Frustration-Induced Insulating Chiral Spin State in Itinerant Triangular-Lattice Magnets
Abstract
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° 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 R2Mo2O7.
- Publication:
-
Physical Review Letters
- Pub Date:
- November 2010
- DOI:
- arXiv:
- arXiv:1007.2278
- Bibcode:
- 2010PhRvL.105u6405K
- Keywords:
-
- 71.27.+a;
- 71.30.+h;
- 71.10.-w;
- 75.10.-b;
- Strongly correlated electron systems;
- heavy fermions;
- Metal-insulator transitions and other electronic transitions;
- Theories and models of many-electron systems;
- General theory and models of magnetic ordering;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 4+ pages, published version