Abstract

Abstract The low—temperature orthorhombic (LTO) phase of high—Tc superconducting La2-xBaxCuO4 having two formula units per primitive cell may exhibit a further structural transition into a low—temperature tetragonal (LTT) phase with four La2CuO4 units depending on the Ba—doping, 0·05 500 K, we have investigated mode—softening in the LTO phase of the possible sequence of transformations: HTT → LTO → LTT. Estimates for non—universal parameters of an appropriate Ginzburg—Landau (GL) theory for a two—component order—parameter field of these transformations, as being obtained from a comparison with experiments, a...

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