Low Field Anomaly in the Specific Heat of s -Wave Superconductors due to the Expansion of the Vortex Cores
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
- Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506-0055 (United States)
The magnetic field dependence of the electronic specific heat C(H) in the s -wave superconductor NbSe{sub 2} shows curvature at low fields, resembling the near {radical}(H) term in C(H) which has been reported in high-T{sub c} superconductors and attributed to a d{sub x{sup 2}{minus}y{sup 2}} -wave pairing state. In NbSe{sub 2} we find that the low field behavior in C(H) is described quantitatively by the expansion of vortex cores and the field dependence of the magnetic induction B above H{sub c1} . The associated change in the density of quasiparticle states localized in the vortex cores provides a simple explanation for the {open_quotes}low field anomaly{close_quotes} in C(H) observed in s -wave superconductors. {copyright} {ital 1999} {ital The American Physical Society}
- OSTI ID:
- 345450
- Journal Information:
- Physical Review Letters, Vol. 82, Issue 24; Other Information: PBD: Jun 1999
- Country of Publication:
- United States
- Language:
- English
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