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Magnetic properties of FeAl_2 and Fe_2Al_5

机译：FeAl_2和Fe_2Al_5的磁性

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摘要

We have investigated magnetic properties of the FeAl_2 and Fe_2Al_5 intermetallic compounds. By measuring the zero-field-cooled and field-cooled static (dc) magnetic susceptibilities in low and high magnetic fields, the frequency-dependent (ac) susceptibility, the magnetization versus the magnetic field, and the thermoremanent magnetization time decay, we found that the magnetic structures of FeAl_2 and Fe_2Al_5 are richer than those published so far in the literature. FeAl_2 undergoes complex two-step magnetic ordering. At T ≈ 32 K, a magnetic phase transition (not yet specified) takes place in which a small fraction of the Fe spins participate, whereas at Tn ≈ 12 K, the majority spin fraction undergoes a spin-freezing transition to a spin glass phase. Fe_2Al_5 undergoes a transition to a spin glass phase at the spin freezing temperature Tf ≈ 3 K, which was not reported previously. The spin glass phase in Fe_2Al_5 is "soft" and fragile with respect to the external magnetic field and can only be observed in low magnetic fields below ~100 Oe. The origins of the spin glass ordering in the FeAl_2 and Fe_2Al_5 phases are randomness and frustration that are present on the Fe sublattices of both compounds. In FeAl_2, the Fe spins are positioned randomly on the three mixed-occupation Al/Fe sites of the unit cell, whereas in Fe_2Al_5, partial occupation of the Fe-neighboring A12 and A13 atomic sites imposes different degrees of Fe moment screening by the electron cloud, resulting in a random distribution of the magnetic moment sizes. Geometric frustration because of positioning of the antiferromagnetically coupled Fe spins on triangles is present in both compounds as well.
机译：我们已经研究了FeAl_2和Fe_2Al_5金属间化合物的磁性。通过测量在低磁场和高磁场中的零磁场冷却和磁场冷却的静磁化率（dc），随频率变化的（ac）磁化率，磁化强度与磁场的关系以及热剩磁化时间的衰减，我们发现FeAl_2和Fe_2Al_5的磁性结构比文献中迄今发表的丰富。 FeAl_2经历了复杂的两步磁性排序。在T≈32 K时，发生磁性相变（未指定），其中一小部分的Fe自旋参与，而在Tn≈12 K时，大部分自旋部分经历了自旋冻结转变为自旋玻璃相。 。 Fe_2Al_5在自旋凝固温度Tf≈3 K时经历了向自旋玻璃相的转变，这以前没有报道。 Fe_2Al_5中的自旋玻璃相相对于外部磁场是“软”且易碎的，只能在低于100 Oe的低磁场中观察到。 FeAl_2和Fe_2Al_5相中自旋玻璃有序的起源是两种化合物的Fe亚晶格上存在的无规性和无奈性。在FeAl_2中，Fe自旋随机地位于晶胞的三个混合占据的Al / Fe位点上，而在Fe_2Al_5中，相邻的Fe原子A12和A13原子位点的部分占据对电子施加的Fe矩屏蔽程度不同。云，导致磁矩大小的随机分布。在两种化合物中也都存在由于将反铁磁耦合的Fe自旋定位在三角形上而导致的几何变形。

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  • 来源
    《Physical review》 |2011年第22期|p.224427.1-224427.13|共13页
  • 作者

    Z. Jaglicic; S. Vrtnik; M. Feuerbacher; J. Dolinsek;

  • 作者单位

    Institute of Mathematics, Physics and Mechanics & University of Ljubljana, Faculty of Civil and Geodetic Engineering,Jamova 2, SI-1000 Ljubljana, Slovenia;

    Jozef Stefan Institute & University of Ljubljana, Faculty of Mathematics and Physics, Jamova 39, SI-1000 Ljubljana, Slovenia;

    Institut fuer Festkoerperforschung, Forschungszentrum Juelich, D-52425 Juelich, Germany;

    Jozef Stefan Institute & University of Ljubljana, Faculty of Mathematics and Physics, Jamova 39, SI-1000 Ljubljana, Slovenia,EN-FIST Centre of Excellence, Dunajska 156, SI-1000 Ljubljana, Slovenia;

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    spin glasses and other random magnets; metals and alloys; quasicrystals;

    机译：旋转眼镜和其他随机磁铁;金属和合金;准晶体;

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