Antiferromagnetic Order of the Ru and Gd in Superconducting RuSr2GdCu2O8
J. W. Lynn, B. Keimer, C. Ulrich, C. Bernhard, J. L. Tallon
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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