Antiferromagnetic Order of the Ru and Gd in Superconducting RuSr2GdCu2O8
Abstract
Neutron diffraction has been used to study the magnetic order in RuSr2GdCu2O8. The Ru moments order antiferromagnetically at TN=136(2)K, coincident with the previously reported onset of ferromagnetism. Neighboring spins are antiparallel in all three directions, with a low T moment of 1.18(6) mu B along the c-axis. Our measurements put an upper limit of ~0.1 muB to any net zero-field moment, with fields exceeding ~0.4T needed to induce a measurable magnetization. The Gd ions order independently at TN=2.50(2)K with the same spin configuration. PACS numbers: 74.72.Jt, 75.25.+z, 74.25.Ha, 75.30.Kz
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