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Journal of Superconductivity and Novel Magnetism

, Volume 25, Issue 2, pp 159–163 | Cite as

Muon Spin Rotation Study of the Intercalated Graphite Superconductor CaC6 at Low Temperatures

  • F. MurányiEmail author
  • M. Bendele
  • R. Khasanov
  • Z. Guguchia
  • A. Shengelaya
  • C. Baines
  • H. Keller
Letter

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 \(H_{\text{c2}}\), 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 \(\gamma _{H}=H_{\text{c2}}^{ab}/H_{\text{c2}}^{c}\) 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.

Keywords

Superconducting materials Penetration depth Muon spin rotation and relaxation 

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • F. Murányi
    • 1
    Email author
  • M. Bendele
    • 1
    • 2
  • R. Khasanov
    • 2
  • Z. Guguchia
    • 1
  • A. Shengelaya
    • 3
  • C. Baines
    • 2
  • H. Keller
    • 1
  1. 1.Physik-Institut der Universität ZürichZürichSwitzerland
  2. 2.Laboratory for Muon Spin SpectroscopyPaul Scherrer InstituteVilligen PSISwitzerland
  3. 3.Department of PhysicsTbilisi State UniversityTbilisiGeorgia

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