Dimerization versus orbital-moment ordering in a Mott insulator YVO3 -: art. no. 257203

被引:85
作者
Horsch, P
Khaliullin, G
Oles, AM
机构
[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany
[2] Russian Acad Sci, EK Zavoisky Phys Tech Inst, Kazan 420029, Russia
[3] Jagiellonian Univ, M Smoluchowski Inst Phys, PL-30059 Krakow, Poland
关键词
D O I
10.1103/PhysRevLett.91.257203
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We use exact diagonalization combined with mean-field theory to investigate the phase diagram of the spin-orbital model for cubic vanadates. The spin-orbit coupling competes with Hund's exchange and triggers a novel phase, with the ordering of t(2g) orbital magnetic moments stabilized by the tilting of VO6 octahedra. It explains qualitatively spin canting and reduction of magnetization observed in YVO3. At finite temperature, an orbital instability in the C-type antiferromagnetic phase induces modulation of magnetic exchange constants even in the absence of lattice distortions. The calculated spin structure factor shows a magnon splitting at (q) over right arrow = (0,0,pi/2) due to the orbital dimerization.
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页数:4
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