A Possible Phase Transition in beta-pyrochlore Compounds

Details A Possible Phase Transition in beta-pyrochlore Compounds A Possible Phase Transition in beta-pyrochlore Compounds

2008-09-04

arxiv.org/abs/0809.0732v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, submitted to J. Phys. Soc. Jpn

Scientific paper

10.1143/JPSJ.78.013603

We investigate a lattice of interacting anharmonic oscillators by using a mean field theory and exact diagonalization. We construct an effective five-state hopping model with intersite repulsions as a model for beta-pyrochlore AOs_2O_6(A=K, Rb or Cs). We obtain the first order phase transition line from large to small oscillation amplitude phases as temperature decreases. We also discuss the possibility of a phase with local electric polarizations. Our theory can explain the origin of the mysterious first order transition in KOs_2O_6.

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