Phase-Sensitive Impurity Effects in Vortex Core of Moderately Clean Chiral Superconductors : Condensed Matter: Electronic Properties, etc.
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We study impurity effects in vortex core of two-dimensional moderately clean superconductors within the quasiclassical theory. The impurity scattering rate F(E) of the Andreev bound states in vortex core with +1 vorticity of p-wave superconductors with d = z^^^ (p_x + ip_y) is suppressed, compared to the normal state scattering rate Γ_n in the energy region Γ^3_n /E^2_δ ≪ E ≪ E_δ ≡ |δ_0|Δ_∞ with scattering phase shift δ_0 (|δ_0| ≪ 1) and the pair-potential in bulk Δ_∞. Further we find that Γ(E)/Γ_n for p-wave superconductors with d = z^^^ (p_x - ip_y) is at most O(E/Δ_∞). 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 In(Δ_∞/E). Parity- and chirality-dependences of impurity effects are attributed to the Andreev reflections involved in the impurity-induced scattering between bound states. Implications for the flux flow conductivity is also discussed. Novel enhancement of flux flow conductivity is expected to occur at T E_ for d = z^^^ (p_x + ip_y) and at T _ for d = z^^^ (p_x - ip_y).
- 2000-10-15
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