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HgSe:Fe—a mixed-valency system and the problem of the ground state

  • Semiconductors and Insulators
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Abstract

The dependence of the electron mobility on the iron impurity content N Fe and temperature is studied for three variants of the ordering of Fe3+ ions in crystalline HgSe:Fe, a weakly correlated gas, states with near ordering like that in a strongly correlated Coulomb liquid, and long-range ordering. The electron mobilities owing to scattering on the correlated system of Fe3+ ions are determined. The temperature dependence of the mobility is analyzed for electron scattering on fluctuations in the charge density in a system of Fe2+-Fe3+ iron ions with mixed valency, and the correlation length is determined. It is shown that the ordering region for the Fe3+ ions encompasses only the first coordination sphere, i.e., near ordering in the position of the Fe3+ ions is established, as in a liquid. The coupling between the ordering of the Fe3+ ions and the formation of a correlation gap in the density of impurity d-states and its effect on the low-temperature behavior of the electron mobility in HgSe:Fe crystals are examined.

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Authors and Affiliations

  1. Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, 620219, Ekaterinburg, Russia

    I. G. Kuleev

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  1. I. G. Kuleev
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Fiz. Tverd. Tela (St. Petersburg) 40, 425–432 (March 1998)

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Kuleev, I.G. HgSe:Fe—a mixed-valency system and the problem of the ground state. Phys. Solid State 40, 389–395 (1998). https://doi.org/10.1134/1.1130330

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  • DOI: https://doi.org/10.1134/1.1130330

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