Observation of Compositional Fluctuation by Scanning Superconducting Quantum Interference Device (SQUID) Microscope in Superconducting La1.8Sr0.2CuO4
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概要
- 論文の詳細を見る
In order to visualize spatial distributions of vortices strongly pinned in La1.8Sr0.2CuO4, we have performed scanning superconducting quantum interference device (SQUID) microscopic (SSM) measurements near $T_{\text{c}}$. The obtained SSM images have revealed that stripe-shaped regions with higher $T_{\text{c}}$ run in an arbitrary direction with respect to crystallographic axes. Vortices tend to align in a one-dimensional fashion, negotiating around the higher $T_{\text{c}}$ regions. High-resolution electron probe micro-analysis confirmed that the spatial variation in $T_{\text{c}}$ corresponds well to the modulation of Sr/La composition. We also found that small-angle grain boundaries with tilt angles of 1–3 degrees are less effective in trapping vortices, indicating that superconductivity is not degraded very much.
- Japan Society of Applied Physicsの論文
- 2004-10-15
著者
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Togawa Yoshihiko
Department Of Superconductivity University Of Tokyo
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KASAI Junpei
Frontier Collaborative Research Center, Tokyo Institute of Technology
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OKAZAKI Noriaki
Advanced Materials Laboratory, National Institute for Materials Science
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HASEGAWA Tetsuya
Advanced Materials Laboratory, National Institute for Materials Science
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SHIMOYAMA Jun-ichi
SORST, Japan Science and Technology Corporation
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KISHIO Kohji
SORST, Japan Science and Technology Corporation
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KAWASAKI Masashi
Advanced Materials Laboratory, National Institute for Materials Science
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KOINUMA Hideomi
Advanced Materials Laboratory, National Institute for Materials Science
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Sasagawa Takao
Department Of Advanced Materials Science University Of Tokyo:sorst Japan Science And Technology Corp
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Shimoyama Jun-ichi
SORST, Japan Science and Technology Corporation, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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Ohtani Makoto
Insitute of Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
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Fukumura Tomoteru
Insitute of Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
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Sasagawa Takao
Department of Superconductivity, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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Hasegawa Tetsuya
Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
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Kasai Junpei
Frontier Collaborative Research Center, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
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Kawasaki Masashi
Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
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Togawa Yoshihiko
Department of Superconductivity, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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Koinuma Hideomi
Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
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Kishio Kohji
SORST, Japan Science and Technology Corporation, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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