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Lattice dynamics and anomalous softening in the YbFe_4Sb_(12) skutterudite

机译:YbFe_4Sb_(12)方钴矿中的晶格动力学和异常软化

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摘要

The lattice dynamics of the filled skutterudite YbFe_4Sb_(12) was studied by resonant ultrasound spectroscopy and an anomalous softening in the temperature dependence of the elastic constants at ~50 K was observed. This anomaly can not be explained by the dynamics of the filler, in contrast to other filled skutterudites. We have further investigated the origin of this anomaly using macroscopic and microscopic measurements. A rearrangement of the spectral weight of the Yb phonon states was observed in the temperature dependence of the density of phonon states, obtained by inelastic neutron scattering. We suggest that the anomaly is due to a change of the Yb valence state and that the anomaly and the phonon spectral weight rearrangement have the same origin.
机译:通过共振超声光谱研究了填充方钴矿YbFe_4Sb_(12)的晶格动力学,观察到〜50 K时弹性常数对温度的依赖性出现异常软化。与其他填充的方钴矿相比,这种异常无法用填充物的动力学来解释。我们使用宏观和微观测量方法进一步研究了这种异常的起源。在通过非弹性中子散射获得的声子态密度的温度依赖性中,观察到Yb声子态的谱重的重排。我们认为异常是由于Yb价态的变化引起的,并且异常和声子谱重重排具有相同的起源。

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  • 来源
    《Physical review》 |2011年第18期|p.184306.1-184306.9|共9页
  • 作者单位

    Juelich Centre for Neutron Science JCNS and Peter Gruenberg Institut PGI, JARA-FIT, Forschungszentrum Juelich GmbH,DE-52425 Juelich, Germany,Faculte des Sciences, Universite de Liege, BE-4000 Liege, Belgium;

    European Synchrotron Radiation Facility, FR-38043 Grenoble Cedex, France;

    Deutsches Elektmnen-Synchrotron, DE-22607 Hamburg, Germany;

    Juelich Centre for Neutron Science JCNS and Peter Gruenberg Institut PGI, JARA-FIT, Forschungszentrum Juelich GmbH,DE-52425 Juelich, Germany;

    Juelich Centre for Neutron Science JCNS and Peter Gruenberg Institut PGI, JARA-FIT, Forschungszentrum Juelich GmbH,DE-52425 Juelich, Germany;

    Neutron Scattering Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393, USA;

    Department of Physics, Tbilisi State University, GE-0128 Tbilisi, Georgia;

    Department of Physics, Tbilisi State University, GE-0128 Tbilisi, Georgia;

    Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA;

    Juelich Centre for Neutron Science JCNS and Peter Gruenberg Institut PGI, JARA-FIT, Forschungszentrum Juelich GmbH,DE-52425 Juelich, Germany,Faculte des Sciences, Universite de Liege, BE-4000 Liege, Belgium;

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  • 关键词

    thermoelectric and thermomagnetic effects;

    机译:热电和热磁效应;

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