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- W1515677902 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 < × < 0·20. Small differences between the orthorhombic and tetragonal crystal structure being generated by the condensation of a low—lying transverse mode are found to have large effects on the superconducting transition temperature. Since the parent compound La2CuO4 of superconducting oxides La2-x(Sr, Ba)xCuO4 moreover has a high—temperature tetragonal (HTT) phase above some elevated temperature Ts > 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, are briefly discussed." @default.
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- W1515677902 date "1992-04-01" @default.
- W1515677902 modified "2023-10-17" @default.
- W1515677902 title "Mode—softening in orthorhombic La<sub>2</sub>CuO<sub>4</sub>" @default.
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- W1515677902 doi "https://doi.org/10.1080/00150199208015076" @default.
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