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- W2078942317 abstract "The vibronic theory of a structural phase transition in IV-VI compounds is reformulated in terms of the mean-field approximation, taking account of the spin-orbit coupling between conduction and valence bands and anharmonic couplings between TA and TO modes. The effect of the electron-hole pair polarization is incorporated into the self-energies of the TA phonon as well as the TO phonon, so as to give the carrier concentration dependence of shear modulus ${C}_{44}$. This yields the proper dependence of the ratio ensuremath{zeta} of temperature derivatives of the squared TO-phonon frequencies in the cubic and rhombohedral phases on the carrier concentration, and also that of the jump of ${C}_{44}$ in the acoustic anomaly at the transition point. It is shown that the ratio ensuremath{zeta} becomes divergent at the tricritical point, and the TA mode softens at the superheating point (in case of first-order transition) or at the tricritical point. The spin-orbit coupling leads to peculiar structures of Fermi surfaces and to an increase in the electron chemical potential with growth of sublattice displacement. It is also shown in the fourth-order anharmonicity of the TO mode that the lattice anharmonicity is suppressed by the vibronic anharmonicity due to the spin-orbit coupling." @default.
- W2078942317 created "2016-06-24" @default.
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- W2078942317 date "1986-12-01" @default.
- W2078942317 modified "2023-09-26" @default.
- W2078942317 title "Vibronic theory of a structural phase transition and a tricritical point in IV-VI compounds" @default.
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- W2078942317 doi "https://doi.org/10.1103/physrevb.34.8019" @default.
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