Superfluid density in gapless superconductor CeCoIn5
Abstract
Temperature dependence of the London penetration depth λ measured in single crystals of CeCoIn5 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 λ=λ0/1-(T/Tc)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 Tc that compares well with the measured slope.
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