Strong pressure dependence of the magnetic penetration depth in single crystals of the heavy fermion superconductor CeCoIn5 studied by muon spin rotation

Abstract

In the tetragonal heavy fermion system CeCoIn5 the unconventional superconducting state is probed by means of muon spin rotation. The pressure dependence (0-1 GPa) of the basal-plane magnetic penetration depth (λ_a), the penetration depth anisotropy (γ=λ_c/λ_a) and the temperature dependence of 1/λ_i^2 (i=a,c) were studied in single crystals. A strong decrease of λ_a with pressure was observed, while γand λ_i^2(0)/λ_i^2(T) are pressure independent. A linear relationship between 1/λ_a^2(270 mK) and Tc was also found. The large decrease of λ_a with pressure is the signature of an increase of the number of superconducting quasiparticles by a factor of about 2.

arXiv comment5 pages, 6 figures. To appear in PRL

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• Evidence for Coexistence of Bulk Superconductivity and Itinerant Antiferromagnetism in the Heavy Fermion System CeCo(In${}_{1-x}$Cd${}_x$)${}_5$
• Visualizing Heavy Fermion Confinement and Pauli-Limited Superconductivity in Layered CeCoIn5
• Local characterization of a heavy-fermion superconductor via sub-Kelvin magnetic force microscopy
• Landau Renormalizations of Superfluid density in Heavy Fermion Superconductor CeCoIn5
• Quantum critical quasiparticle scattering within the superconducting state of CeCoIn5