Specific Heat of Mg ^{11}B_2

Details Specific Heat of Mg ^{11}B_2 Specific Heat of Mg ^{11}B_2

2001-04-11

arxiv.org/abs/cond-mat/0104206v1

Phys. Rev. Lett. 87, 047001 (2001).

Physics

Condensed Matter

Superconductivity

RevTeX-4.0, 4 pages plus 1 page with 3 figures

Scientific paper

10.1103/PhysRevLett.87.047001

Measurements of the specific heat of Mg ^{11}B_2 (MgB2), from 1 to 50 K, in magnetic fields to 9 T, give the Debye temperature, $\Theta$ = 1050 K, the coefficient of the normal-state electron contribution, $\gamma_n$ = 2.6 mJ mol^{-1} K^{-2}, and a discontinuity in the zero-field specific heat of 133 mJ mol^{-1} K^{-1} at $T_c$ = 38.7 K. The estimated value of the electron-phonon coupling parameter, $\lambda$ = 0.62, could account for the observed $T_c$ only if the important phonon frequencies are unusually high relative to $\Theta$. At low $T$, there is a strongly field-dependent feature that suggests the existence of a second energy gap, about four times smaller than the major gap.

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