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ON THE ROTATING MAGNETOCALORIC EFFECT IN MULTIFERROIC RMn_2O_5 COMPOUNDS

机译:多价RMn_2O_5化合物的旋转磁热效应

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摘要

Thanks to the strong magnetic anisotropy shown by RMn2O5 compounds, a large magnetocaloric effect canrnbe induced (around 10 K) by rotating them in constant magnetic fields instead the standard magnetizationdemagnetizationrnmethod. Particularly, the TbMn2O5 single crystal reveals a giant rotating magnetocaloricrneffect (RMCE) under relatively low constant magnetic fields reachable by permanent magnets. On the otherrnhand, it was found that the RMCE in RMn2O5 crystals strongly depends on the R3+ ion nature. Under arnconstant magnetic field of 2 T, the maximum rotating adiabatic temperature change exhibited by TbMn2O5 isrnmore than 5 times larger than that presented by HoMn2O5. The rare earth ion size could play a crucial role inrnthe determination of the magnetic and magnetocaloric properties of RMn2O5 compounds through thernmodulation of exchange interactions via lattice distortions, a scenario that seems to be supported by Ramanrnscattering.
机译:由于RMn2O5化合物表现出很强的磁各向异性,通过在恒定磁场中旋转它们而不是标准的磁化去磁方法可以诱导大的磁热效应(约10 K)。特别是,TbMn2O5单晶在永磁体可达到的相对较低的恒定磁场下显示出巨大的旋转磁热效应(RMCE)。另一方面,发现RMn2O5晶体中的RMCE强烈依赖于R3 +离子的性质。在2 T的恒定磁场下,TbMn2O5表现出的最大旋转绝热温度变化是HoMn2O5表现出的最大绝热温度变化的5倍以上。稀土离子的大小可能通过晶格畸变对交换相互作用的调制来确定RMn2O5化合物的磁性和磁热性质,这可能起着至关重要的作用,拉曼散射似乎支持了这种情况。

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  • 会议地点 Turin(IT)
  • 作者单位

    Département de Physique ,Université de Sherbrooke,J1K 2R1, QC, Canada E-mail: mohamed.balli@usherbrooke.ca;

    Département de Physique ,Université de Sherbrooke,J1K 2R1, QC, Canada;

    Département de Physique ,Université de Sherbrooke,J1K 2R1, QC, Canada;

    Département de Physique ,Université de Sherbrooke,J1K 2R1, QC, Canada;

    Département de Physique ,Université de Sherbrooke,J1K 2R1, QC, Canada Canadian Institute For Advanced Research, Ontario M5G 1Z8, Canada;

    Institute of Solid state Physics, Bulgarian Academy of Science, Sofia 1184, Bulgaria Institute of Optical Materials and Technologies, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria;

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

    RMn_2O_5; Multiferroics; Anisotropy; Single crystals; Magnetocaloric effect;

    机译:RMn_2O_5 ;;多铁;各向异性;单晶;磁热效应;

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