Journal
PHYSICAL REVIEW B
Volume 76, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.76.052511
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The intercalated graphite superconductor CaC6 with T-c similar to 11.5 K has been characterized with angular dependent magnetoresistance measurements. Above T-c, the interplane resistivity can be fitted to the Bloch-Gruneisen model providing a Debye temperature of theta(D)=175 K. From these parameters, the McMillan formula yields an electron-phonon coupling constant lambda similar to 1.1, placing this material in the intermediate-to-strong coupling regime. For 1.4 K < T < T-c, the upper critical field B-c2 is found to be anisotropic and linear in temperature.
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