Biquadratic interactions and spin-Peierls transition in the spin-1 chain LiVGe2O6

被引：78

作者：

Millet, P

Mila, F

Zhang, FC

Mambrini, M

Van Oosten, AB

Pashchenko, VA

Sulpice, A

Stepanov, A

机构：

[1] Ctr Elaborat Mat & Etud Struct, F-31055 Toulouse, France

[2] Univ Toulouse 3, Phys Quant Lab, F-31062 Toulouse, France

[3] Univ Cincinnati, Dept Phys, Cincinnati, OH 45221 USA

[4] Max Planck Inst Festkorperforsch, High Field Magnet Lab, CNRS, F-38042 Grenoble 9, France

[5] Ctr Rech Tres Basses Temp, F-38042 Grenoble 9, France

[6] Univ Aix Marseille 3, Fac Sci St Jerome, Lab Mat Org & Proprietes, F-13397 Marseille 20, France

来源：

PHYSICAL REVIEW LETTERS | 1999年 / 83卷 / 20期

关键词：

D O I：

10.1103/PhysRevLett.83.4176

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The magnetic susceptibility of a new one-dimensional S = 1 system, the vanadium oxide LiVGe2O6, has been measured. Contrary to previous S = 1 chains, it exhibits an abrupt drop at 22 K typical of a spin-Peierls transition, and it is consistent with a gapless spectrum above this temperature. We propose that this behavior is due to the presence of a significant biquadratic exchange interaction, a suggestion supported by quantum chemistry calculations that take into account the quasidegeneracy of the t(2g) levels.

引用

页码：4176 / 4179

页数：4

共 19 条

[1] RIGOROUS RESULTS ON VALENCE-BOND GROUND-STATES IN ANTIFERROMAGNETS [J].