Abstract
Anisotropy effects of the gap function on superconducting properties in a 2H-type transition-metal dichalcogenide NbS 2 are studied by solving the anistropic Eliashberg equation with the use of Fermi-surface harmonics. Due to the characteristics dependences on wave vectors of the electron-phonon interaction and renormalized phonon frequencies, anisotropic components of the electron-phonon spectral function have relatively large values in the frequency range between 5 and 10 meV, where the frequencies of the Σ 1-phonon modes around q = ⅔ΓM are renormalized significantly. The superconducting transition temperature T c evaluated by solving the anisotropic Eliashberg equation is slightly higher than that evaluated by solving the isotropic Eliashberg equation. Anistropy of the mass enhancement factor and that of the superconducting gap function just below T c are also evaluated.
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