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Journal Articles

Local structure study of the iron-based systems of BaFe$$_2$$As$$_2$$ and LiFeAs by X-ray PDF and XAFS analyses

Li, S.*; Toyoda, Masayuki*; Kobayashi, Yoshiaki*; Ito, Masayuki*; Ikeuchi, Kazuhiko*; Yoneda, Yasuhiro; Otani, Akira*; Matsumura, Daiju; Asano, Shun*; Mizuki, Junichiro*; et al.

Physica C, 555, p.45 - 53, 2018/12

 Times Cited Count:0 Percentile:100(Physics, Applied)

${it T}$-dependence of local distortions in BaFe$$_2$$As$$_2$$ and LiFeAs by X-ray PDF and XAFS methods. Although PDF data exhibit anomaly at the structure transition temperature, EXAFS data exhibit no anomaly. Data supporting the local orthorhombicity at 300 K in the tetragonal phase for BaFe$$_2$$As$$_2$$. Arguments on the origins of the 4-fold symmetry breaking in the ground average structure of the tetragonal phase.

Journal Articles

Ce substitution and reduction annealing effects on electronic states in Pr$$_{2-x}$$Ce$$_x$$CuO$$_4$$ studied by Cu $$K$$-edge X-ray absorption spectroscopy

Asano, Shun*; Ishii, Kenji*; Matsumura, Daiju; Tsuji, Takuya; Ina, Toshiaki*; Suzuki, Kensuke*; Fujita, Masaki*

Journal of the Physical Society of Japan, 87(9), p.094710_1 - 094710_5, 2018/09

 Times Cited Count:1 Percentile:65.99(Physics, Multidisciplinary)

Journal Articles

Reduction and oxidation annealing effects on Cu $$K$$-edge XAFS for electron-doped cuprate superconductors

Asano, Shun*; Suzuki, Kensuke*; Matsumura, Daiju; Ishii, Kenji*; Ina, Toshiaki*; Fujita, Masaki*

Journal of Physics; Conference Series, 969, p.012051_1 - 012051_5, 2018/04

 Times Cited Count:1 Percentile:14.78

Journal Articles

Evidence for momentum-dependent heavy fermionic electronic structures; Soft X-ray ARPES for the superconductor CeNi$$_{2}$$Ge$$_{2}$$ in the normal state

Nakatani, Yasuhiro*; Aratani, Hidekazu*; Fujiwara, Hidenori*; Mori, Takeo*; Tsuruta, Atsushi*; Tachibana, Shoichi*; Yamaguchi, Takashi*; Kiss, Takayuki*; Yamasaki, Atsushi*; Yasui, Akira*; et al.

Physical Review B, 97(11), p.115160_1 - 115160_7, 2018/03

AA2018-0003.pdf:1.65MB

 Times Cited Count:1 Percentile:77.37(Materials Science, Multidisciplinary)

Journal Articles

Resonant inelastic X-ray scattering study of entangled spin-orbital excitations in superconducting PrFeAsO$$_{0.7}$$

Nomura, Takuji*; Harada, Yoshihisa*; Niwa, Hideharu*; Ishii, Kenji*; Ishikado, Motoyuki*; Shamoto, Shinichi; Jarrige, I.*

Physical Review B, 94(3), p.035134_1 - 035134_9, 2016/07

 Times Cited Count:5 Percentile:56.07(Materials Science, Multidisciplinary)

Low-energy electron excitation spectra were measured on a single crystal of a typical iron-based superconductor PrFeAsO$$_{0.7}$$ using resonant inelastic X-ray scattering (RIXS) at the Fe-$$L_{3}$$ edge.

Journal Articles

Flux pinning properties in GdBCO coated conductors containing columnar defects with splay plane parallel to current direction

Furuki, Yuichi*; Sueyoshi, Tetsuro*; Kai, Takashi*; Iwanaga, Yasuya*; Fujiyoshi, Takanori*; Ishikawa, Norito

Physica C, 518, p.58 - 62, 2015/11

 Times Cited Count:3 Percentile:76.81(Physics, Applied)

In order to reveal the influence of crossing angle of one-dimensional pinning centers on angular dependence of critical current density Jc, heavy-ion irradiation was performed to introduce columnar defects (CDs) crossing relative to the c-axis into GdBCO coated conductors, where the splay plane consisting of the two directions of CDs is parallel to the current flow direction. For the sample containing CDs with 15$$^{circ}$$, a single and sharp peak was observed around B$$||$$c in the angular dependence of Jc. When the crossing angle was extended to 45$$^{circ}$$, the single Jc-peak became broader, which was a gently-sloping mountain-like shape centered at B$$||$$c. For 75$$^{circ}$$, on the other hand, a quite different behaviour of Jc from the other irradiated samples was observed, which was analogous to the angular dependence of Jc typical of three dimensional pinning centers.

Journal Articles

Influence of discontinuous columnar defects on flux pinning properties in GdBCO coated conductors

Sueyoshi, Tetsuro*; Kotaki, Tetsuya*; Furuki, Yuichi*; Uraguchi, Yusei*; Kai, Takashi*; Fujiyoshi, Takanori*; Shimada, Yusuke*; Yasuda, Kazuhiro*; Ishikawa, Norito

IEEE Transactions on Applied Superconductivity, 25(3), p.6603004_1 - 6603004_4, 2015/06

 Times Cited Count:5 Percentile:56.49(Engineering, Electrical & Electronic)

To investigate the effect of discontinuity of 1-D pinning centers on the flux pinning in a wide range of magnetic field directions, discontinuous columnar defects (CDs) and continuous CDs were formed in GdBCO coated conductors using Xe-ion irradiations with 80 and 270 MeV, respectively. An overall shift upward in Jc, for the 80-MeV-irradiated sample compared to the 270-MeV-irradiated one, can be observed in every direction of magnetic field, which is more remarkable as temperature decreases. This implies a synergetic effect of the pinning interaction between the linearity and the discontinuity for the discontinuous CDs.

Journal Articles

Direct numerical simulation on non-equilibrium superconducting dynamics after neutron capture in MgB$$_{2}$$ superconductor

Machida, Masahiko; Koyama, Tomio*; Kato, Masaru*; Ishida, Takekazu*

Nuclear Instruments and Methods in Physics Research A, 559(2), p.594 - 596, 2006/04

 Times Cited Count:11 Percentile:33.01(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Direct numerical simulations for non-equilibrium superconducting dynamics and related neutron detection in MgB$$_{2}$$

Machida, Masahiko; Koyama, Tomio*; Kato, Masaru*; Ishida, Takekazu*

Physica C, 426-431(1), p.169 - 173, 2005/10

no abstracts in English

Journal Articles

Numerical studies on the effect of normal-metal coatings on the magnetization characteristics of type-II superconductors

Carty, G. J.*; Machida, Masahiko; Hampshire, D. P.*

Physical Review B, 71(14), p.144507_1 - 144507_9, 2005/04

 Times Cited Count:11 Percentile:50.96(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Electronic structure of a half vortex

Machida, Masahiko; Koyama, Tomio*; Kato, Masaru*; Ishida, Takekazu*

Physica C, 412-414(Part 1), p.367 - 371, 2004/10

 Times Cited Count:4 Percentile:72.28(Physics, Applied)

no abstracts in English

Journal Articles

Unified theory for magnetic and electric field coupling in multistacked Josephson junctions

Machida, Masahiko; Sakai, Shigeki*

Physical Review B, 70(14), p.144520_1 - 144520_6, 2004/10

 Times Cited Count:32 Percentile:19.69(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Static spin correlations in lightly-doped La$$_2$$CuO$$_{4+delta}$$

Matsuda, Masaaki; Fujita, Masaki*; Yamada, Kazuyoshi*

Physica C, 408-410, p.810 - 811, 2004/08

 Times Cited Count:0 Percentile:100(Physics, Applied)

Neutron scattering experiments have been performed in lightly-doped La$$_2$$CuO$$_{4+delta}$$ in order to study coexistence of a three-dimensional antiferromagnetic (AF) long-range ordered phase and a spin-glass (SG) phase in a very lightly-doped region. Although we studied in a limited range of hole concentration, where N$'e$el temperature is between 270 K and 320 K, no sign of the SG phase was observed, suggesting that there may exist a threshold to realize the phase separation into the AF and SG phases.

Journal Articles

Localized rotating-modes in capacitively coupled intrinsic Josephson junctions; Systematic study of branching structure and collective dynamical instability

Machida, Masahiko; Koyama, Tomio*

Physical Review B, 70(2), p.024523_1 - 024523_6, 2004/07

 Times Cited Count:50 Percentile:11.77(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Direct numerical simulations for local superconductivity above upper critical field; Theoretical confirmation of stable precursors

Machida, Masahiko; Itakura, Mitsuhiro

Physica C, 392-396(1-4), p.331 - 335, 2003/10

no abstracts in English

Journal Articles

Scanning SQUID microscopy on magnetic flux systems

Suzuki, Junichi; Kadowaki, Kazuo; Hata, Yoshiaki*; Okayasu, Satoru; Nishio, Taichiro; Kakeya, Itsuhiro*; Odawara, Akikazu*; Nagata, Atsushi*; Nakayama, Satoshi*; Chinone, Kazuo*

Teion Kogaku, 38(9), p.485 - 492, 2003/09

no abstracts in English

Journal Articles

Phase diagram and dynamical matching of Josephson vortices in mesoscopic layered high-Tc superconductors

Machida, Masahiko

Physica C, 388-389, p.679 - 680, 2003/05

 Times Cited Count:0 Percentile:100

no abstracts in English

Journal Articles

Flux quantanization in a superconducting microdisk

Hata, Yoshiaki; Suzuki, Junichi; Kakeya, Itsuhiro*; Kadowaki, Kazuo*; Odawara, Akikazu*; Nagata, Atsushi*; Nakayama, Satoshi*; Chinone, Kazuo*

Physica C, 388-389(1-4), p.719 - 720, 2003/05

no abstracts in English

Journal Articles

Dynamical matching of Josephson vortex lattice with sample edge in layered high-${it Tc}$ superconductors; Origin of the periodic oscillation of flux flow resistance

Machida, Masahiko

Physical Review Letters, 90(3), p.037001_1 - 037001_4, 2003/01

 Times Cited Count:57 Percentile:11.03(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Absence of a magnetic field effect on static magnetic order in the electron-doped superconductor Nd$$_{1.86}$$Ce$$_{0.14}$$CuO$$_{4}$$

Matsuda, Masaaki; Katano, Susumu; Uefuji, T.*; Fujita, Masaki*; Yamada, Kazuyoshi*

Physical Review B, 66(17), p.172509_1 - 172509_4, 2002/11

 Times Cited Count:16 Percentile:35.69(Materials Science, Multidisciplinary)

no abstracts in English

121 (Records 1-20 displayed on this page)