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Phase transitions of anisotropic and exchange origins in TmFe_5Al_7

机译：TmFe_5Al_7中各向异性和交换原点的相变

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摘要

Magnetization and sound propagation reveal a number of unusual spontaneous and field-induced transformations in ferrimagnetic TmFe_5Al_7 (T_c = 193 K). The rare-earth sublattice was found to provide a uniaxial magnetic anisotropy, whereas the iron sublattice favors an easy-plane anisotropy. A competition between them results in a first-order spin-reorientation transition at 64 K as the magnetic moments rotate from the c axis to the basal plane of a tetragonal structure. The transition is preceded by a first-order magnetization process of type Ⅱ along the hard axis. Remarkably, the intersublattice Tm-Fe exchange interaction is weakened at the spin-reorientation transition. Concomitantly, the spontaneous magnetic moment disappears, and the ferrimagnetic state changes to antiferromagnetic. With increasing temperature, the strength of the Tm-Fe exchange is recovered, and the ferrimagnetism is restored at 82 K through another first-order phase transformation. Below 40 K, a first-order field-induced transition occurs for a magnetic field applied along the easy axis. It reflects a rotation of the magnetic moments towards the forced ferromagnetic state observed above 30 T. Along the hard axis the ferromagnetic saturation is not reached even at 60 T.
机译：磁化和声音传播揭示了亚铁磁TmFe_5Al_7（T_c = 193 K）中许多不寻常的自发和磁场感应的转变。发现稀土亚晶格提供了单轴磁各向异性，而铁亚晶格则有利于易平面各向异性。随着磁矩从c轴旋转到四方结构的基面，它们之间的竞争导致在64 K处发生一阶自旋取向转变。过渡之前是沿硬轴的Ⅱ型一阶磁化过程。值得注意的是，在自旋取向转变时，亚晶间Tm-Fe交换相互作用减弱。随之，自发的磁矩消失，亚铁磁状态变为反铁磁。随着温度的升高，Tm-Fe交换的强度得以恢复，亚铁磁性通过另一个一阶相变而恢复到82K。在40 K以下，沿易轴施加的磁场发生一阶场感应跃迁。它反映了在30 T以上观察到的磁矩向强制铁磁状态的旋转。沿着硬轴，即使在60 T时也未达到铁磁饱和。

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  • 来源
    《Physical review》 |2014年第21期|214417.1-214417.10|共10页
  • 作者

    D. I. Gorbunov; S. Yasin; A. V. Andreev; N. V. Mushnikov; E. V. Rosenfeld; Y. Skourski; S. Zherlitsyn; J. Wosnitza;

  • 作者单位

    Institute of Physics, Academy of Sciences, Na Slovance 2, 182 21 Prague, Czech Republic,Department of Condensed Matter Physics, Charles University, Ke Karlovu 5, 121 16 Prague, Czech Republic;

    Dresden High Magnetic Field Laboratory (HLD), Helmholtz-Zentrum Dresden-Rossendorf, D-01314 Dresden, Germany;

    Institute of Physics, Academy of Sciences, Na Slovance 2, 182 21 Prague, Czech Republic;

    Institute of Metal Physics, Ural Branch of Russian Academy of Sciences, Kovalevskaya 18, 620990 Ekaterinburg, Russia;

    Institute of Metal Physics, Ural Branch of Russian Academy of Sciences, Kovalevskaya 18, 620990 Ekaterinburg, Russia;

    Dresden High Magnetic Field Laboratory (HLD), Helmholtz-Zentrum Dresden-Rossendorf, D-01314 Dresden, Germany;

    Dresden High Magnetic Field Laboratory (HLD), Helmholtz-Zentrum Dresden-Rossendorf, D-01314 Dresden, Germany;

    Dresden High Magnetic Field Laboratory (HLD), Helmholtz-Zentrum Dresden-Rossendorf, D-01314 Dresden, Germany,Institut fuer Festkoerperphysik, TU Dresden, D-01062 Dresden, Germany;

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  • 正文语种 eng
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  • 关键词

    magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.); ferrimagnetics; magnetic anisotropy; acoustical properties of solids;

    机译：磁相边界（包括磁跃迁;超磁性等）;亚铁磁;磁各向异性固体的声学特性;

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