Specific Heat of Single Crystal MgB2: A Two-Band Superconductor with Two Different Anisotropies
F. Bouquet, Y. Wang, I. Sheikin, T. Plackowski, A. Junod, S. Lee, S. Tajima
DOI 10.1103/PhysRevLett.89.257001 · Physical Review Letters
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Abstract
Heat-capacity measurements of a 39 μg MgB2 single crystal in fields up to 14 T and below 3 K allow the determination of the low-temperature linear term of the specific heat, its field dependence, and its anisotropy. Our results are compatible with two-band superconductivity, the band carrying the smaller gap being isotropic, that carrying the larger gap having an anisotropy of ∼5. Three different upper critical fields are thus needed to describe the superconducting state of MgB2.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure not reported | unknown |
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