Effect of anisotropic Fermi surface on the flux-flow resistivity under rotating magnetic field

TL;DR

This study numerically explores how anisotropic Fermi surfaces influence flux-flow resistivity under rotating magnetic fields, revealing methods to detect pairing phase and gap-node directions despite FS anisotropy.

Contribution

It demonstrates that flux-flow resistivity measurements under rotating fields can reveal pairing phase and gap-node directions regardless of Fermi surface anisotropy.

Findings

Field-angular dependence of ρ_f reveals pairing phase.

Measurement of ρ_f detects gap-node directions.

Anisotropic FS does not hinder phase and node detection.

Abstract

We numerically investigate the effect of in-plane anisotropic Fermi surface (FS) on the flux-flow resistivity $\rho_{\rm f}$ under rotating magnetic field on the basis of the quasiclassical Green's function method. We demonstrate that one can detect the phase in pairing potential of Cooper pair through the field-angular dependence of $\rho_{\rm f}$ even if the FS has in-plane anisotropy. In addition, we point out one can detect the gap-node directions irrespective of the FS anisotropy by measuring $\rho_{\rm f}$ under rotating field.