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Large energy gaps inCaC6from tunneling spectroscopy: Possible evidence of strong-coupling superconductivity
2007
Physical Review B
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Point-contact tunneling on CaC_6 crystals reproducibly reveals superconducting gaps, Δ, of 2.3±0.2 meV which are ∼ 40 than earlier reports. That puts CaC_6 into the class of very strong-coupled superconductors since 2Δ/kT_c∼ 4.6. Thus soft Ca phonons will be primarily involved in the superconductivity, a conclusion that explains the large Ca isotope effect found recently for CaC_6. Consistency among superconductor-insulator-normal metal (SIN), SIS and Andreev reflection (SN) junctions reinforces the intrinsic nature of this result.
doi:10.1103/physrevb.76.220502
fatcat:uhntoyoejjbonirzhr7eufqfqm