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Magnetic properties of a newly discovered high-T c superconductor, Y-Ba-Cu oxide, were studied by zero-field positive muon spin relaxation method in a zero external magnetic field. Some kind of a magnetic phase transition was found at a temperature between 10 K and 27 K. It is discussed how this magnetism relates to the superconductivity.
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Nishida et al. (1987) studied this question.
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