The structural phase transition from orthorhombic to tetragonal structure in the high-T c superconductor YBa2Cu3O x has been studied by in-situ Raman scattering measurement at high temperatures. It is shown that the band in the 600 cm-1 region is enhanced in its intensity near the structural phase transition. Frequencies of several modes are measured as functions of temperature.
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Nishitani et al. (1988) studied this question.
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