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A structure reminiscent of the YBa2Cu3O7 superconductor is shown by the novel reduced manganese perovskite YBaMn2O5 (on the right), in which double layers of MnO5 square pyramids enclose the Ba2+ ions (large spheres), while Y3+ ions (medium-sized black spheres) lie between the layers. Unlike many oxidized Mn perovskites, YBaMn2O5 does not exhibit magnetoresistive effects. Instead a ferrimagnetic transition occurs at 167 K which may be due to Mn2+/Mn3+ valence and spin ordering.
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Chapman et al. (1996) studied this question.
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