Fluctuation Conductivity in Unconventional Superconductors near Critical Disorder

Abstract

The fluctuation conductivity ${\sigma }_{\mathrm{s}}$ in bulk superconductors with non s-wave pairing and with nonmagnetic disorder of strength $D$ is studied at low $T$ and within the Gaussian approximation. It is shown by assuming a quasi two-dimensional (2D) electronic state that, only if the gap function $d_μ({\p})$ is, as in a 2D p-wave pairing state, linear in the in-plane (relative) momentum ${\p}_\perp$, the in-plane fluctuation conductivity on the line $D=D_c$ is weakly divergent in low $T$ limit. The present result may be useful in clarifying the true gap function of spin-triplet $\mathrm{S}{\mathrm{r}}_2\mathrm{Ru}{\mathrm{O}}_4$ through resistivity measurements.

8 pages, 1 figure, to be published in J. Phys. Soc. Jpn. 70, No.10 (2001)

References in corpus (1)

• The Order Parameter for the Superconducting Phases of UPt${}_3$

Cited by in corpus (4)

• Probing the d_{x2-y2}-wave Pomeranchuk instability by ultrasound
• Order parameter symmetry and mode coupling effects at dirty superconducting quantum phase transitions
• Superfluid Quantum Criticality in Liquid 3He in Anisotropic Aerogel
• Transport anomalies in multiband superconductors near quantum critical point