Fermi surface sheet-dependent superconductivity in 2H-NbSe2.
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.
Yokoya
T
T
Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan. yokoya@issp.u-tokyo.ac.jp
Kiss
T
T
Chainani
A
A
Shin
S
S
Nohara
M
M
Takagi
H
H