Physics – Condensed Matter – Superconductivity
Scientific paper
2007-12-18
Physical Review B 76, 212504 (2007)
Physics
Condensed Matter
Superconductivity
16 pages, 4 figures
Scientific paper
10.1103/PhysRevB.76.212504
To resolve the discrepancies of the superconducting order parameter in quasi-two-dimensional NbSe_2, comprehensive specific-heat measurements have been carried out. By analyzing both the zero-field and mixed-state data with magnetic fields perpendicular to and parallel to the c axis of the crystal and using the two-gap model, we conclude that (1) more than one energy scale of the order parameter is required for superconducting NbSe_2 due to the thermodynamic consistency; (2)delta_L=1.26 meV and delta_S=0.73 meV are obtained; (3) N_S(0)/N(0)=11%~20%; (4) The observation of the kink in gamma(H) curve suggests that the two-gap scenario is more favorable than the anisotropic s-wave model to describe the gap structure of NbSe_2; and (5)delta_S is more isotropic and has a three-dimensional-like feature and is located either on the Se or the bonding Nb Fermi sheets.
Berger Heinz
Chang Y. T.
Chou Catherine
huang Chia-Ling
Lee Timothy K.
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