Theory of metal-insulator transition in PrFe4P12 and PrRu4P12

被引：12

作者：

Curnoe, SH

Ueda, K

Harima, H

Takegahara, K

机构：

[1] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan

[2] Japan Atom Energy Res Inst, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan

[3] Osaka Univ, Inst Sci & Ind Res, Ibaraki, Osaka 5670047, Japan

[4] Hirosaki Univ, Dept Mat Sci & Technol, Hirosaki, Aomori 0368561, Japan

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2002年 / 63卷 / 6-8期

基金：

日本学术振兴会;

关键词：

crystal structure; electronic structure; fermi surface; magnetic properties; phase transitions;

D O I：

10.1016/S0022-3697(02)00150-6

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We derive all symmetry allowed couplings between Fe/Ru or P ion displacements and the Pr ion 4f(2) ground state doublet in PrFe4P12 and PrRu4P12. A (1,1, - 2)-type distortion of the Fe/Ru positions splits the 4f(2) doublet into non-magnetic eigenstates with opposite quadrupole moments. The sign of both the distortion and the quadrupole moment alternate from site to site, resulting in anti-quadrupolar ordering. A (1, 1, 1)-type distortion does not lift the degeneracy of the 4f(2) doublet. Either distortion may also open a gap at the Fermi surface, causing a metal-insulator transition in PrRu4P12 and a partial metal-insulator transition in PrFe4P12. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：1207 / 1210

页数：4

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