Pressure-induced transition from localized electron toward band antiferromagnetism in LaMnO3 -: art. no. 087201

被引：60

作者：

Zhou, JS ^{[1
]}

Goodenough, JB ^{[1
]}

机构：

[1] Univ Texas, Texas Mat Inst, Austin, TX 78712 USA

来源：

PHYSICAL REVIEW LETTERS | 2002年 / 89卷 / 08期

关键词：

D O I：

10.1103/PhysRevLett.89.087201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The temperature dependence of the ac susceptibility under pressure has been used to track the Neel temperature T-N of the Mott insulators LaMnO3, CaMnO3, and YCrO3. Bloch's rule relating T-N to volume V, viz., alpha=dlogT(N)/dlogV=-3.3, is obeyed in YCrO3 and CaMnO3; it fails in LaMnO3. This breakdown is interpreted to be due to a sharp increase in the factor [U-1+(2Delta)(-1)] entering the superexchange perturbation formula. A first-order change at 7 kbar indicates that the transition from localized-electron to band magnetism is not smooth.

引用

页数：4

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