Hidden Multiple-Spin Interactions as an Origin of Spin Scalar Chiral Order in Frustrated Kondo Lattice Models

被引：127

作者：

Akagi, Yutaka ^{[1
]}

Udagawa, Masafumi ^{[1
,2
]}

Motome, Yukitoshi ^{[1
]}

机构：

[1] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan

[2] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 09期

关键词：

Condensed matter physics;

D O I：

10.1103/PhysRevLett.108.096401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We reveal the significance of kinetic-driven multiple-spin interactions hidden in geometrically frustrated Kondo lattice models. Carefully examining the perturbation in terms of the spin-charge coupling up to the fourth order, we find that a positive biquadratic interaction is critically enhanced and plays a crucial role on stabilizing a spin scalar chiral order near 1/4 filling in a triangular lattice case. This is a generalized Kohn anomaly, appearing only when the second-order perturbation is inefficient because of the degeneracy under frustration. The mechanism is potentially common to frustrated spin-charge coupled systems, leading to emergence of unusual magnetic orders.

引用

页数：5

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