Phase competition in the double-exchange model on the frustrated pyrochlore lattice

Details Phase competition in the double-exchange model on the frustrated pyrochlore lattice Phase competition in the double-exchange model on the frustrated pyrochlore lattice

2010-02-18

arxiv.org/abs/1002.3643v1

Phys. Rev. Lett. 104, 106407 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 5 figures, accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.104.106407

Competition between the ferromagnetic double-exchange interaction and the super-exchange antiferromagnetic interaction is theoretically studied in the presence of geometrical frustration. As increasing the super-exchange interaction, the ferromagnetic metal becomes unstable, and is taken over by a cooperative paramagnetic metal, in sharp contrast with a discontinuous transition to the antiferromagnetic insulator in the absence of frustration. In the critical region, the system exhibits a peculiar temperature-independent behavior with highly incoherent transport, suggesting a large residual entropy at low temperatures. We discuss the relevance of the results to the pressure-induced behaviors in Mo pyrochlore oxides [S. Iguchi et al., Phys. Rev. Lett. 102, 136407 (2009)].

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