title: Superfluid density in gapless superconductor CeCoIn(5).
abstract: Temperature dependence of the London penetration depth λ measured in single crystals of CeCoIn(5) is interpreted as being caused by a strong pair-breaking scattering that makes the superconductivity in this compound gapless. For a gapless d-wave superconductor, we derive λ = λ(0)(1-T(2)/T(c)(2))(-1/2) caused by the 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.
authors.affiliation: Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA.
authors.forename: V G
authors.initials: VG
authors.lastname: Kogan
authors.forename: R
authors.initials: R
authors.lastname: Prozorov
authors.forename: C
authors.initials: C
authors.lastname: Petrovic