Transport properties of extended-s-state superconductors

Abstract

Superconducting states with "extended s-wave" symmetry have been suggested in connection with recent ARPES experiments on BSCCO. In the presence of impurities, thermodynamic properties of such states re ect a residual density of states N (0) for a range of concentrations. While properties re ecting N (!) alone will be similar to those of d-wave states, transport measurements may be shown to qualitatively distinguish between the two. In contrast to the d-wave case with unitarity limit scattering, limiting low-temperature residual conductivities in the s-wave state are large and scale inversely with impurity concentration.

Lifting of nodes by disorder in extended-s-state superconductors: Application to ferropnictides

“…This picture will have implications for other properties, including transport properties, as discussed in Ref. 51 for the 1-band situation, but there may be interesting modifications peculiar to the multiband case. Work on this direction is in progress.…”

Variation of the extended s-wave superconducting order parameter: From s-wave to g-wave

“…It is often called 'an extended s-wave'. [10][11][12][13] s + g-wave order parameter, studied in connection with the non-magnetic borocarbides, [14][15][16] is a good example of the extended swave.…”

Nonmagnetic impurities in two-dimensional superconductors

“…Nuclear Magnetic Resonance measurements by Mahajan and co-workers 3 show that the copper spin correlations are severely modified on neighboring Cu sites, which could in principle give rise to effects analogous to the spin-flip scattering process of conventional magnetic impurities. As discussed recently by Borkowski and Hirschfeld 4 , the unknown relative strength of spin flip and impurity scattering rates in…”