Vortex Glass Scaling of Conductivity
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概要
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The scaling behavior of dc condtrctivity o... in a ctrrrent perpendictular to the magnetic fieldnear a vortex-glass (VG) transition is addressed in terrns of the Ginzburg-Landatr (GL) znodeland Ktrbo formtrla and by assuming a trniversal scaling behavior of' the VG correlation ftmnction.Together with the uncorrelated T.-disorder, we also take account of another type of uncorre-fated disorder which becomes a fanxiliar expression once assuming the phase-only approxima-tion. Based on a calctrlation perturbative in the pinning disorders, we show that both of thesetmncorrelated disorders are necessary in order to obtain the universal scaling of o.. proposed byFisher et at. [Phys. Rev. B 43 (1991) 1304, and that, if either of thetn is negligible, the scalingbehavior of o.. can be apparently nontnniversal even deep in the VG critical region. Our resultsexplain, withottt invoking a possible destrtmction of true VG transition due to screening, whythe vanishing resistivity data show a nonuniversal behavior with a field-dependent exponent insituations with point disorder suppressing the first-order transitiozu.
- 一般社団法人日本物理学会の論文
- 1997-06-15
著者
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Ikeda R
Department Of Physics Kyoto University
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Ikeda Ryuichi
Department Of Chemistry University Of Tsukuba
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Ikeda Ryusuke
Department Of Physics Kyoto University
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