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- W2312964384 abstract "We report results of electrical-conductivity, thermoelectric-power, and optical experiments on single crystals of ${mathrm{Ni}}_{1ensuremath{-}x}{mathrm{Co}}_{x}{mathrm{S}}_{2}$ ($0ensuremath{le}xensuremath{le}0.12$). The results cannot be explained by means of a conventional one-electron model. However, if it is assumed that both strong electronic correlations and strong electron-phonon coupling exists for electrons in the narrow $d$ bands associated with the transition-metal cations, the experimental results can be understood quantitatively. In the model presented, Ni${mathrm{S}}_{2}$ is a Mott insulator, in which the gap is due to a correlation splitting of the $3densuremath{-}{e}_{g}$ band. The introduction of Co substitutionally for Ni results in one hole per Co atom in the lower of these bands. However, strong electron-phonon coupling leads to small-polaron formation, and thus a drastic band narrowing with increasing temperature. For this range of $x$, the $d$-band holes conduct only by means of thermally activated hopping for temperatures above 100 K. Screening effects due to thermally excited carriers lead to a collapse of the energy gap at a critical temperature, but small-polaron hopping remains the predominant conduction mechanism." @default.
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- W2312964384 title "Electrical properties of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Ni</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Co</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>S</mml:mi></mml:mrow><…" @default.
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