Locking of length scales in two-band superconductors
Abstract
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} --> 0, i.e., for nearly decoupled bands.
Keywords
Cite
@article{arxiv.1610.00136,
title = {Locking of length scales in two-band superconductors},
author = {M. Ichioka and V. G. Kogan and J. Schmalian},
journal= {arXiv preprint arXiv:1610.00136},
year = {2017}
}
Comments
7 pages, 8 figures