Fluctuation Conductivity in Unconventional Superconductors near Critical Disorder

Details Fluctuation Conductivity in Unconventional Superconductors near Critical Disorder Fluctuation Conductivity in Unconventional Superconductors near Critical Disorder

2001-09-21

arxiv.org/abs/cond-mat/0109389v2

Physics

Condensed Matter

Superconductivity

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

Scientific paper

10.1143/JPSJ.70.2848

The fluctuation conductivity $\sigma_{\rm s}$ 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 $d_\mu({\p})$ 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 ${\rm Sr_2RuO_4}$ through resistivity measurements.

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