Locking of length scales in two-band superconductors
Locking of length scales in two-band superconductors
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DOI：
10.1103/physrevb.95.064512
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发表时间：
2017-02-21
影响因子：
3.7
通讯作者：
Schmalian, J.
中科院分区：
文献类型：
--
作者：
Ichioka, M.;Kogan, V. G.;Schmalian, J.
利用具有柱面费米表面、不同费米速度v(1)、(2)和一般2×2耦合矩阵V-αβ的清洁两带S波超导体模型，研究了涡旋晶格中序参数的分布。用Eilenberger弱耦合方法数值计算了平行于费米柱体的涡旋两个频带的配对振幅Delta(1)和Delta(2)的空间分布。对于带间耦合V-12的通用值，结果表明，与耦合V-αβ、比v(1)/v(2)、温度和外加磁场无关，Delta(1)和Delta(2)的空间变化的长度尺度在我们的计算精度内是相同的。这种单一长度比例行为的唯一例外是V-12
A model of a clean two-band s-wave superconductor with cylindrical Fermi surfaces, different Fermi velocities v(1),(2), and a general 2x2 coupling matrix V-alpha beta is used to study the order parameter distribution in vortex lattices. The Eilenberger weak coupling formalism is used to calculate numerically the spatial distributions of the pairing amplitudes Delta(1) and Delta(2) of the two bands for vortices parallel to the Fermi cylinders. For generic values of the interband coupling V-12, it is shown that, independently of the couplings V-alpha beta, of the ratio v(1)/v(2), of the temperature, and the applied field, the length scales of spatial variation of Delta(1) and of Delta(2) are the same within the accuracy of our calculations. The only exception from this single length-scale behavior is found for V-12