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Elasticity and magnetocaloric effect in MnFe_4Si_3

机译:MnFe_4Si_3中的弹性和磁热效应

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摘要

The room temperature magnetocaloric material MnFe_4Si_3 was investigated with nuclear inelastic scattering (NIS) and resonant ultrasound spectroscopy (RUS) at different temperatures and applied magnetic fields in order to assess the influence of the magnetic transition and the magnetocaloric effect on lattice dynamics. The NIS data give access to phonons with energies above 3 meV, whereas RUS probes the elasticity of the material in the MHz frequency range and thus low-energy, ~ neV, phonon modes. A significant influence of the magnetic transition on the lattice dynamics is observed only in the low-energy, long-wavelength limit. MnFe_4Si_3 and other compounds in the Mn_(5-x)Fe_xSi_3 series were also investigated with vibrating sample magnetometry, resistivity measurements, and Mossbauer spectroscopy in order to study the magnetic transitions and to complement the results obtained on the lattice dynamics.
机译:室温磁热材料MnFe_4Si_3用核非弹性散射(NIS)和共振超声光谱(RUS)在不同温度和外加磁场下进行了研究,以评估磁跃迁和磁热效应对晶格动力学的影响。 NIS数据可以访问能量高于3 meV的声子,而RUS则可以在MHz频率范围内探测材料的弹性,从而探测低能〜neV的声子模式。仅在低能量,长波长范围内才能观察到磁跃迁对晶格动力学的重大影响。 MnFe_4Si_3和Mn_(5-x)Fe_xSi_3系列中的其他化合物也通过振动样品磁力分析,电阻率测量和Mossbauer光谱学进行了研究,以研究磁性跃迁并补充晶格动力学的结果。

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  • 来源
    《Physical review》 |2016年第9期|094304.1-094304.10|共10页
  • 作者单位

    FS-PE, Deutsches Elektronen-Synchrotron (DESY), D-22607 Hamburg, Germany,Juelich Centre for Neutron Science JCNS and Peter Gruenberg Institut PGI, JARA-FIT, Forschungszentrum Juelich GmbH, D-52425 Juelich, Germany,Faculte des Sciences, Universite de Liege, B-4000 Liege, Belgium;

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

    FS-PE, Deutsches Elektronen-Synchrotron (DESY), D-22607 Hamburg, Germany;

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

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

    Juelich Centre for Neutron Science JCNS and Peter Gruenberg Institut PGI, JARA-FIT, Forschungszentrum Juelich GmbH, D-52425 Juelich, Germany,Faculte des Sciences, Universite de Liege, B-4000 Liege, Belgium,Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

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