A Possible Isomorphic Transition in β-Pyrochlore Compounds(Condensed matter: structure and mechanical and thermal properties)
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概要
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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 β-pyrochlore AOs_2O_6 (A=K, Rb or Cs). We find the line of the first order phase transition from large to small oscillation amplitude phases as temperature decreases. Our theory can explain the origin of the mysterious first order transition in KOs_2O_6. We also discuss the possibility of a phase with local electric polarizations.
- 社団法人日本物理学会の論文
- 2009-01-15
著者
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Tsunetsugu Hirokazu
Institute For Solid Physics The University Of Tokyo
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HATTORI Kazumasa
Institute for Solid State Physics, University of Tokyo
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Hattori Kazumasa
Institute For Solid State Physics University Of Tokyo
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TSUNETSUGU Hirokazu
Institute for Solid State Physics, University of Tokyo
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