Correlation between Anomalous Peak Effect in Magnetic Hysteresis Loop and Nanoscale Structure for NdBa_2Cu_3O_<7-δ> Single-Crystal Superconductor
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概要
- 論文の詳細を見る
To investigate the correlation between an anomalous peak effect in the magnetic hysteresis (M-H) loop and microstructure for the NdBa_2Cu_3O_<7-δ> (Nd123) single-crystal superconductor, M-H loops were measured with a superconducting quantum interference device (SQUID) magnetometer, and microstructures were observed by transmission electron microscopy (TEM). A TEM image (observed from [001] direction) of the Nd123 single crystal, which has an anomalous peak in the M-H loop, shows a nanoscale modulated structure (tweedlike image). This crystal also has the twin structure, as observed by polarized optical microscopy. In contrast, the Nd123 crystal, which has shown no anomalous peak effect, was found to possess no modulated structure, but twin structure was observed. Therefore the nanoscale structure (the modulated structure) is considered to be responsible for the anomalous peak effect in the M-H loop. Moreover temperature independence of the anomalous peak field in M-H loops was confirmed. We conclude that the nanoscale modulated structure may act as effective pinning center when its length matches that of the vortex lattice spacing.
- 社団法人応用物理学会の論文
- 1996-07-15
著者
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Yokoyama Y
Inst. For Materials Res. Tohoku Univ.
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Yoshida Y
Department Of Energy Engineering And Science Nagoya University
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HIRAYAMA Tsukasa
Materials Research and Development Laboratory, Japan Fine Ceramics Center
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YAMADA Yasuji
Superconductivity Research Laboratory, ISTEC
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SHIOHARA Yuh
Superconductivity Research Laboratory, ISTEC
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Yamada Y
Akita Univ. Akita Jpn
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Yamada Yuh
National Research Institute For Metals
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Hirayama Tsukasa
Japan Fine Ceramics Center
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Hirayama Tsukasa
Electron Wavefront Project Research Development Corporation Of Japan C/o Faculty Of Engineering Toyo
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Shiohara Yuh
Superconducting Research Laboratory Istec
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IKUHARA Yuichi
Japan Fine Ceramics Center
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Yamada Yasuji
Superconductivity Research Laboratory Division Viii International Superconductivity Technology Cente
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NAKAMURA Masaru
Superconductivity Research Laboratory, ISTEC
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Nakamura Masaru
Superconductivity Research Laboratory Isotec
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Hirayama Tsukasa
Materials R&d Laboratory Japan Fine Ceramics Center
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Yokoyama Yoshihiko
Superconductivity Research Laboratory, International Superconductivity Technology Center
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