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Muon spin rotation study of the intercalated graphite superconductor CaC6 at low temperatures


Murányi, F; Bendele, M; Khasanov, R; Guguchia, Z; Shengelaya, A; Baines, C; Keller, H (2012). Muon spin rotation study of the intercalated graphite superconductor CaC6 at low temperatures. Journal of Superconductivity and Novel Magnetism, 25(2):159-163.

Abstract

Muon spin rotation (μSR) experiments were performed on the intercalated graphite CaC6 in the normal and superconducting state down to 20 mK. In addition, AC magnetization measurements were carried out resulting in an anisotropic upper critical field , from which the coherence lengths ξ ab (0)=36.3(1.5) nm and ξ c (0)=4.3(7) nm were estimated. The anisotropy parameter TeX increases monotonically with decreasing temperature. A single isotropic s-wave description of superconductivity cannot account for this behavior. From magnetic field dependent μSR experiments, the absolute value of the in-plane magnetic penetration depth λ ab (0)=78(3) nm was determined. The temperature dependence of the superfluid density ρ s (T) is slightly better described by a two-gap than a single-gap model.

Abstract

Muon spin rotation (μSR) experiments were performed on the intercalated graphite CaC6 in the normal and superconducting state down to 20 mK. In addition, AC magnetization measurements were carried out resulting in an anisotropic upper critical field , from which the coherence lengths ξ ab (0)=36.3(1.5) nm and ξ c (0)=4.3(7) nm were estimated. The anisotropy parameter TeX increases monotonically with decreasing temperature. A single isotropic s-wave description of superconductivity cannot account for this behavior. From magnetic field dependent μSR experiments, the absolute value of the in-plane magnetic penetration depth λ ab (0)=78(3) nm was determined. The temperature dependence of the superfluid density ρ s (T) is slightly better described by a two-gap than a single-gap model.

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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:2012
Deposited On:19 Apr 2012 06:43
Last Modified:18 Feb 2018 02:34
Publisher:Springer
ISSN:1557-1939
OA Status:Closed
Publisher DOI:https://doi.org/10.1007/s10948-011-1358-3

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