Andreev reflection between a normal metal and the FFLO superconductor II: a self-consistent approach
Abstract
We consider Andreev reflection in a two dimensional junction between a normal metal and a heavy fermion superconductor in the Fulde-Ferrell (FF) type of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state. We assume s-wave symmetry of the superconducting gap. The parameters of the superconductor: the gap magnitude, the chemical potential, and the Cooper pair center-of-mass momentum Q, are all determined self-consistently within a mean-field (BCS) scheme. The Cooper pair momentum Q is chosen as perpendicular to the junction interface. We calculate the junction conductance for a series of barrier strengths. In the case of incoming electron with spin \sigma = 1 only for magnetic fields close to the upper critical field H_{c2}, we obtain the so-called Andreev window i.e. the energy interval in which the reflection probability is maximal, which in turn is indicated by a peak in the conductance. The last result differs with other non-self-consistent calculations existing in the literature.
Cite
@article{arxiv.1010.4136,
title = {Andreev reflection between a normal metal and the FFLO superconductor II: a self-consistent approach},
author = {J. Kaczmarczyk and M. Sadzikowski and J. Spałek},
journal= {arXiv preprint arXiv:1010.4136},
year = {2011}
}
Comments
15 pages, 6 figures, accepted in Physica C