Muon spin rotation study of the magnetic penetration depth in the intercalated graphite superconductor CaC6

D. Di Castro; A. Kanigel; A. Maisuradze; A. Keren; P. Postorino; D. Rosenmann; U. Welp; G. Karapetrov; H. Claus; D. G. Hinks; A. Amato; J. C. Campuzano

doi:10.1103/PhysRevB.82.014530

Muon spin rotation study of the magnetic penetration depth in the intercalated graphite superconductor CaC6

D. Di Castro, A. Kanigel, A. Maisuradze, A. Keren, P. Postorino, D. Rosenmann, U. Welp, G. Karapetrov, H. Claus, D. G. Hinks, A. Amato, J. C. Campuzano

DOI 10.1103/PhysRevB.82.014530 · Physical Review B

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Abstract

We report temperature- and magnetic field-dependent bulk muon spin rotation measurements in a c-axis-oriented superconductor CaC6 in the mixed state. Using both a simple second-moment analysis and the more precise analytical Ginzburg-Landau model, we obtained a field-independent in-plane magnetic penetration depth λab(0)=72(3) nm. The temperature dependencies of the normalized muon spin relaxation rate and of the normalized superfluid density result to be identical and both are well represented by the clean limit BCS model with 2Δ/kBTc=3.6(1), suggesting that CaC6 is a fully gapped BCS superconductor in the clean limit regime.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
CaC6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	11.5	Pressure not reported	unknown
CaC6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	11.6	Pressure not reported	onset