Fluctuation conductivity of layered superconductors in a perpendicular magnetic field.
Fluctuation conductivity of layered superconductors in a perpendicular magnetic field.
复制标题
垂直磁场中层状超导体的涨落电导率。
DOI：
10.1103/physrevb.48.12951
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
Livanov
中科院分区：
文献类型：
--
作者：
Dorin;Klemm;Varlamov;Buzdin;Livanov
本文讨论了任意层内散射对层状超导体序参量涨落对轴电导率的主要贡献。来自正常准粒子态密度波动的贡献被证明与Aslamazov-Larkin和Maki-Thompson贡献的符号相反，导致整体[ital c]轴电阻率[rho][sub [ital c]]（[ital T]）高于[ital T][sub [ital c]]。该峰被磁场[粗体H][平行][粗体[cflx c]]增强。随着[ital H]的增加，[rho][sub [ital c]]（[ital T]，[ital H]）中的相对峰值最大值的幅度增加，并向较低温度移动，对于弱场，移动量与[ital H][sup 2]成正比，对于强场，移动量与[ital H]成正比。为了比较，平行于层的波动电导率已被计算，包括正常态密度的波动。我们的结果进行了讨论，在最近的实验与YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]]和Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub 8+[delta]]。
The leading contributions to the [ital c]-axis conductivity of layered superconductors arising from superconducting fluctuations of the order parameter are discussed for arbitrary intralayer scattering. The contributions from fluctuations of the normal quasiparticle density of states are shown to be opposite in sign to the Aslamazov-Larkin and Maki-Thompson contributions, leading to a peak in the overall [ital c]-axis resistivity [rho][sub [ital c]]([ital T]) above [ital T][sub [ital c]]. This peak is enhanced by a magnetic field [bold H][parallel][bold [cflx c]]. With increasing [ital H], the relative peak maximum in [rho][sub [ital c]]([ital T],[ital H]) increases in magnitude and is shifted to lower temperatures by an amount proportional to [ital H][sup 2] for weak fields and to [ital H] for strong fields. For comparison, the fluctuation conductivity parallel to the layers has been calculated including the fluctuations of the normal density of states. Our results are discussed in regard to recent experiments with YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]] and Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub 8+[delta]].