Specific heat of the 38-K superconductor MgB_2 in the normal and superconducting state: bulk evidence for a double gap

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The specific heat of two polycrystalline samples of MgB_2 is presented and analyzed (2 - 300 K, 0 - 16 T), together with magnetic properties. The main characteristics are a low density of states at the Fermi level, high phonon frequencies, and an anomalous temperature- and field- dependence of the specific heat at T < T_c. A two-gap model with a gap ratio of 3:1 fits the specific heat in zero field. The smaller gap is washed out by a field of 0.5 T.
27 pages, 11 figures, chapter for "Studies of High Temperature Superconductors Vol. 38", pdf format

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Superconductivity

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http://salesiana.dossiersoluciones.com/handle/123456789/17905

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0106394
 http://arxiv.org/abs/cond-mat/0106394
 Studies of High Temperature Superconductors Ed. A.V. Narlikar, Nova Science Publishers, Commack, N.Y. 38 (2002) 179

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arXiv