The Superfluidity and Experimental Properties of Odd-Energy-Gap Superconductors

Physics – Condensed Matter

Scientific paper

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LaTeX, 13pp plus 6 PS figures included in PSBOX format UBCTP CM1-1993

Scientific paper

10.1209/0295-5075/26/2/011

We consider the experimental properties of superconductors with a gap which is an odd function of energy $\bepsk=\epsk - \mu$, i.e.\ , a gap which vanishes everywhere on the Fermi surface; this is done within a in a BCS framework. Apart from the standard phenomenology (density of states, penetration depth, NMR, $C_V(T)$, $B_{c2}(T)$), we also look at the stability of the superconducting state. It is stable to finite supercurrents (although with a normal fluid density which increases with the supercurrent density), and is also very weakly affected by non-magnetic impurities. We find two classes of odd-gap superconductors, which strongly differ in their low-energy properties. For a certain parameter range, most of the results resemble those for d-wave superconductors (except for the effect of impurities).

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