Spin order due to orbital fluctuations: Cubic vanadates

被引：166

作者：

Khaliullin, G

Horsch, P

Oles, AM

机构：

[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

[2] Jagiellonian Univ, Inst Phys, PL-30059 Krakow, Poland

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 86卷 / 17期

关键词：

D O I：

10.1103/PhysRevLett.86.3879

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the highly frustrated spin and orbital superexchange interactions in cubic vanadates. The fluctuations of t(2g) orbitals trigger a novel mechanism of ferromagnetic interactions between spins S = 1 of V3+ ions along one of the cubic directions which operates already in the absence of Hund's rule exchange J(H), and leads to the C-type antiferromagnetic phase in LaVO3. The Jahn-Teller effect can stabilize the orbital ordering and the G-type antiferromagnetic phase at low temperatures, but large entropy due to orbital fluctuations favors again the C phase at higher temperatures, as observed in YVO3.

引用

页码：3879 / 3882

页数：4

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