Phonon Dynamics and Multipolar Isomorphic Transition in \beta-Pyrochlore KOs2O6
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概要
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We investigate with a microscopic model anharmonic K-cation oscillation observed by neutron experiments in \beta-pyrochlore superconductor KOs2O6, which also shows a mysterious first-order structural transition at T_{\text{p}} = 7.5 K. We have identified a set of microscopic model parameters that successfully reproduce the observed tem perature dependence and the superconducting transition temperature. Considering changes in the parameters at T_{\text{p}}, we can explain puzzling experimental results about electron--phonon coupling and neutron data. Our analysis demonstrates that the first-order transition is multipolar transition driven by the octupolar component of K-cation oscillations. The octupole moment does not change the symmetry and is characteristic to noncentrosymmetric K-cation potential.
- 2011-02-15
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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