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

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

2001-06-20

arxiv.org/abs/cond-mat/0106394v1

Studies of High Temperature Superconductors Ed. A.V. Narlikar, Nova Science Publishers, Commack, N.Y. 38 (2002) 179

Physics

Condensed Matter

Superconductivity

27 pages, 11 figures, chapter for "Studies of High Temperature Superconductors Vol. 38", pdf format

Scientific paper

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.

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