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VOLUME 47 (1988) | ISSUE 12 | PAGE 631
Distinctive features of the electron d states and structural transition in La2CuO4 high-temperature superconductors
A microscopic model for structural phase transitions in high-temperature superconductors of the La2Cu04 type is proposed. This model links these transitions with a mixing of copper d levels which are split in the crystal field (a pseudo-Jahn-Teller effect). Certain consequences of this model for superconductivity are discussed.