Phase-Sensitive Flux-Flow resistivity in Unconventional Superconductors

Abstract

We theoretically investigate the magnetic-field-angle dependence of the flux-flow resistivity ${\rho }_{\mathrm{f}}$ in unconventional superconductors. Two contributions to ${\rho }_{\mathrm{f}}$ are considered: one is the quasiparticle (QP) relaxation time $\tau ({\mathbf{k}}_{\mathrm{F}})$ and the other is ${\omega }_0({\mathbf{k}}_{\mathrm{F}})$, which is a counterpart to the interlevel spacing of the QP bound states in the quasiclassical approach. Here, ${\mathbf{k}}_{\mathrm{F}}$ denotes the position on a Fermi surface. Numerical calculations are conducted for a line-node s-wave and a d-wave pair potential with the same anisotropy of their amplitudes, but with a sign change only for a d-wave one. We show that the field-angle dependence of ${\rho }_{\mathrm{f}}$ differs prominently between s-wave and d-wave pairs, reflecting the phase of the pair potentials. We also discuss the case where $\tau$ is constant and compare it with the more general case where $\tau$ depends on ${\mathbf{k}}_{\mathrm{F}}$.

4 pages, 3 figures; Proc. of LT26

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Cited by in corpus (2)

• Field-angle Resolved Flux-flow Resistivity as a Phase-sensitive Probe of Unconventional Cooper Pairing
• Effect of anisotropic Fermi surface on the flux-flow resistivity under rotating magnetic field