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Quantum oscillations in the mixed state of the type II superconductor 2H-NbSe 2

1994; IOP Publishing; Volume: 6; Issue: 24 Linguagem: Inglês

10.1088/0953-8984/6/24/010

1361-648X

R. Corcoran, P. J. Meeson, Yoshichika Ōnuki, P.-A. Probst, M. Springford, K. Takita, Hisatomo Harima, G. Y. Guo, BL Gyorffy,

Quantum and electron transport phenomena

Quantum oscillations have been investigated far into the mixed state of the type II superconductor 2H-NbSe2. The de Haas-van Alphen effect is found to persist to fields as low as approximately 0.3BC2 and to temperatures of approximately 0.003TC. A self-consistent band structure calculation, performed for 2H-NbSe2 in the normal non-charge-density-wave state using a full potential linearized augmented plane wave (FLAPW) method, accounts well for the experimental angular dependence of the quantum oscillations in terms of a small flat hole Fermi surface around the Gamma point. This feature derives mainly from chalcogen p bands and has a mass-enhancement factor much smaller than expected from the specific heat. Quantum oscillations in the presence of the vortex lattice are observed to experience an additional damping, from which the order parameter is estimated to be Delta (0)=0.6+or-0.1 meV.