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      Specific Heat of Mg ^{11}B_2

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          Abstract

          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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          Author and article information

          Journal
          11 April 2001
          Article
          10.1103/PhysRevLett.87.047001
          cond-mat/0104206
          475fdc24-51ae-4afb-853a-6820f4880b7d
          History
          Custom metadata
          GiauqueLab-04-11-01
          Phys. Rev. Lett. 87, 047001 (2001).
          RevTeX-4.0, 4 pages plus 1 page with 3 figures
          cond-mat.supr-con

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