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首页> 外文期刊>Physical review >Generalized phonon density of states of Mo_3SD_7 and Mo_3Sb_(5.4)Te_(1.6) from inelastic neutron scattering and lattice dynamical calculations
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Generalized phonon density of states of Mo_3SD_7 and Mo_3Sb_(5.4)Te_(1.6) from inelastic neutron scattering and lattice dynamical calculations

机译：非弹性中子散射和晶格动力学计算的Mo_3SD_7和Mo_3Sb_（5.4）Te_（1.6）态的广义声子密度

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摘要

The temperature dependence of the generalized phonon density of states (GDOS) of polycrystalline Mo_3Sb_7 and Mo_3Sb_(5.4)Te_(1.6) was studied from 300 K down to 2 K using inelastic neutron scattering. Even though Mo_3Sb_7 undergoes a magnetic as well as a structural phase transition at T* = 53 K, no appreciable change in the recorded spectra has been revealed. The generalized density of states of the nonmagnetic Mo_3Sb_(5.4)Te_(1.6) compound shows.similar main characteristics, though substituting Sb by Te leads to a shift of the entire spectrum towards higher energy. The temperature dependence of the GDOS reveals an anomalous softening of phonons with decreasing temperature in Mo_3Sb_7 which cannot be captured by the harmonic approximation while Mo_3Sb_(54)Te_(1.6) exhibits a normal behavior. This feature might be related to a strong interplay between magnetic excitations and phonons at the core of the anomalous thermal transport displayed by Mo_3Sb_7. In general, the main characteristics of the experimentally derived GDOS of Mo_3Sb_7 can be reproduced by lattice dynamical calculations.
机译：利用非弹性中子散射研究了多晶Mo_3Sb_7和Mo_3Sb_（5.4）Te_（1.6）的广义声子态密度（GDOS）的温度依赖性。即使Mo_3Sb_7在T * = 53 K处经历了磁性以及结构相变，记录的光谱中也没有发现明显的变化。非磁性Mo_3Sb_（5.4）Te_（1.6）化合物的广义态密度显示出相似的主要特征，尽管用Te代替Sb会导致整个光谱向更高的能量移动。 GDOS的温度依赖性揭示了Mo_3Sb_7中温度降低时声子的异常软化，这无法通过谐波近似捕获，而Mo_3Sb_（54）Te_（1.6）则表现出正常行为。此功能可能与Mo_3Sb_7显示的异常热传输核心处的磁激发和声子之间的强烈相互作用有关。通常，可以通过晶格动力学计算来再现实验得出的Mo_3Sb_7 GDOS的主要特征。

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  • 来源
    《Physical review》 |2011年第22期|p.224306.1-224306.8|共8页
  • 作者

    C. Candolfi; B. Lenoir; A. Dauscher; M. M. Koza; M. de Boissieu; M. Sternik; K. Parlinski;

  • 作者单位

    fnstitut Jean Lamour (UMR 7198 CNRS, Nancy Universite, UPV Metz), Ecole Nationale Superieure des Mines de Nancy, Pare de Saurupt, FR-54042 Nancy Cedex, France;

    fnstitut Jean Lamour (UMR 7198 CNRS, Nancy Universite, UPV Metz), Ecole Nationale Superieure des Mines de Nancy, Pare de Saurupt, FR-54042 Nancy Cedex, France;

    fnstitut Jean Lamour (UMR 7198 CNRS, Nancy Universite, UPV Metz), Ecole Nationale Superieure des Mines de Nancy, Pare de Saurupt, FR-54042 Nancy Cedex, France;

    Institut Laue-Langevin, 6 rue Jules Horowitz, Boite Postale 156, FR-38042 Grenoble Cedex 9, France;

    Laboratoire de Science et Ingenierie des Materiaux et Procedes (SIMaP), Grenoble-INP, UJF, CNRS, Boite Postale 75, FR-38402 Saint-Martin-d'He res Cedex, France;

    Institute of Nuclear Physics, Polish Academy of Science, Radzikowskiego 152, PL-3I342 Cracow, Poland;

    Institute of Nuclear Physics, Polish Academy of Science, Radzikowskiego 152, PL-3I342 Cracow, Poland;

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  • 正文语种 eng
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  • 关键词

    neutron inelastic scattering; phonons in crystal lattices;

    机译：中子非弹性散射;晶格中的声子;

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