Published in
American Physical Society, Physical Review Letters, 1(110), 2013
DOI: 10.1103/physrevlett.110.017005
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Strong Pressure Dependence of the Magnetic Penetration Depth in Single Crystals of the Heavy-Fermion SuperconductorCeCoIn5Studied by Muon Spin Rotation
,
A. Maisuradze,
P. Dalmas de Réotier,
A. Yaouanc,
C. Baines,
G. Lapertot,
K. Mony,
J.-P. Brison,
H. Keller
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Abstract
In the tetragonal heavy fermion system CeCoIn_{5} 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 γ and λ_{i}^{2}(0)/λ_{i}^{2}(T) are pressure independent. A linear relationship between 1/λ_{a}^{2}(270 mK) and T_{c} 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.