High-field quasiparticle tunneling in Bi2Sr2CaCu2O(8+delta): negative magnetoresistance in the superconducting state
High-field quasiparticle tunneling in Bi2Sr2CaCu2O(8+delta): negative magnetoresistance in the superconducting state
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Bi2Sr2CaCu2O(8 delta) 中的高场准粒子隧道效应：超导态下的负磁阻
DOI：
10.1103/physrevlett.84.1784
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发表时间：
1999
影响因子：
8.6
通讯作者：
Yamashita
中科院分区：
文献类型：
--
作者：
Morozov;Krusin;Shibauchi;Bulaevskii;Maley;Latyshev;Yamashita
我们报告了 Bi(2)Sr(2)CaCu(2)O(8+delta) 中的 c 轴电阻率 rho(c)(H)，其在高达 60 T 的准静态磁场中达到峰值。通过抑制双通道（库珀对/准粒子）电导率 sigma(c)(H) 的约瑟夫森部分，我们发现峰值上方的 rho(c)(H) 的负斜率是由于准粒子隧道电导率造成的sigma(q)(H) 穿过 H(c2) 下面的 CuO2 层。在高场处，(a) sigma(q)(H) 随 H 线性增长，(b) rho(c)(T) 当 T-->0 时趋于饱和（sigma(c) 不等于 0），与 d 波间隙节点处的散射一致。超线性 sigma(q)(H) 标记高于 T(c) 的正常状态。
We report on the c-axis resistivity rho(c)(H) in Bi(2)Sr(2)CaCu(2)O(8+delta) that peaks in quasistatic magnetic fields up to 60 T. By suppressing the Josephson part of the two-channel (Cooper pair/quasiparticle) conductivity sigma(c)(H), we find that the negative slope of rho(c)(H) above the peak is due to quasiparticle tunneling conductivity sigma(q)(H) across the CuO2 layers below H(c2). At high fields (a) sigma(q)(H) grows linearly with H, and (b) rho(c)(T) tends to saturate ( sigma(c) not equal0) as T-->0, consistent with the scattering at the nodes of the d-wave gap. A superlinear sigma(q)(H) marks the normal state above T(c).