TY - JOUR
T1 - Anisotropic gap of superconducting CaC6
T2 - A first-principles density functional calculation
AU - Sanna, A.
AU - Profeta, G.
AU - Floris, A.
AU - Marini, A.
AU - Gross, E. K.U.
AU - Massidda, S.
PY - 2007/1/30
Y1 - 2007/1/30
N2 - We report first-principles calculations of the superconducting properties of CaC6, obtained within the density functional theory of superconductivity. We find a moderately anisotropic gap which is larger on the Fermi surface sheet with interlayer and Ca character compared with isotropic calculations. Our calculated anisotropy improves the agreement with specific heat experiments and is consistent with recent tunneling experiments. In contrast to MgB2, we do not find multigap superconductivity but, instead, a continuous spread of gap values.
AB - We report first-principles calculations of the superconducting properties of CaC6, obtained within the density functional theory of superconductivity. We find a moderately anisotropic gap which is larger on the Fermi surface sheet with interlayer and Ca character compared with isotropic calculations. Our calculated anisotropy improves the agreement with specific heat experiments and is consistent with recent tunneling experiments. In contrast to MgB2, we do not find multigap superconductivity but, instead, a continuous spread of gap values.
UR - http://www.scopus.com/inward/record.url?scp=33846649510&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.75.020511
DO - 10.1103/PhysRevB.75.020511
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AN - SCOPUS:33846649510
SN - 1098-0121
VL - 75
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 2
M1 - 020511
ER -