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- W2003996852 abstract "Heat-capacity measurements have been made from 5 to 330 K on NiS which shows a nonmetal-metal transition at 265 K, and on ${mathrm{Ni}}_{0.95}$S which is metallic at all temperatures. The low-temperature data yield electronic specific-heat coefficients of 0.9 ifmmodepmelsetextpmfi{} 0.2 and 6.2 ifmmodepmelsetextpmfi{} 0.4 mJ/mole ${mathrm{K}}^{2}$ and characteristic temperatures of 373 and 336 K, respectively. We deduce that NiS is a semimetal, not a semiconductor, at low temperatures. Of the entropy of transition, 5.32 J/mole K, 25% is electronic and 75% is due to the lattice. Any magnetic contribution is small compared to $Rmathrm{ln}(2S+1)$. The entropy of transition is proportional to the transition temperature ${T}_{t}$ for a series of samples with $105<{T}_{t}<315$ K. A strong electron-phonon interaction is indicated. Structure in the specific-heat anomaly of tiny crystals (ensuremath{sim} 1 mg) is ascribed to the presence of domains of dimensions ensuremath{sim} 100 ensuremath{mu}m with slightly different stoichiometries." @default.
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- W2003996852 title "Heat capacity of nickel sulfide and its semimetal-metal transition" @default.
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- W2003996852 doi "https://doi.org/10.1103/physrevb.11.671" @default.
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