Frustration-induced insulating chiral spin state in itinerant triangular-lattice magnets

Details Frustration-induced insulating chiral spin state in itinerant triangular-lattice magnets Frustration-induced insulating chiral spin state in itinerant triangular-lattice magnets

2010-07-14

arxiv.org/abs/1007.2278v2

Phys. Rev. Lett. 105, 216405 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

4+ pages, published version

Scientific paper

10.1103/PhysRevLett.105.216405

We study the double-exchange model at half-filling with competing superexchange interactions on a triangular lattice, combining exact diagonalization and Monte-Carlo methods. We find that in between the expected itinerant ferromagnetic and $120^{\circ}$ Yafet-Kittel phases a robust scalar-chiral, insulating spin state emerges. At finite temperatures the ferromagnet - scalar-chiral quantum critical point is characterized by anomalous bad-metal behavior in charge transport as observed in frustrated itinerant magnets R$_2$Mo$_{2}$O$_7$.

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