Specific heat of single crystal MgB_2: a two-band superconductor with two different anisotropies

Details Specific heat of single crystal MgB_2: a two-band superconductor with two different anisotropies Specific heat of single crystal MgB_2: a two-band superconductor with two different anisotropies

2002-07-04

arxiv.org/abs/cond-mat/0207141v3

Phys. Rev. Lett. 89, 257001 (2002)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures - V2: Bibliography updated and some typo corrected. One reference added - V3: version accepted for publicat

Scientific paper

10.1103/PhysRevLett.89.257001

Heat-capacity measurements of a 39 microgramm MgB_2 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 small gap being isotropic, that carrying the large gap having an anisotropy of ~ 5. Three different upper critical fields are thus needed to describe the superconducting state of MgB2.

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