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Specific Heat of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>Mg</mml:mi></mml:mrow><mml:mrow><mml:mn>11</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>B</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>: Evidence for a Second Energy Gap
Measurements of the specific heat of ${\mathrm{Mg}}^{11}{\mathrm{B}}_{2}$ from 1 to 50 K, in magnetic fields to 9 T, give the Debye temperature, $\ensuremath{\Theta}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1050\mathrm{K}$, the coefficient of the normal-state electron contribution, ${\ensuremath{\gamma}}_{n}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}2.6\mathrm{mJ}{\mathrm{mol}}^{\ensuremath{-}1}{\mathrm{K}}^{\ensuremath{-}2}$, and a discontinuity in the zero-field specific heat of $133\mathrm{mJ}{\mathrm{mol}}^{\ensuremath{-}1}{\mathrm{K}}^{\ensuremath{-}1}$ at ${T}_{c}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}38.7\mathrm{K}$. The estimated value of the electron-phonon coupling …