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Remarkable low-energy properties of the pseudogapped semimetal Be_5Pt

机译：伪变性半型BE_5PT的显着低能量特性

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摘要

We report measurements and calculations on the properties of the intermetallic compound Be_5Pt. High-quality polycrystalline samples show a nearly constant temperature dependence of the electrical resistivity over a wide temperature range. On the other hand, relativistic electronic structure calculations indicate the existence of a narrow pseudogap in the density of states arising from accidental approximate Dirac cones extremely close to the Fermi level. A small true gap of order ～3 meV is present at the Fermi level, yet the measured resistivity is nearly constant from low to room temperature. We argue that this unexpected behavior can be understood by a cancellation of the energy dependence of density of states and relaxation time due to disorder, and discuss a model for electronic transport. With applied pressure, the resistivity becomes semiconducting, consistent with theoretical calculations that show that the bandgap increases with applied pressure. We further discuss the role of Be inclusions in the samples.
机译：我们报告对金属间化合物BE_5PT的性质的测量和计算。高质量的多晶样品在宽温度范围内显示出电阻率的几乎恒定的温度依赖性。另一方面，相对论的电子结构计算表明，在极近费米水平非常接近Fermi水平的意外近似DIRAC锥体的态度中存在窄伪影像。在FERMI水平上存在〜3 mev的小真正间隙，但测得的电阻率几乎恒定从低到室温。我们认为，通过取消状态密度和由于紊乱的放松时间的能量依赖性，可以理解这种意外行为，并讨论电子运输模型。通过施加压力，电阻率成为半导体，与理论计算一致，表明带隙随着施加的压力增加。我们进一步讨论了样品中包含的作用。

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  • 来源
    《Physical review》 |2020年第15期|155206.1-155206.11|共11页
  • 作者

    Laura Funfarillo; J. J. Hamlin; R. G. Hennig; Ajinkya C. Hire; P. J. Hirschfeld; Jungsoo Kim; Jinhyuk Lim; Yundi Quan; G. R. Stewart; Stephen R. Xie;

  • 作者单位

    Department of Physics University of Florida Gainesville Florida 32611 USA Scuola Internazionale Superiore di Studi Avanzati (SISSA) Via Bonomea 265 1-34136 Trieste Italy;

    Department of Physics University of Florida Gainesville Florida 32611 USA;

    Department of Materials Science and Engineering University of Florida Gainesville Florida 32611 USA Quantum Theory Project University of Florida Gainesville Florida 32611 USA;

    Department of Materials Science and Engineering University of Florida Gainesville Florida 32611 USA Quantum Theory Project University of Florida Gainesville Florida 32611 USA;

    Department of Physics University of Florida Gainesville Florida 32611 USA;

    Department of Physics University of Florida Gainesville Florida 32611 USA;

    Department of Physics University of Florida Gainesville Florida 32611 USA;

    Department of Physics University of Florida Gainesville Florida 32611 USA Department of Materials Science and Engineering University of Florida Gainesville Florida 32611 USA Quantum Theory Project University of Florida Gainesville Florida 32611 USA;

    Department of Physics University of Florida Gainesville Florida 32611 USA;

    Department of Materials Science and Engineering University of Florida Gainesville Florida 32611 USA Quantum Theory Project University of Florida Gainesville Florida 32611 USA;

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