Phase-Sensitive Flux-Flow resistivity in Unconventional Superconductors

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We theoretically investigate the magnetic-field-angle dependence of the flux-flow resistivity ρ f in unconventional superconductors. Two contributions to ρ f are considered: one is the quasiparticle (QP) relaxation time τ(k F) and the other is ω₀(k F), which is a counterpart to the interlevel spacing of the QP bound states in the quasiclassical approach. Here, k 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 ρ f differs prominently between s-wave and d-wave pairs, reflecting the phase of the pair potentials. We also discuss the case where τ is constant and compare it with the more general case where τ depends on k F.