当前位置: X-MOL 学术Phys. Rev. B › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Finite-temperature properties of rare-earth iron garnets in a magnetic field
Physical Review B ( IF 3.2 ) Pub Date : 
Davis Campbell, Changsong Xu, Temuujin Bayaraa, L. Bellaiche

An ab-initio scheme is developed and used to investigate finite-temperature properties of a prototype of the complex rare earth - iron garnets, namely Gd3Fe5O12 (that is, possessing Gadolinium as its rare-earth ion), under applied magnetic fields. It is found that such a system undergoes a field-induced transition at a critical temperature, Trev, at which all magnetic ions revert the direction of their spins. This Trev critical temperature is well seen via a peak in the specific heat-versus-temperature curve under field and depends on different magnetic field’s magnitude regimes: () for fields up to about 20T, it is field-independent, rather sudden, and coincides with the so-called compensation temperature, TM~ 286 K, at which the sum of all local magnetic moments is annihilated; (2) for fields larger than 70T, there is no more full cancellation of these local magnetic moments for any temperature and Trev is also field-independent but now occurring via rotation of the local magnetic moments and at a temperature smaller from the zero-field TM by about 100K; and (3) for intermediate fields ranging between 20T and 70T, T$_{rev\thinspace }$is now field-dependent and decreases with the field’s magnitude while also being associated with a rotation of these local magnetic moments. Our calculations also highlight the predominant role of the spins of the Gd ions on all these effects. bf …

中文翻译:

磁场中稀土铁石榴石的有限温度特性

开发了一个从头算方案,并用于研究复杂稀土-铁石榴石原型的有限温度特性,即 Gd3FË5Ø12(即,以d为稀土离子)在磁场作用下。发现这种系统在临界温度T下经历了场致跃迁[RËv,所有的磁性离子都将其自旋方向还原。这个T[RËv 通过磁场下特定热-温度曲线的峰值可以清楚地看到临界温度,并且取决于不同磁场的大小范围:()对于高达20T的磁场,它与电场无关,相当突然,并且与所谓补偿温度,T中号〜286 K,所有局部磁矩之和被消除;(2)对于大于70T的磁场,在任何温度和T下都无法完全抵消这些局部磁矩[RËv 也是与磁场无关的,但现在是通过局部磁矩的旋转并且在比零磁场T小的温度下发生的中号大约十万;(3)对于介于20T和70T之间的中间磁场,T $ _ {rev \ thinspace} $现在与磁场有关,并且随着磁场的大小而减小,同时还与这些局部磁矩的旋转有关。我们的计算还强调了Gd离子自旋在所有这些效应中的主要作用。bf…
更新日期:2020-09-21
down
wechat
bug