Volume dependence of the magnetic coupling in LaFe13−xSix based compounds
Volume dependence of the magnetic coupling in LaFe13−xSix based compounds
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DOI：
10.1063/1.2894194
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发表时间：
2008-03
影响因子：
4
通讯作者：
L. Jia;Jirong Sun;Feixiang Wang;T. Zhao;H. Zhang;B. Shen;Dexin Li;S. Nimori;Yang Ren;
中科院分区：
文献类型：
--
作者：
L. Jia;Jirong Sun;Feixiang Wang;T. Zhao;H. Zhang;B. Shen;Dexin Li;S. Nimori;Yang Ren;
对于LaFe13−xSix (x= 1.3-2.1)，已经系统地研究了压力和氢化的影响，前者导致晶格收缩，后者导致样品膨胀。结果表明，在~ 1.6H∕f.u时，居里温度的典型变化为~ 150K。当压力从0到1gpa扫过时，被吸收和~ - 106K。本工作最显著的结果之一是居里温度和相体积之间存在普遍的关系。前者随晶格常数（~ 1510K∕A）的增加而线性增长，与相体积如何改变无关。这一结果表明，LaFe13−xSix中的磁偶联完全依赖于Fe-Fe距离，而间隙氢不影响化合物的电子结构。
The effects of pressure and hydrogenation, the former causes a lattice contraction while the latter causes an expansion of the sample, have been systematically studied for LaFe13−xSix (x=1.3–2.1). It is found that the typical change of the Curie temperature is ∼150K when ∼1.6H∕f.u. is absorbed and ∼−106K as the pressure sweeps from 0to1GPa. One of the most remarkable results of the present work is the presence of a universal relation between Curie temperature and phase volume. The former linearly grows with the increase of lattice constant (∼1510K∕A), irrespective of how the phase volume is modified. This result implies the exclusive dependence of the magnetic coupling in LaFe13−xSix on the Fe–Fe distances and the interstitial hydrogen does not affect the electronic structure of the compounds.