title: Fermi surface sheet-dependent superconductivity in 2H-NbSe2.
abstract: High-resolution angle-resolved photoemission spectroscopy was used to study the superconducting energy gap and changes in the spectral function across the superconducting transition in the quasi-two-dimensional superconductor 2H-NbSe2. The momentum dependence of the superconducting gap was determined on different Fermi surface sheets. The results indicate Fermi surface sheet-dependent superconductivity in this low-transition temperature multiband system and provide a description consistent with thermodynamic measurements and the anomalous de Haas-van Alphen oscillations observed in the superconducting phase. The present data suggest the importance of Fermi surface sheet-dependent superconductivity in explaining exotic superconductivity in other multiband systems with complex Fermi surface topology, such as the borides and f-electron superconductors.
authors.affiliation: Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan. yokoya@issp.u-tokyo.ac.jp
authors.forename: T
authors.initials: T
authors.lastname: Yokoya
authors.forename: T
authors.initials: T
authors.lastname: Kiss
authors.forename: A
authors.initials: A
authors.lastname: Chainani
authors.forename: S
authors.initials: S
authors.lastname: Shin
authors.forename: M
authors.initials: M
authors.lastname: Nohara
authors.forename: H
authors.initials: H
authors.lastname: Takagi