Role of Coulomb interaction in the superconducting properties of CaC6 and H under pressure

Abstract

Superconductivity in intercalated graphite CaC6 and H under extreme pressure, in the framework of superconducting density functional theory, is discussed. A detailed analysis on how the electron-phonon and electron-electron interactions combine together to determine the superconducting gap and critical temperature of these systems is presented. In particular, we discuss the effect on the calculated Tc of the anisotropy of the electron-phonon interaction and of the different approximations for screening the Coulomb repulsion. These results contribute to the understanding of multigap and anisotropic superconductivity, which has received a lot of attention since the discovery of MgB2, and show how it is possible to describe the superconducting properties of real materials on a fully ab-initio basis.

13 pages, 5 figures

References in corpus (4)

• Specific Heat of the Ca-Intercalated Graphite Superconductor CaC${}_6$
• Possibility of superconductivity in graphite intercalated with alkaline earths investigated with density functional theory
• Evidence for gap anisotropy in CaC6 from directional point-contact spectroscopy
• Far-infrared signature of the superconducting gap in intercalated graphite CaC6

Cited by in corpus (7)

• High-temperature Superconductivity in Layered Nitrides β-Li${}_x$MNCl (M = Ti, Zr, Hf): Insights from Density-functional Theory for Superconductors
• Superconducting pairing mediated by spin-fluctuations from first principles
• Ab initio theory of plasmonic superconductivity within the Eliashberg and density-functional formalisms
• Superconducting Chevrel phase PbMo${}_6$S${}_8$ from first principles
• Why Mercury is a superconductor
• Search for thermodynamically stable ambient-pressure superconducting hydrides in GNoME database
• Uniform electron benchmark for the first-principles $G{W}_0$-Eliashberg theory