The magnetic properties of four different phases of the YBa 2 Cu 3 O x system, including the famous 90 K superconductor, have been probed by the positive muon spin relaxation method (µ + SR). The oxygen-deficient tetragonal insulating phase ( x ∼6.2) was found to be magnetically ordered, thus most likely antiferromagnetic, near room temperature.
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Nishida et al. (1987) studied this question.
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