The coexistence of antiferromagnetism and superconductivity in the hybrid ruthenate-cuprate RuSr 2 YCu 2 O 8 synthesized under high pressure has been confirmed by means of powder neutron diffraction and resistivity measurements. The Ru moments are antiferromagnetically ordered at about 149 K and Ru spins can be aligned by applying a magnetic field, suggesting that the system gradually changes from antiferromagnetism to ferromagnetism. However, the superconductivity in the compound persists even at H =9 T. This indicates the coexistence of ferromagnetism and superconductivity under a high magnetic field.
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Takagiwa et al. (2001) studied this question.
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