Anisotropy in ac losses near the irreversibility field of Bi2Sr2CaCu2O8 |
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| Authors: | Yuji Yamaguchi Dong Han Ha Fumitoshi Iga and Yoshikazu Nishihara |
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| Affiliation: | (1) Electrotechnical Laboratory, 1-1-4 Umezuno, 305 Tsukuba, Japan;(2) Present address: KRISS, Taedok Science Town, 305-606 Taejon, Korea |
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| Abstract: | The ac susceptibility under a biased dc field near the irreversibility field (H
irr) of a Bi2Sr2CaCu2O8 single crystal has been measured. The frequency dependence, the ac-power dependence, and the nearly lossless character of the  vs.H
dc curve forH a-axis have been roughly explained from a reversible (elastic) fluxoid motion, while those forH c-axis have been explained from a thermally assisted flux-flow (TAFF) model. The obtained parameters are discussed in relation to anisotropic flux-pinning mechanisms in the layered structure of this compound. |
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| Keywords: | Ac susceptibility Bi2Sr2CaCu2O8 irreversibility fieldH
irr reversible fluxoid motion |
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