Anisotropy effects on superconductivity in layered material NbS2

Masafumi Shirai; Yosihmasa Nishio

doi:10.1016/0921-4526(95)00697-4

Anisotropy effects on superconductivity in layered material NbS₂

Research output: Contribution to journal › Article › peer-review

Abstract

Anisotropy effects of the gap function on superconducting properties in a 2H-type transition-metal dichalcogenide NbS₂ are studied by solving the anisotropic Eliashberg equation with the use of Fermi-surface harmonics. Due to the characteristic dependences on wave vectors of the electron-phonon interaction and renornialized 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 ∑₁-phonon modes around q -2/3ΓM 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. Anisotropy of the mass enhancement factor and that of the superconducting gap function just below T_c are also evaluated.

Original language	English
Pages (from-to)	207-209
Number of pages	3
Journal	Physica B: Condensed Matter
Volume	219-220
Issue number	1-4
DOIs	https://doi.org/10.1016/0921-4526(95)00697-4
Publication status	Published - 1996 Apr 1
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1016/0921-4526(95)00697-4

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abstract = "Anisotropy effects of the gap function on superconducting properties in a 2H-type transition-metal dichalcogenide NbS2 are studied by solving the anisotropic Eliashberg equation with the use of Fermi-surface harmonics. Due to the characteristic dependences on wave vectors of the electron-phonon interaction and renornialized 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 ∑1-phonon modes around q -2/3ΓM are renormalized significantly. The superconducting transition temperature Tc evaluated by solving the anisotropic Eliashberg equation is slightly higher than that evaluated by solving the isotropic Eliashberg equation. Anisotropy of the mass enhancement factor and that of the superconducting gap function just below Tc are also evaluated.",

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AB - Anisotropy effects of the gap function on superconducting properties in a 2H-type transition-metal dichalcogenide NbS2 are studied by solving the anisotropic Eliashberg equation with the use of Fermi-surface harmonics. Due to the characteristic dependences on wave vectors of the electron-phonon interaction and renornialized 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 ∑1-phonon modes around q -2/3ΓM are renormalized significantly. The superconducting transition temperature Tc evaluated by solving the anisotropic Eliashberg equation is slightly higher than that evaluated by solving the isotropic Eliashberg equation. Anisotropy of the mass enhancement factor and that of the superconducting gap function just below Tc are also evaluated.

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Anisotropy effects on superconductivity in layered material NbS₂

Abstract

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