Toshiro, Raman Scattering of Type-I Clathrate Compounds, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 10.1143/JPSJS.77SA.254, 77, 254-256, 2008.01.
86. Ribeiro, R. A., Narazu, S., Suekuni, K., Avila, M. A., Takabatake, T., Low-temperature thermoelectric properties of Yb14MSb11 (M = Mn, Zn), JOURNAL OF PHYSICS-CONDENSED MATTER, 10.1088/0953-8984/19/37/376211, 19, 37, 376211-1-376211-6, 2007.09.
87. Suekuni, K., Avila, M. A., Umeo, K., Takabatake, T., Cage-size control of guest vibration and thermal conductivity in Sr8Ga16Si30-xGex, PHYSICAL REVIEW B, 10.1103/PhysRevB.75.195210, 75, 19, 195210-1-195210-6, 2007.05.
88. Takasu, Y., Hasegawa, T., Ogita, N., Udagawa, M., Avila, M. A., Suekuni, K., Ishii, I., Suzuki, T., Takabatake, T., Dynamical properties of guest ions in the type-I clathrate compounds X8Ga16Ge30 (X=Eu,Sr,Ba) investigated by Raman scattering, PHYSICAL REVIEW B, 10.1103/PhysRevB.74.174303, 74, 17, 174303-1-174303-5, 2006.11.
89. Avila, M. A., Suekuni, K., Umeo, K., Fukuoka, H., Takabatake, T., Glasslike versus crystalline thermal conductivity in carrier-tuned Ba8Ga16X30 clathrates (X=Ge,Sn), PHYSICAL REVIEW B, 10.1103/PhysRevB.74.125109, 74, 12, 125109-1-125109-8, 2006.09.
90. Avila, M. A., Suekuni, K., Umeo, K., Takabatake, T., Carrier-tuning of single-crystalline Ba8Ga16Ge30, PHYSICA B-CONDENSED MATTER, 10.1016/j.physb.2006.03.074, 383, 1, 124-125, 2006.08.
91. Avila, MA, Huo, D, Sakata, T, Suekuni, K, Takabatake, T, Tunable charge carriers and thermoelectricity of single-crystal Ba8Ga16Sn30, JOURNAL OF PHYSICS-CONDENSED MATTER, 10.1088/0953-8984/18/5/011, 18, 5, 1585-1592, 2006.02.
92. Umeo, K, Avila, MA, Sakata, T, Suekuni, K, Takabatake, T, Probing glasslike excitations in single-crystalline Sr8Ga16Ge30 by specific heat and thermal conductivity, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 10.1143/JPSJ.74.2145, 74, 8, 2145-2148, 2005.08.
93. Takasu, Y, Hasegawa, T, Ogita, N., Udagawa, M., Avila, M. A., Suekuni, K., Takabatake, T., Yamaguchi, T., Watanabe, T., Nemoto, Y., Goto, T., Hiroi, Z., Raman scattering study of the guest ion motion in caged crystals, ICT'06: XXV International Conference on Thermoelectrics, Proceedings, 33-35.
94. Takasu, Y., Ogita, N., Udagawa, M., Suekuni, K., Avila, M. A., Takabatake, T., Raman scattering of type-I clathrate compounds: A(8)Ga(16)Ge(30)(A = Eu, Sr, Ba) and Sr(8)Ga(16)Si(30-x)Ge(x), 12TH INTERNATIONAL CONFERENCE ON PHONON SCATTERING IN CONDENSED MATTER (PHONONS 2007), 10.1088/1742-6596/92/1/012151, 92, 012151-1-012151-4.
95. Suekuni, K., Yamamoto, S., Avila, M. A., Takabatake, T., Thermal conductivity and guest vibration in cage-size controlled Ba8In16Ge30-xMx (M=Si, Sn), PROCEEDINGS ICT 07: TWENTY-SIXTH INTERNATIONAL CONFERENCE ON THERMOELECTRICS, 238-240.
96. Narazu, S., Suekuni, K., Takabatake, T., Suzuki, K., Anno, H., Thermoelectric properties of double-filled skutterudites Ca1-xLaxFe4-yCoySb12, PROCEEDINGS ICT 07: TWENTY-SIXTH INTERNATIONAL CONFERENCE ON THERMOELECTRICS, 199-203.
97. Takasu, Y., Hasegawa, T., Ogita, N., Udagawa, M., Suekuni, K., Avila, M. A., Takabatake, T., Dynamical motion of a guest ion studied by Raman scattering and the lattice thermal conductivity in A(8)Ga(16)Si(30-x)Ge(x) (A = Ba, Sr), PROCEEDINGS ICT 07: TWENTY-SIXTH INTERNATIONAL CONFERENCE ON THERMOELECTRICS, 227-229.
98. Onimaru, Takahiro, Yamamoto, Shuhei, Avila, Marcos A., Suekuni, Koichiro, Takabatake, Toshiro, Multiple Ferromagnetic Structures in an Off-Center Rattling System Eu(8)Ga(16)Ge(30), INTERNATIONAL CONFERENCE ON MAGNETISM (ICM 2009), 10.1088/1742-6596/200/2/022044, 200, 022044-1-022044-4.
99. Watanabe, T., Moriyasu, T., Okamura, H., Suekuni, K., Onimaru, T., Takabatake, T., Kohmoto, T., Direct Observation of the Spatial and Temporal Dynamics of Thermal Diffusion in Clathrate Compounds, 2012 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO).
100. Iwamoto, K., Mori, T., Kushibiki, S., Honda, H., Matsumoto, H., Suekuni, K., Avila, M. A., Takabatake, T., Toyota, N., Optical conductivity of rattling phonons in type-I clathrates Ba8Ga16Ge30 and Ba8Ga16Sn30, Key Engineering Materials, 10.4028/www.scientific.net/KEM.508.341, 508, 341-346.
101. Christensen, Sebastian, Avila, Marcos A., Suekuni, Koichiro, Piltz, Ross, Takabatake, Toshiro, Christensen, Mogens, Combined X-ray and neutron diffraction study of vacancies and disorder in the dimorphic clathrate Ba8Ga16Sn30 of type I and VIII, DALTON TRANSACTIONS, 10.1039/c3dt51328a, 42, 41, 14766-14775.
102. Kim, Soohyun, Kim, Chungman, Hong, Yang-Ki, Onimaru, Takahiro, Suekuni, Koichiro, Takabatake, Toshiro, Jung, Myung-Hwa, Thermoelectric properties of Mn-doped Mg-Sb single crystals, JOURNAL OF MATERIALS CHEMISTRY A, 10.1039/c4ta02386b, 2, 31, 12311-12316.
103. Keiber, Trevor, Nast, Patrick, Medling, Scott, Bridges, Frank, Suekuni, Koichiro, Avila, Marcos A., Takabatake, Toshiro, Comparison of local distortions in Ba8Ga16X30 (X = Si, Ge, Sn): an EXAFS study, JOURNAL OF MATERIALS CHEMISTRY C, 10.1039/c5tc01641j, 3, 40, 10574-10582.
104. Takabatake, Toshiro, Suekuni, Koichiro, Clathrate-based Thermoelectrics, The Handbook of Materials Aspect of Thermoelectricity, Chapt. 6, pp. 219-236.