Specific heat of Mg 11B 2

We report specific-heat measurements on two samples of Mg 11B 2, one powder and one sintered, that give essentially identical results. Both samples are of exceptionally high quality: At the critical temperature the discontinuity in specific heat is higher than that of other samples, the transition i...

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Bibliographic Details
Published inPhysica. C, Superconductivity Vol. 385; no. 1; pp. 180 - 191
Main Authors Fisher, R.A., Li, Guangtao, Lashley, J.C., Bouquet, F., Phillips, N.E., Hinks, D.G., Jorgensen, J.D., Crabtree, G.W.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 2003
Subjects
Multi-gap superconductivity
Phonons
Specific heat
Vortices
74.25.Bt
Specific heat
74.60.Ec
Vortices
Phonons
Multi-gap superconductivity
75.40.Cx
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Summary:We report specific-heat measurements on two samples of Mg 11B 2, one powder and one sintered, that give essentially identical results. Both samples are of exceptionally high quality: At the critical temperature the discontinuity in specific heat is higher than that of other samples, the transition is sharper than for most samples, and the signature feature of the small, non-BCS energy gap is particularly pronounced. The results are compared with a phenomenological model for a multi-gap superconductor, with band-structure calculations, and with spectroscopic determinations of the energy gaps.
ISSN:0921-4534
1873-2143
DOI:10.1016/S0921-4534(02)02316-X