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      Critical examination of heat capacity measurements made on a Quantum Design physical property measurement system

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          Partially gapped Fermi surface in the heavy-electron superconductorURu2Si2

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            Heat Capacity Measurements on Small Samples at Low Temperatures

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              Specific Heat of Mg ^{11}B_2

              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
                Cryogenics
                Cryogenics
                Elsevier BV
                00112275
                June 2003
                June 2003
                : 43
                : 6
                : 369-378
                Article
                10.1016/S0011-2275(03)00092-4
                a2dfe082-0ec9-4884-975b-97c8afce6232
                © 2003

                http://www.elsevier.com/tdm/userlicense/1.0/

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