Neutron diffraction has been used to study the magnetic order in RuSr 2 GdCu 2 O 8 . The Ru moments order antiferromagnetically at T N ϭ136(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) B along the c axis. Our measurements put an upper limit of ϳ0.1 B to any net zero-field moment, with fields exceeding 0.4T needed to induce a measurable magnetization. The Gd ions order independently at T N ϭ2.50(2) K with the same spin configuration. RAPID COMMUNICATIONS R14 966 PRB 61 LYNN, KEIMER, ULRICH, BERNHARD, AND TALLON RAPID COMMUNICATIONS PRB 61 R14 967 ANTIFERROMAGNETIC ORDERING OF Ru AND Gd IN . . .
A detailed inelastic neutron scattering study of the high temperature superconductor YBa2Cu3O6.85 provides evidence of new resonant magnetic features, in addition to the well-known resonant mode at 41 meV: (i) a commensurate magnetic resonance peak at 53 meV with an even symmetry under exchange of two adjacent CuO2 layers, and (ii) high-energy incommensurate resonant spin excitations whose spectral weight is around 54 meV. The locus and the spectral weight of these modes provides unrevealed insight about the momentum shape of the electron-hole spin-flip continuum of d-wave superconductors.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.