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Strong pressure dependence of the magnetic penetration depth in single crystals of the heavy-fermion superconductor CeCoIn_{5} studied by Muon Spin Rotation


Howald, L; Maisuradze, A; de Réotier, P; Yaouanc, A; Baines, C; Lapertot, G; Mony, K; Brison, J P; Keller, H (2013). Strong pressure dependence of the magnetic penetration depth in single crystals of the heavy-fermion superconductor CeCoIn_{5} studied by Muon Spin Rotation. Physical Review Letters, 110(1): 017005.

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 (λa), the penetration depth anisotropy (γ=λc/λa) and the temperature dependence of 1/λi2 (i=a, c) were studied in single crystals. A strong decrease of λa with pressure was observed, while γ and λi2(0)/λi2(T) are pressure independent. A linear relationship between 1/λa2(270  mK) and Tc was also found. The large decrease of λa with pressure is the signature of an increase of the number of superconducting quasiparticles by a factor of about 2.

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 (λa), the penetration depth anisotropy (γ=λc/λa) and the temperature dependence of 1/λi2 (i=a, c) were studied in single crystals. A strong decrease of λa with pressure was observed, while γ and λi2(0)/λi2(T) are pressure independent. A linear relationship between 1/λa2(270  mK) and Tc was also found. The large decrease of λa with pressure is the signature of an increase of the number of superconducting quasiparticles by a factor of about 2.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2013
Deposited On:22 Mar 2013 13:02
Last Modified:05 Apr 2016 16:26
Publisher:American Physical Society
ISSN:0031-9007
Publisher DOI:https://doi.org/10.1103/PhysRevLett.110.017005

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