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Band Jahn-Teller structural phase transition in Y_2In

机译：Y_2In中的Band Jahn-Teller结构相变

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摘要

The number of paramagnetic materials that undergo a structural phase transition is rather small, which can perhaps explain the limited understanding of the band Jahn-Teller mechanism responsible for this effect. Here we present a structural phase transition observed in paramagnetic Y_2In at temperature T_0 = 250 ± 5 K. Below T_0, the high-temperature hexagonal P6_3/mmc phase transforms into the low-temperature orthorhombic Pnma phase. This transition is accompanied by an unambiguous thermal hysteresis of about 10 K. observed in both magnetic susceptibility M/H(T) and resistivity p(T), indicating a first-order transition. Band structure calculations suggest a band Jahn-Teller mechanism, during which the degeneracy of electron bands close to the Fermi energy is broken. We establish that this structural phase transition does not have a magnetic component; however, the possibility of a charge density wave formation has not been eliminated.
机译：经历结构相变的顺磁性材料的数量很少，这也许可以解释对造成这种效应的Jahn-Teller波段机理的有限理解。在这里，我们介绍了在温度T_0 = 250±5 K时在顺磁Y_2In中观察到的结构相变。在T_0以下，高温六角形P6_3 / mmc相转变为低温正交斜Pnma相。在磁化率M / H（T）和电阻率p（T）两者中均观察到约10 K的明确的磁滞现象。能带结构计算提出了能带Jahn-Teller机理，在此过程中打破了接近费米能量的电子带的简并性。我们确定该结构相变不具有磁性成分。然而，尚未消除形成电荷密度波的可能性。

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  • 来源
    《Physical review》 |2018年第5期|054111.1-054111.5|共5页
  • 作者

    E. Svanidze; C. Georgen; A. M. Hallas; Q. Huang; J. M. Santiago; J. W. Lynn; E. Morosan;

  • 作者单位

    Department of Physics and Astronomy and Rice Center for Quantum Materials, Rice University, Houston, Texas 77005, USA;

    Department of Physics and Astronomy and Rice Center for Quantum Materials, Rice University, Houston, Texas 77005, USA;

    Department of Physics and Astronomy and Rice Center for Quantum Materials, Rice University, Houston, Texas 77005, USA;

    NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA;

    Department of Physics and Astronomy and Rice Center for Quantum Materials, Rice University, Houston, Texas 77005, USA;

    NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA;

    Department of Physics and Astronomy and Rice Center for Quantum Materials, Rice University, Houston, Texas 77005, USA;

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