A low temperature structural phase transition in La 2-x Ba x CuO 4 was recently discovered, and has been shown to severely depress the superconducting transition temperature. It is suggested that this structural transition is associated with a charge density wave in the CuO 2 planes which was predicted to play a major role in high-T c oxide superconductivity.
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R. S. Markiewicz (1990) studied this question.
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