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Structural transition and orbital glass physics in near-itinerant CoV_2O_4

机译：近流CoV_2O_4的结构转变和轨道玻璃物理学

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摘要

The ferrimagnetic spinel CoV_2O_4 has been a topic of intense recent interest, both as a frustrated insulator with unquenched orbital degeneracy and as a near-itinerant magnet which can be driven metallic with moderate applied pressure. Here, we report on our recent neutron diffraction and inelastic scattering measurements on powders with minimal cation site disorder. Our main new result is the identification of a weak ((Δa)/a ～ 10~(-4)), first order structural phase transition at T~* = 90 K, the same temperature where spin canting was seen in recent single crystal measurements. This transition is characterized by a short-range distortion of oxygen octahedral positions, and inelastic data further establish a weak Δ ～ 1.25 meV spin gap at low temperature. Together, these findings provide strong support for the local orbital picture and the existence of an orbital glass state at temperatures below T~*.
机译：铁磁尖晶石CoV_2O_4既是受挫的绝缘体，具有未淬灭的轨道简并性，又是可在中等压力下驱动金属的近等强度磁体，最近引起了人们的极大关注。在这里，我们报告了我们最近对具有最小阳离子位错的粉末进行的中子衍射和非弹性散射测量。我们的主要新结果是确定了弱（（Δa​​）/ a〜10〜（-4）），在T〜* = 90 K时具有一阶结构相变，该温度与最近的单晶中看到的自旋倾斜相同测量。这种转变的特征是氧八面体位置的短程畸变，并且非弹性数据进一步建立了在低温下较弱的Δ〜1.25 meV的自旋间隙。总之，这些发现为当地的轨道图片以及低于T〜*的轨道玻璃状态的存在提供了有力的支持。

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  • 来源
    《Physical review》 |2016年第1期|014437.1-014437.8|共8页
  • 作者

    D. Reig-i-Plessis; D. Casavant; V. O. Garlea; A. A. Aczel; M. Feygenson; J. Neuefeind; H. D. Zhou; S. E. Nagler; G. J. MacDougall;

  • 作者单位

    Department of Physics and the Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA;

    Department of Physics and the Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA;

    Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Chemical and Engineering Materials Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Chemical and Engineering Materials Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA,National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32306-4005, USA;

    Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA,Bredesen Center, University of Tennessee, Knoxville, Tennessee 37996, USA;

    Department of Physics and the Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA;

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