Superfluid density in gapless superconductor CeCoIn5

Details Superfluid density in gapless superconductor CeCoIn5 Superfluid density in gapless superconductor CeCoIn5

2007-12-11

arxiv.org/abs/0712.1632v1

Physics

Condensed Matter

Superconductivity

Scientific paper

Temperature dependence of the London penetration depth $\lambda$ measured in single crystals of CeCoIn$_5$ is interpreted as caused by a strong pair-breaking scattering that makes the superconductivity in this compound gapless. For a gapless d-wave superconductor, we derive $\lambda=\lambda_0/\sqrt{1-(T/T_c)^2}$ caused by combined effect of magnetic and non-magnetic scattering in excellent agreement with the data in the full temperature range and with the gapless s-wave case of Abrikosov and Gor'kov. We also obtain the slope of the upper critical field at $T_c$ that compares well with the measured slope.

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