Phase-Sensitive Impurity Effects in Vortex Core of Moderately Clean Chiral Superconductors

Yusuke Kato

doi:10.1143/JPSJ.69.3378

paper

Phase-Sensitive Impurity Effects in Vortex Core of Moderately Clean Chiral Superconductors

arXiv:cond-mat/0009296 · doi:10.1143/JPSJ.69.3378

Abstract

We study impurity effects in vortex core of two-dimensional moderately clean su perconductors within the quasiclassical theory. The impurity scattering rate $\G amma(E)$ of the Andreev bound states in vortex core with +1 vorticity of p-wav e superconductors with ${\mib d}=\hat{\mib z}(p_x+\iu p_y)$ is suppre ssed, compared to the normal state scattering rate $Γ_{n}$ in the energ y region $Γ_{n}^{3} / E_{δ}^{2} ≪ E ≪ E_{δ} \equiv ∣ δ_{0} ∣ Δ_{ı} n f t y$ with scattering phase shift $δ_{0}$ $(∣ δ_{0} ∣ ≪ 1)$ and the pair-po tential in bulk $Δ_{\infty}$ . Further we find that $Γ (E) / Γ_{n}$ for p-wave superconductors with ${\mib d}=\hat{\mib z}(p_x-\iu p_y)$ is at most $O (E / Δ_{ı} n f t y)$ . These results are in marked contrast to the even-parity case (s,d-wave), where $Γ (E) / Γ_{n}$ is known to be proportional to $ln (Δ_{ı} n f t y / E)$ . Parity- and chirality-dependences of impurity effects are attributed to the Andr eev reflections involved in the impurity-induced scattering between bound states . Implications for the flux flow conductivity is also discussed. Novel enhanceme nt of flux flow conductivity is expected to occur at $T ≪ E_{δ}$ for ${\mib d}=\hat{\mib z}(p_x+\iu p_y)$ and at $T ≪ Δ_{\infty}$ for ${\mib d}=\hat{\mib z}(p_x-\iu p_y)$.

9 pages, No figures, To appear in JPSJ Vol. 69, No. 10 (2000)

Phase-Sensitive Impurity Effects in Vortex Core of Moderately Clean Chiral Superconductors

Abstract

References in corpus (2)

Cited by in corpus (37)