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Importance of structural instability to high-temperature superconductivity


The orthorhombic-tetragonal structural phase transition of La2-xSrxCuO4 is quantitatively analyzed as a function of composition x within an anharmonic electron-phonon interaction model. The correct temperature dependence of the soft mode and the elastic constant c66 is obtained. The double-well potential in the electron-phonon interaction is derived self-consistently and found to vary strongly with x. In the vicinity of the superconducting transition temperature Tc electrontwo-phonon interactions dominate the harmonic ones which may explain the high Tcs observed. © 1991 The American Physical Society.

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