title: Pressure induced effects on the Fermi surface of superconducting 2H-NbSe2.
abstract: The pressure dependence of the critical temperature T(c) and upper critical field H(c2)(T) has been measured up to 19 GPa in the layered superconducting material 2H-NbSe2. T(c)(P) has a maximum at 10.5 GPa, well above the pressure for the suppression of the charge density wave (CDW) order. Using an effective two-band model to fit H(c2)(T), we obtain the pressure dependence of the anisotropy in the electron-phonon coupling and Fermi velocities, which reveals the peculiar interplay between CDW order, Fermi surface complexity, and superconductivity in this system.
authors.affiliation: Laboratorio de Bajas Temperaturas, Departamento de Física de la Materia Condensada, Instituto de Ciencia de Materiales Nicolás Cabrera, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
authors.forename: H
authors.initials: H
authors.lastname: Suderow
authors.forename: V G
authors.initials: VG
authors.lastname: Tissen
authors.forename: J P
authors.initials: JP
authors.lastname: Brison
authors.forename: J L
authors.initials: JL
authors.lastname: Martínez
authors.forename: S
authors.initials: S
authors.lastname: Vieira