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首页> 外文期刊>Physical review >Structural and magnetic properties in the quantum S = 1/2 dimer system Ba_3(Cr_(1-x)V_x)_2O_8 with site disorder
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Structural and magnetic properties in the quantum S = 1/2 dimer system Ba_3(Cr_(1-x)V_x)_2O_8 with site disorder

机译:量子S = 1/2二聚体系统Ba_3(Cr_(1-x)V_x)_2O_8的结构和磁性

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摘要

We report a comprehensive study of dc susceptibility, specific-heat, neutron-diffraction, and inelastic neutron-scattering measurements on polycrystalline Ba_3(Cr_(1-x)V_x)_2O_8 samples, where x = 0, 0.06, 0.15, and 0.53. A Jahn-Teller structure transition occurs for x = 0, 0.06, and 0.15 samples, and the transition temperature is reduced upon vanadium substitution from 70(2) K at x = 0 to 60(2) K at x = 0.06 and 0.15. The structure becomes less distorted as x increases, and such transition disappears at x = 0.53. The observed magnetic excitation spectrum indicates that the singlet ground state remains unaltered and spin-gap energy △ = 1.3(1) meV is identical within the instrument resolution for all x. In addition, the dispersion bandwidth W decreases with increase of x. At x = 0.53, W is reduced to 1.4(1) meV from 2.0(1) meV at x = 0.
机译:我们报告了对多晶Ba_3(Cr_(1-x)V_x)_2O_8样品的直流磁化率,比热,中子衍射和非弹性中子散射测量的综合研究,其中x = 0、0.06、0.15和0.53。 x = 0、0.06和0.15样品发生Jahn-Teller结构转变,钒取代后,转变温度从x = 0的70(2)K降低到x = 0.06和0.15的60(2)K。随着x的增加,结构变得更少失真,并且这种转变在x = 0.53时消失。观测到的磁激发光谱表明,单重态基态保持不变,并且对于所有x,自旋间隙能量△= 1.3(1)meV在仪器分辨率内​​是相同的。另外,色散带宽W随着x的增加而减小。在x = 0.53时,W从x = 0时的2.0(1)meV降至1.4(1)meV。

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  • 来源
    《Physical review》 |2013年第14期|144427.1-144427.9|共9页
  • 作者单位

    Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393, USA;

    Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA;

    Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393, USA,Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA;

    Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393, USA;

    Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA,Department of Materials and Engineering, University of Maryland, College Park, Maryland 20742, USA;

    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Sendai 980-8577, Japan;

    Neutron Science Laboratory, Institute for Solid State Physics, University of Tokyo, 106-1 Shirakata, Tokai, Ibaraki 319-1106, Japar,;

    Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA;

    Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393, USA;

    Neutron Data Analysis and Visualization Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393, USA;

    Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32306-4005, USA,Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1200, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    quantized spin models; antiferromagnetics;

    机译:量化自旋模型反铁磁;

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