Y
Y. Nakayama
Researcher at University of Tokyo
Publications - 42
Citations - 1219
Y. Nakayama is an academic researcher from University of Tokyo. The author has contributed to research in topics: Flux pinning & Thin film. The author has an hindex of 16, co-authored 42 publications receiving 1192 citations. Previous affiliations of Y. Nakayama include Kyoto University.
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Journal ArticleDOI
High Critical-Current Density in the Heavily Pb-Doped Bi2Sr2CaCu2O8+δ Superconductor: Generation of Efficient Pinning Centers
I. Chong,Zenji Hiroi,Zenji Hiroi,M. Izumi,M. Izumi,Jun-ichi Shimoyama,Jun-ichi Shimoyama,Y. Nakayama,Y. Nakayama,K. Kishio,K. Kishio,T. Terashima,T. Terashima,Yosuke Bando,Yosuke Bando,Mikio Takano,Mikio Takano +16 more
TL;DR: A marked increase in critical-current density was observed in Bi2Sr2CaCu2O8+delta (Bi-2212) single crystals doped with a large amount of Pb, and characteristic microstructures were revealed that probably underlie the observed enhancement.
Journal ArticleDOI
Giant magnetostriction in Bi2Sr2CaCu2O8 single crystal in the superconducting state and its mechanism.
TL;DR: A quantitative model has been proposed which accounts for the magnetostriction in terms of internal forces arising from flux pinning.
Journal ArticleDOI
Compositional dependence of transport anisotropy in large (La, Sr)2CuO4 single crystals and second peak in magnetization curves
Tsuyoshi Kimura,Kohji Kishio,Tsutomu Kobayashi,Y. Nakayama,Naobumi Motohira,Koichi Kitazawa,K. Yamafuji +6 more
TL;DR: In this paper, a complete set of electrical resistivity data along both the c -axis ( ϱ c ) and ab -plane (π� ab ) have been obtained via the DC four-probe method for the first time.
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Observation of individual vortices trapped along columnar defects in high-temperature superconductors
Akira Tonomura,Hiroto Kasai,Osamu Kamimura,Tsuyoshi Matsuda,Ken Harada,Y. Nakayama,Jun-ichi Shimoyama,K. Kishio,Tetsuo Hanaguri,K. Kitazawa,Masato Sasase,Satoru Okayasu +11 more
TL;DR: This work achieves the resolution required to image vortex lines and columnar defects in Bi2Sr2CaCu2O8+δ (Bi-2212) thin films, using a 1-MV field-emission electron microscope and finds that the vortex lines at higher temperatures are trapped and oriented along tiltedColumnar defects, irrespective of the orientation of the applied magnetic field.
Journal ArticleDOI
Systematic decrease of resistivity anisotropy in Bi 2 Sr 2 CaCu 2 O y by Pb doping
TL;DR: In this article, out-of-plane and in-plane resistivity measurements were carried out on single crystals with various Pb content, and the absolute value of the resistivity anisotropy in the normal state systematically decreased with increasing Pb contents, whereas no appreciable change was observed in either case.