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論文一覧
三浦 峻（みうら しゅん） データ更新日：2024.04.12

助教　／　 システム情報科学研究院 電気システム工学部門


原著論文
1. Hiroshi Miyazaki, Masataka Iwakuma, Yuki Emori, Hiromasa Sasa, Koichi Yoshida, Seiki Sato, Shun Miura, Isamu Sagara, Yoshiaki Suzuki, Masayuki Konno, Hirokazu Hirai, Teruo Izumi, Fabrication and Test of a 400 kW-class Fully Superconducting Synchronous Motor Using REBCO Tape for an Electric Propulsion System, IEEE Transactions on Applied Superconductivity, 34, 5200506, 2024.08.
2. Masahiko Tsumori, Ryoto Yamasaki, Yuta Okade, Hiroshi Miyazaki, Shun Miura, Hiromasa Sasa, Koichi Yoshida, Masataka Iwakuma, Effectiveness of REBCO Trapezoidal Armature Coils Used in Superconducting Induction Motors, IEEE Transactions on Applied Superconductivity, 34, 5200206, 2024.08.
3. Atsushi Takashima, Hiroshi Miyazaki, Shun Miura, Koichi Yoshida, Seiki Sato, Hiromasa Sasa, Masataka Iwakuma, Current Distributions in Armature Coils Comprising Two Sizes of Racetrack Double-Pancakes with REBCO Striated Tapes, IEEE Transactions on Applied Superconductivity, 34, 5201605, 2024.08.
4. Ryoma Oishi, Kodai Jingami, Hiroshi Miyazaki, Masataka Iwakuma, Shun Miura, Hiromasa Sasa, Koichi Yoshida, Masanori Daibo, Shinji Fujita, Evaluation of the AC Loss Characteristics of Multifilamentary REBCO Tapes by the Mechanical Scratching of MgO Areas, IEEE Transactions on Applied Superconductivity, 34, 5901906, 2024.08.
5. Yuki Emori, Hiroshi Miyazaki, Shun Miura, Hiromasa Sasa, Masataka Iwakuma, Electromagnetic Design of a REBCO Four-Pole Full-Pitched Armature Coil Composed of Trapezoidal Windings for Fully Superconducting Synchronous Motors, IEEE Transactions on Applied Superconductivity, 34, 5201305, 2024.08.
6. Shun Miura, Asato Kobun, Yohei Masuda, Goki Kawasaki, Hiroshi Miyazaki,　Akifumi Kawagoe, Hiromasa Sasa, Koichi Yoshida, Seiki Sato, Masataka Iwakuma, Current Distribution Among Transposed Eight- and 16-Parallel REBa2Cu3Oy Wires in Single-Phase Armature Coils, IEEE Transactions on Applied Superconductivity, 10.1109/TASC.2024.3356436, 34, 3, 5201906, 2024.05.
7. Shun Miura, Kazuki Nakamura, Yohei Masuda, Goki Kawasaki, Hiroshi Miyazaki, Akifumi Kawagoe, Hiromasa Sasa, Koichi Yoshida, Seiki Sato, Masataka Iwakuma, Current Sharing Among Three-Strand Parallel Conductors Composed of REBCO Tapes in Three-Phase Armature Coil Conditions, IEEE Transactions on Applied Superconductivity, 34, 5200905, 2024.08, [URL].
8. S. Miura, A. Kobun, Y. Masuda, H. Miyazaki, A. Kawagoe, H. Sasa, K. Yoshida, S. Sato, M. Iwakuma, Development and assessment of simplified analytical method for current distribution among REBa2Cu3Oy parallel conductors in armature windings for fully superconducting rotating machines, Superconductor Science and Technology, 10.1088/1361-6668/acca4f, 36, 065007, 2023.05.
9. Asato Kobun, Yohei Masuda, Shun Miura, Hiroshi Miyazaki, Koichi Yoshida, Seiki Sato, Hiromasa Sasa, Masataka Iwakuma, Basic Concept for Uniform Current Distribution in Parallel Conductors by Introducing a Small Number of Transpositions in REBCO Armature Coils, IEEE Transactions on Applied Superconductivity, 10.1109/TASC.2023.3242621, 33, 5, 5200406, 2023.08.
10. Shun Miura, Asato Kobun, Yohei Masuda, Kazuki Nakamura, Hiroshi Miyazaki, Akifumi Kawagoe, Hiromasa Sasa, Koichi Yoshida, Seiki Sato, Masataka Iwakuma, Current Sharing Among Transposed Three-Parallel REBa2Cu3Oy Tapes in Single-Phase Armature Coils, IEEE Transactions on Applied Superconductivity, 10.1109/TASC.2023.3241824, 33, 5, 5200306, 2023.08.
11. Atsushi Takashima, Yuki Onamyuda, Asato Kobun, Hiroshi Miyazaki, Akifumi Kawagoe, Shun Miura, Koichi Yoshida, Seiki Sato, Hiromasa Sasa, Masataka Iwakuma, Current Distribution of Armature Coils Combining Two Different Sizes of REBCO Racetrack Double Pancakes, IEEE Transactions on Applied Superconductivity, 10.1109/TASC.2023.3241822, 33, 5, 4600905, 2023.08.
12. Kaito Noda, Hiromasa Sasa, Hiroshi Miyazaki, Shun Miura, Takashi Yoshida, Teruyoshi Sasayama, Masataka Iwakuma, Akifumi　Kawagoe, Teruo Izumi, Masayuki Konno, Yuichiro Sasamori, Hirokazu Honda, Yoshiji Hase　and Masao Shutoh, Numerical simulation of a high-power density 10 MW REBCO superconducting synchronous generator cooled by sub-cooled LN2 for low AC loss, Journal of Physics: Conference Series, 2323, 012037, 2022.09.
13. Yuki Omanyuda , Hiromasa Sasa , Hiroshi Miyazaki , Shun Miura , and Masataka Iwakuma, Experimental Evaluation of Current Distribution in Three-Strand Transposed Parallel Conductors Composed of REBCO Superconducting Tapes, IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 32, 6, 6601105, 2022.09.
14. Hiromasa Sasa, Shun Miura, Hiroshi Miyazaki, Teruyoshi Sasayama, Takashi Yoshida, Kaoru Yamamoto, Masataka Iwakuma, Yoshiji Hase, Yuichiro Sasamori, Hirokazu Honda, Masayuki Konno, and Teruo Izumi, Thermal-Electromagnetic Coupled Analysis Considering AC Losses in REBCO Windings at 65 K of 10 MW Fully-Superconducting Synchronous Generators for Electric Aircraft, IEEE Transactions on Applied Superconductivity, 10.1109/TASC.2022.3160660, 32, 6, 5201806, 2022.09.
15. Yuta Okade, Hiroshi Miyazaki, Hiromasa Sasa, Koichi Yoshida, Shun Miura, Teruyoshi Sasayama, Takashi Yoshida, Akifumi Kawagoe, and Masataka Iwakuma, REBCO Trapezoidal Armature Windings for Superconducting Induction Motor, IEEE Transactions on Applied Superconductivity, 10.1109/TASC.2022.3160146, 32, 6, 5201706, 2022.09.
16. Sasa, Hiromasa; Iwakuma, Masataka; Yoshida, Koichi; Sato, Seiki; Sasayama, Teruyoshi; Yoshida, Takashi; Yamamoto, Kaoru; Miura, Shun; Kawagoe, Akifumi; Izumi, Teruo; Tomioka, Akira; Konno, Masayuki; Sasamori, Yuichiro; Honda, Hirokazu; Hase, Yoshiji; Syutoh, Masao; Lee, Sergey; Hasuo, Shinya; Nakamura, Miyuki; Hasegawa, Takayo; Aoki, Yuhji; Umeno, Takahiro, Experimental Evaluation of 1 kW-class Prototype REBCO Fully Superconducting Synchronous Motor Cooled by Subcooled Liquid Nitrogen for E-Aircraft, IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 10.1109/TASC.2021.3055452, 31, 5, 2021.08.
17. Sasa, Hiromasa; Miura, Shun; Iwakuma, Masataka; Izumi, Teruo; Machi, Takato; Ibi, Akira, Estimation Method for AC Loss of Perpendicularly Stacked REBa(2)Cu(3)Oy Superconducting Tapes under Magnetic Field, PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 10.1016/j.physc.2020.1353801, 580, 2021.01.
18. Omanyuda, Yuki; Miura, Shun; Iwakuma, Masataka, Additional AC Loss Properties of Three-Strand Transposed Parallel Conductors Composed of REBa2Cu3Oy Tapes, IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 10.1109/TASC.2021.3062792, 31, 5, 2021.08.
19. H Sasa, G Kawasaki, M Iwakuma, S Miura, T Izumi, T Machi, A Ibi, Dependences of AC Loss in Stacked REBa2Cu3Oy Superconducting Tapes on the Interval among Tapes under Perpendicular Magnetic Field, Journal of Physics: Conf. Series, 1293, 012037, 2019.06.
20. M Komiya, T Aikawa, K Yoshida, S Miura, M Iwakuma, T Yoshida, T Sasayama, A Tomioka, M Konno, T Izumi, Numerical analysis on the influence of armature winding configuration on AC loss of 10 MW fully superconducting generators of electric aircrafts, Journal of Physics: Conf. Series, 1293, 012074, 2019.06.
21. Masataka Komiya, Ryota Sugouchi, Hiromasa Sasa, Shun Miura, Masataka Iwakuma, Takashi Yoshida, Teruyoshi Sasayama, Kaoru Yamamoto, Akira Tomioka, Masayuki Konno, Teruo Izumi, Conceptual Design and Numerical Analysis of 10 MW Fully Superconducting Synchronous Generators Installed with a Novel Casing Structure, IEEE Transactions on Applied Superconductivity, 30, 4, 5206607, 2020.06.
22. Shun Miura, Masataka Iwakuma, Teruo Izumi, Lightweight Design of Tens-MW Fully-Superconducting Wind Turbine Generators with High-Performance REBa2Cu3Oy Wires, IEEE Transactions on Applied Superconductivity, 10.1109/TASC.2020.2979157, 30, 4, 2020.06, [URL], 15 MW-class Direct-drive fully-superconducting generators for offshore floating wind turbine generators were conceptually designed. High-performance EuBa2Cu3Oy (EuBCO) superconducting wires with a large in-field critical current were employed, which can reduce the wire length of the generators. The design study showed good electromagnetic properties: high efficiency of 96.5%, and a low synchronous reactance of 0.4 p.u. The total weight of the superconducting generators including support structures was assumed as ∼98 tons, which is much lighter than partially-superconducting generators and conventional generators. Furthermore, our superconducting generator satisfied the cost requirement due to employing high-performance EuBCO wires and reducing field winding length by a unique casing structure. In conclusion, the fully-superconducting generators have a great advantage, especially for a tens-MW wind turbine system..
23. Koichiro Ozaki, Yuma Doi, Koichi Yoshida, Shun Miura, Teruyoshi Sasayama, Takashi Yoshida, Kaoru Yamamoto, Masataka Iwakuma, Akifumi Kawagoe, Akira Tomioka, Masayuki Konno, Teruo Izumi, Conceptual Design of Superconducting Induction Motors Using REBa2Cu3Oy Superconducting Tapes for Electric Aircraft, IEEE Transactions on Applied Superconductivity, 10.1109/TASC.2020.2971671, 30, 4, 2020.06, [URL], High power density motors are required for electric propulsion aircrafts. The highest power density of the conventional motor is reported as 5.2 kW/kg up to now. Superconducting rotating machines have a potential to realize higher power density due to its high current density and a large magnetic field property. In this study, the induction motor with air-cored superconducting armature windings was conceptually designed. The output power range was 3 to 6 MW and the output power density aimed to be over 20 kW/kg. The armature voltage should be below kV-class and joule loss below 122 kW. The target efficiency was over 95%. The electromagnetic design and analysis were carried out by JMAG Designer. The number of magnetic poles and operating temperatures were set as two poles and liquid hydrogen temperature of 20 K, respectively. The parameter was power frequency in the range of 100-250 Hz. As a result, all the requirements were satisfied when the power frequency was 130 Hz. The feasibility of the MW-class superconducting induction motor was investigated, and in conclusion, the superconducting induction motor can be applied to the aircraft propulsion system..
24. Ryota Sugouchi, Hirokazu Honda, Yoshiji Hase, Masao Shuto, Masayuki Konno, Teruo Izumi, Masataka Komiya, Shun Miura, Masataka Iwakuma, Koichi Yoshida, Teruyoshi Sasayama, Takashi Yoshida, Kaoru Yamamoto, Yuichiro Sasamori, Conceptual Design and Electromagnetic Analysis of 2 MW Fully Superconducting Synchronous Motors with Superconducting Magnetic Shields for Turbo-Electric Propulsion System, IEEE Transactions on Applied Superconductivity, 10.1109/TASC.2020.2974705, 30, 4, 2020.06, [URL], With air traffic predicted to increase in the future, CO2 emission must be decreased to prevent global warming. Our research group previously proposed electric propulsion systems based on superconducting technology, which is promising for reducing emissions. In this study, propulsive 2 MW fully superconducting motors were conceptually designed. At operating temperatures of 20 and 64 K, we observed the influence of the superconducting magnetic shield on the electromagnetic properties, especially the output power density, AC loss, and efficiency. The superconducting magnetic shield can reduce leakage magnetic field to the outside of the motor by inducing a current, and the shield is reproduced with a conductor of extremely high conductivity for simplicity in electromagnetic analysis. As a result, at an operating temperature of 20 K, the superconducting motors with the superconducting magnetic shields showed a high power density greater than 40 kW/kg and high efficiency of 99.7%. Even at an operating temperature of 64 K, the motors with the superconducting shield showed a power density and efficiency of 20 kW/kg and 99.4%, respectively..
25. Fumiya Nakamura, Masataka Iwakuma, Shun Miura, Kohichi Yoshida, Akira Tomioka, Msayuki Konno, Numerical analysis of current-limiting cooperation of a 20 mva superconducting transformer and cable, IEEE Transactions on Applied Superconductivity, 10.1109/TASC.2019.2909236, 29, 5, 2019.08, [URL], In a previous study, we developed a 66/6.9 kV-2 MVA REBa2Cu3Oy (REBCO) superconducting transformer with a current-limiting function that was cooled with subcooled liquid nitrogen at 65 K. By considering the flux-flow state, it is possible to quantitatively explain the behavior of REBCO superconducting transformers and cables subjected to a sudden short circuit. Our goal was to demonstrate that limiting an excess fault current to triple the rated current after 0.2 s (while maintaining a superconducting state) was possible with the cooperation of superconducting transformers and cables. For that purpose, a numerical analysis was performed by coupling thermal equations and circuit equations. Consequently, the numerical analysis demonstrated that limiting the excess fault current to triple the rated current after 0.2 s can be achieved by adjusting the thickness of the stabilizing copper layer of REBCO superconducting tapes and the length and critical current, Ic, of the superconducting cable. Through these simulations, the balance of Ic and thickness of copper layers was shown to be important in limiting overcurrent and normal transition rates of the superconducting winding of the transformer and cable..
26. Masataka Komiya, Takuya Aikawa, Hiromasa Sasa, Shun Miura, Masataka Iwakuma, Takashi Yoshida, Teruyoshi Sasayama, Akira Tomioka, Masayuki Konno, Teruo Izumi, Design study of 10 mw rebco fully superconducting synchronous generator for electric aircraft, IEEE Transactions on Applied Superconductivity, 10.1109/TASC.2019.2906655, 29, 5, 2019.08, [URL], Future aircraft are expected to have low noise pollution, low emission, and low fuel consumption. A fully turbo-electric propulsion system was proposed by NASA with these aims. The advantages of fully superconducting rotating machines are their weight and efficiency, owing to a high current density resulting in no iron core and no joule heat. In this paper, 10-MW fully superconducting generators with REBa2Cu3Oy (RE: Rare Earth, Y, Gd, Eu, and others, REBCO) superconducting tapes were studied in relation to their output power density and efficiency. The target output power density is over 20 kW/kg. Fully superconducting generators of 10 MW were designed, then a numerical simulation of the rated operation was conducted. The ac loss of the superconducting windings, iron loss of the yoke, total efficiency, dry weight, and output power density were evaluated, and their dependence on the operating temperature and the synchronous rotating speed were investigated. Here laser-scribing of the wires into a multifilamentary structure and transposed parallel conductors were introduced for ac loss reduction and current capacity enhancement. Consequently, the efficiency reached 99.2% in the case where the REBCO superconducting tapes were scribed into a 10-filament structure. The best model achieved a power density of 26.7 kW/kg. The iron yoke accounts for approximately half the total weight of all the models. The result suggests that the development of superconducting shields brings significant improvement to the output power density..
27. Yuji Tsuchiya, Junya Akita, Yusuke Ichino, Shun Miura, Yutaka Yoshida, In-Field Transport Properties at Grain Boundaries in BaHfO
3
-doped SmBa
2
Cu
3
O
y
Bicrystal Films at Low Temperatures, IEEE Transactions on Applied Superconductivity, 10.1109/TASC.2019.2903469, 29, 5, 2019.08, [URL], Higherature superconducting REBCO tapes are attractive for their high critical current density. J
c
in the REBCO film is suppressed under magnetic fields and by grain boundaries. Our group has reported that artificial pinning centers (APC) enhance the J
c
at the grain boundaries in the REBCO films at the liquid nitrogen temperature of 77 K. In this study, we have extended our previous work to a lower temperature since the usage of the REBCO tapes at a lower temperature and a high magnetic field is a recent development trend. Transport characteristics at grain boundaries in the REBCO films with and without APC are investigated at temperatures down to 4.2 K and at magnetic fields up to 9 T. The results show that the introduction of the APCs is effective to enhance the J
c
at the grain boundaries at low temperatures and at the magnetic fields, especially around the matching field where the density of the APC is equal to that of vortices..
28. Shintaro Sagawa, Shun Miura, Masataka Iwakuma, Yusuke Fukumoto, Koichi Yoshida, Seiki Sato, Teruo Izumi, Theoretical Investigation of Current-Sharing Properties of Three-Strand Parallel Conductors Composed of REBa
2
Cu
3
O
y
Superconducting Tapes, IEEE Transactions on Applied Superconductivity, 10.1109/TASC.2019.2895900, 29, 5, 2019.08, [URL], For nuclear magnetic resonance superconducting magnets wound with REBa
2
Cu
3
O
y
(REBCO, where RE = rare earth elements such as Y, Gd, Eu, and so on) superconducting tapes, the current capacity of the tapes needs to be enhanced from the viewpoint of magnet protection. Thus, the introduction of the configuration of parallel conductors was proposed. The constituent tapes should be insulated and transposed for low ac loss and uniform current sharing among the tapes. However, when the tapes have different values of critical current, I
c
, and their n-values, the tapes will not have uniform transport currents. In this paper, the current-sharing properties of three-strand parallel conductors composed of REBCO tapes, which were wound into coils, were theoretically investigated by accounting for the spatial distribution of the magnetic field, i.e., magnetic field and field angular dependences of I
c
. Here, it was assumed that the I-V characteristics are expressed by the n-value model. Equivalent circuit equations were derived and numerically solved. As a result, it was revealed that at a frequency higher than 0.01 Hz, the current flow is almost uniform even if there is a variation of 10% in I
c
and the n-value among the tapes. On the other hand, in the case of dc, the current sharing depends on the dispersion of I
c
and the n-value. In this paper, a simple solution for the control of the contact resistance at the terminals among the strands was proposed..
29. Shun Miura, Soichiro Oki, Takuma Furukawa, Masataka Iwakuma, Experimental Validation of Theoretical Expressions on Additional AC Loss of Two-Strand Parallel Conductors Composed of REBa
2
Cu
3
O
y
Tapes via Pick-Up-Coil Method, IEEE Transactions on Applied Superconductivity, 10.1109/TASC.2019.2895496, 29, 5, 2019.08, [URL], By a pick-up-coil method, the additional ac loss due to the formation of two-strand parallel conductors consisting of REBa
2
Cu
3
O
y
(REBCO, RE = rare earth) superconducting tapes was experimentally investigated. We recently improved the theoretical expression of the additional ac loss assuming that the voltage-current characteristics are expressed by the n-value model. The objective of this study is to prove the validity of the improved theoretical expression by experiment. The two insulated REBCO strands were cowound into a one-layer solenoidal coil. A uniform external magnetic field was applied in the axial direction of the sample coil. The additional ac losses were measured by the pick-up-coil method in sinusoidal ac magnetic fields whose maximum amplitude and frequency are 0.1 T and 10 Hz, respectively. The observed additional ac losses corresponded with the theoretical prediction. Therefore, it was concluded that the improved theoretical expression is more accurate than the previous one. At high-frequency regions, the observed additional ac losses slightly deviated from the theoretical predictions..
30. H. Sasa, T. Ito, Masataka Iwakuma, Shun Miura, T. Izumi, T. MacHi, A. Ibi, AC Loss Property of Stacked REBCO Superconducting Multifilamentary Tapes under Perpendicular Magnetic Field, 30th International Symposium on Superconductivity, ISS 2017
Journal of Physics: Conference Series, 10.1088/1742-6596/1054/1/012037, 1054, 1, 2018.07, [URL], For AC applications of high-temperature superconductors, such as REBa2Cu3O y (REBCO, RE = rare earth) superconducting tapes, an AC loss is a great part of total heat load of cooling systems. In the case of conduction cooling, it may cause a serious temperature rise of the superconducting systems. Therefore, it is very important to reduce the AC loss in superconducting windings and grasp its properties under various conditions. For AC loss reduction, REBCO tapes should be scribed into a multifilamentary structure by the laser-scribing technique. In this study, AC loss properties in the non-scribed and scribed tapes were investigated, especially for B m p, where B p is the breaking point of the AC loss curve and corresponds to the penetration field where the magnetic flux penetrates to the center of the tape or filaments. Further, the dependences of B p on the number of stacking tapes and filaments were investigated from the viewpoint of demagnetization effect. It was cleared that the AC loss for B m p decrease and B p increase with increasing number of stacked tapes..
31. Y. Ichino, N. Shimazaki, S. Miura, Y. Tsuchiya, Y. Yoshida, Surface diffusion constants and supersaturations in SmBCO films prepared by pulsed laser deposition method, IEEE Transactions on Applied Superconductivity, 28, 4, 7500304, 2018.06.
32. S. Miura, Y. Tsuchiya, Y. Yoshida, Y. Ichino, S. Awaji, A. Ichinose, K. Matsumoto, A. Ibi, T. Izumi, M. Iwakuma, Improved Flux Pinning for High Field Applications in BaHfO3-doped SmBa2Cu3Oy Coated Conductors with High Density of Random Pinning Centers Induced by BaHfO3 Nanorods, IEEE Transactions on Applied Superconductivity, 28, 4, 8000606, 2018.06.
33. S. Fukuda, K. Yun, M. Iwakuma, S. Miura, S. Sato, K. Yoshida, A. Tomioka, M. Konno, T. Izumi, Design Study of 2 MW Fully Superconducting Synchronous Motors, IEEE Transactions on Applied Superconductivity, 28, 4, 5207806, 2018.06.
34. T. Ito, M. Iwakuma, S. Miura, T. Izumi, K. Adachi, T. Machi, A. Ibi, Difference of AC Losses between non-striated and striated Tape and Applicability of Temperature Scaling Law to stacked striated Tape
, IEEE Transactions on Applied Superconductivity, 28, 3, 8200505, 2018.04.
35. S. Oki, S. Miura, M. Iwakuma, Theoretical Analysis of Additional AC Loss Properties of Two-Strand Transposed Parallel Conductors Composed of REBCO Superconducting Tapes
, IEEE Transactions on Applied Superconductivity, 28, 3, 8201005, 2018.04.
36. Satoshi Awaji, Yuji Tsuchiya, Shun Miura, Yusuke Ichino, Yutaka Yoshida, Kaname Matsumoto, C-axis correlated pinning mechanism in vortex liquid and solid phases for Sm123 film with well-aligned BaHfO3 nanorods, Superconductor Science and Technology, 10.1088/1361-6668/aa8d10, 30, 11, 2017.10, [URL], Nanorods, which are nano-scaled columnar-shape precipitates, have recently been used to improve critical current density J c in magnetic fields for REBa2Cu3Oy (RE123, RE: rare earth element) high temperature superconducting tapes/films. However, the flux pinning mechanism of the nanorod is not clear yet. We investigated the J c and resistivity ρ properties in detail and discussed the flux pinning properties on the basis of the flux pinning state diagram for high-quality Sm123 films with well-aligned 5.6 vol% BaHfO3 nanorods. Plateaus were observed in the field dependence of J c and ρ at high temperatures above the delocalization temperature. This suggests that nanorod pinning becomes effective in the vortex liquid phase and it grows up when the temperature decreases toward the delocalization temperature. In the 'many-nanorod' state in the high temperature region above the delocalization temperature, double peaks in the F p curves appear due to the coexistence of nanorod pinning and random pinning. At low temperatures below 70 K, however, the well-scaled F p curves at low fields and temperature dependent (non-scaled) normalized F p curves are observed. From detailed analysis using the cooperation model of the random and the correlated pinning centers, we found that nanorod pinning is dominant below the matching field and the cooperation between nanorod pinning and random pinning determines the high field J c properties above the matching field..
37. Yuji Tsuchiya, Shun MIURA, Satoshi Awaji, Yusuke Ichino, Kaname Matsumoto, Teruo Izumi, Kazuo Watanabe, Yutaka Yoshida, Flux pinning landscape up to 25T in SmBa2Cu3Oy films with BaHfO3 nanorods fabricated by low-temperature growth technique, Supercond. Sci. Technol., 30, 104004, 2017.09.
38. Shun MIURA, Yutaka Yoshida, Yuji Tsuchiya, Yusuke Ichino, Satoshi Awaji, Ataru Ichinose, Kaname Matsumoto, Akira Ibi, Teruo Izumi, Masataka Iwakuma, Strongly enhanced irreversibility field and flux pinning force density in SmBa2Cu3Oy-coated conductors with well-aligned BaHfO3 nanorods, Applied Physics Express, 10, 103101, 2017.09.
39. Yutaka Yoshida, Shun MIURA, Yuji Tsuchiya, Yusuke Ichino, Satoshi Awaji, Kaname Matsumoto, Ataru Ichinose, Approaches in controllable generation of artificial pinning center in REBa2Cu3Oy-coated conductor for high-flux pinning, Supercond. Sci. Technol., 30, 104002, 2017.08.
40. Shun MIURA, Yuji Tsuchiya, Yutaka Yoshida, Yusuke Ichino, Satoshi Awaji, Kaname Matsumoto, Akira Ibi, Teruo Izumi, Strong flux pinning at 4.2 K in SmBa2Cu3Oy coated conductors with BaHfO3 nanorods controlled by low growth temperature, Supercond. Sci. Technol., 30, 084009 - 1-084009 - 9, 2017.07.
41. Shun MIURA, Yusuke Ichino, Yutaka Yoshida, Ataru Ichinose, Akihiro Tsuruta, Vortex Pinning Properties at Grain Boundary in SmBa2Cu3Oy Superconducting Films with BaHfO3 Nano-rods Controlled via Low-Temperature Growth, IEEE Transactions on Applied Superconductivity, 27, 8001505, 2017.06.
42. Yusuke Ichino, Yutaka Yoshida, Shun MIURA, Three-dimensional Monte Carlo simulation of nano-rods self-organization in REBa2Cu3Oy thin films grown by vapor phase epitaxy, Japanese Journal of Applied Physic, 56, 015601, 2017.01.
43. Yuji Tsuchiya, Satoshi Awaji, Kazuo Watanabe, Shun MIURA, Yusuke Ichino, Yutaka Yoshida, Kaname Matsumoto, Delocalization of vortex in SmBa2Cu3O7-δ superconducting films with BaHfO3 nano-rods, Journal of Applied Physics, 120, 103902, 2016.09.
44. Shun MIURA, Yutaka Yoshida, Yusuke Ichino, Yuya Doki, Akira Ibi, Teruo Izumi, Takeharu Kato, Flux pinning properties in BaHfO3-doped SmBa2Cu3Oy films on metallic substrates fabricated with low temperature growth, IEEE Transactions on Applied Superconductivity, 26, 8000105, 2016.06.
45. 一瀬 中, 三浦 峻, 杉原 和樹, 鶴田 彰宏, 一野 祐亮, 吉田 隆, 淡路 智, 松本 要, 微細組織制御による超伝導膜の臨界電流特性制御, 日本金属学会誌, 80, 420-427, 2016.05.
46. Shun MIURA, Yutaka Yoshida, Yusuke Ichino, Qianyu Xu, Kaname Matsumoto, Ataru Ichinose, Satoshi Awaji, Improvement in Jc performance below liquid nitrogen temperature for SmBa2Cu3Oy superconducting films with BaHfO3 nano-rods controlled by low-temperature growth, APL Materials, 4, 016102, 2016.01.
47. Shun MIURA, Yutaka Yoshida, Yusuke Ichino, Akihiro Tsuruta, Kaname Matsumoto, Ataru Ichinose, Satoshi Awaji, Vortex pinning at low temperature under high magnetic field in SmBa2Cu3Oy superconducting films with high number density and small size of BaHfO3 nano-rods, Superconductor Science and Technology, 28, 114006, 2015.10.
48. Shun MIURA, Yutaka Yoshida, Yusuke Ichino, Akihiro Tsuruta, Kaname Matsumoto, Ataru Ichinose, Satoshi Awaji, Superconducting properties in SmBa2Cu3Oy films with high density of BaHfO3 nano-rods fabricated with a seed layer, IEEE Transactions on Applied Superconductivity, 25, 6604904, 2015.06.
49. Akihiro Tsuruta, Yutaka Yoshida, Yusuke Ichino, Shun MIURA, Ataru Ichinose, Kaname Matsumoto, Satoshi Awaji, Magnetic field of BG-VG transition depending on the nanorods shape in BaHfO3-doped SmBa2Cu3Oy films, IEEE Transactions on Applied Superconductivity, 25, 6602904, 2015.06.
50. Yusuke Ichino, Akihiro Tsuruta, Shun MIURA, Yutaka Yoshida, Masateru Yoshizumi, Teruo Izumi, Determinant for self-organization of BaMO3 nanorods included in vapor-phase-grown REBa2Cu3Oy films, IEEE Transactions on Applied Superconductivity, 25, 6604506, 2015.06.
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