Abstract
Some authors have suggested the possible role of cooperative Jahn-Teller effects in the superconducting mechanism of high- T c superconducting copper oxides. The implications of Jahn-Teller effects are studied by examining the tetragonal-orthorhombic structural phase transitions in superconducting doped La 2CuO 4 within the framework of a theory of modulated cooperative Jahn-Teller phase transitions. The Jahn-Teller picture can account qualitatively for the structural phase transitions if at least 4th order anharmonicity is included. The applicability of the Jahn-Teller picture to YBaCuO is discussed. The role of anharmonicity has important implications for suggestions of non-linear soliton modes in the superconducting mechanism.
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