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Hidden multiple-spin interactions as an origin of spin scalar chiral order in frustrated Kondo lattice models
Yutaka Akagi1, Masafumi Udagawa, Yukitoshi Motome
1Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan. akagi@aion.t.u-tokyo.ac.jp
Abstract:
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.
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