Spin-orbital fluctuations and a large mass enhancement in LiV2O4 -: art. no. 195107

被引：55

作者：

Yamashita, Y ^{[1
]}

Ueda, K

机构：

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

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

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

来源：

PHYSICAL REVIEW B | 2003年 / 67卷 / 19期

关键词：

D O I：

10.1103/PhysRevB.67.195107

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present a scenario that the multicomponent fluctuations, especially those of the spin-orbital coupled modes, lead to the mass enhancement observed in LiV2O4. This phenomenon is possible because all these modes are fluctuating due to the geometrical frustration. To illustrate this mechanism, the t(2g)-orbital Hubbard model on the pyrochlore lattice is studied based on the random-phase approximation. We derive the generalized susceptibility in the SU(6) spin-orbital space and calculate the free energy by using a coupling-constant integration. The estimated specific heat coefficient is of the correct order of magnitude to explain the experiment.

引用

页数：5

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