Frustration-Induced Insulating Chiral Spin State in Itinerant Triangular-Lattice Magnets

被引：62

作者：

Kumar, Sanjeev ^{[1
]}

van den Brink, Jeroen ^{[1
]}

机构：

[1] IFW Dresden, Inst Theoret Solid State Phys, D-01171 Dresden, Germany

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 105卷 / 21期

关键词：

DOUBLE EXCHANGE; MAGNETORESISTANCE; FERROMAGNET; TRANSITION; TL2MN2O7; DISORDER;

D O I：

10.1103/PhysRevLett.105.216405

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 degrees 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.

引用

页数：4

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