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<p>The recently discovered giant temperature hysteresis of the electrical resistance in EuTe<sub>4</sub> is the largest for crystalline solids, but its mechanism remains a mystery. In this work, this hysteresis in EuTe<sub>4</sub> has been explained by the interplay between two electronic instabilities: band anticrossing (repulsion) at the Fermi level and the charge density wave. By calculating the electronic susceptibility and its temperature dependence with the wave vector of the charge density wave with and without band anticrossing, the width of the temperature hysteresis observed in measurements of the electrical resistance in EuTe<sub>4</sub> has been estimated. These calculations require consideration of the contributions of different combinations of Fermi-crossing bands arising from the mono- and bilayer <i>p</i>-orbitals of tellurium.</p>

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On the Nature of the Giant Temperature Hysteresis in Rare Earth Metal Tetratellurides

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  • 发表日期：

    2026年3月1日

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  • A. A. Morocho,
  • P. D. Grigoriev

摘要

The recently discovered giant temperature hysteresis of the electrical resistance in EuTe4 is the largest for crystalline solids, but its mechanism remains a mystery. In this work, this hysteresis in EuTe4 has been explained by the interplay between two electronic instabilities: band anticrossing (repulsion) at the Fermi level and the charge density wave. By calculating the electronic susceptibility and its temperature dependence with the wave vector of the charge density wave with and without band anticrossing, the width of the temperature hysteresis observed in measurements of the electrical resistance in EuTe4 has been estimated. These calculations require consideration of the contributions of different combinations of Fermi-crossing bands arising from the mono- and bilayer p-orbitals of tellurium.