Excess current in superconducting Sr$_2$RuO$_4$

Details Excess current in superconducting Sr$_2$RuO$_4$ Excess current in superconducting Sr$_2$RuO$_4$

2003-01-14

arxiv.org/abs/cond-mat/0301221v2

Phys. Rev. B 69, 014516 (2004)

Physics

Condensed Matter

Superconductivity

4 pages REVTeX, 3 figures; Using a modified p-wave model are able to reproduce the linear temperature dependence of the excess

Scientific paper

10.1103/PhysRevB.69.014516

We present results from point-contact measurements on Sr$_2$RuO$_4$ that show a linear dependence of the excess current as a function of temperature and applied magnetic fields over a surprisingly wide range of the phase diagram. We propose an explanation of this finding in terms of a p-wave triplet-pairing state with coupling to a low-energy fluctuation mode. Within this model we obtain a quantitative description of the temperature dependence of the excess current. The impact of surface effects on order parameter and excess current is addressed.

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