title: Noncollinear magnetism and spin-orbit coupling in 5d pyrochlore oxide Cd2Os2O7.
abstract: We investigate the electronic and magnetic properties of the pyrochlore oxide Cd2Os2O7 using the density-functional theory plus on-site repulsion (U) method, and depict the ground-state phase diagram with respect to U. We conclude that the all-in-all-out noncollinear magnetic order is stable in a wide range of U. We also show that the easy-axis anisotropy arising from the spin-orbit coupling plays a significant role in stabilizing the all-in-all-out magnetic order. A pseudogap was observed near the transition between the antiferromagnetic metallic and insulating phases. Finally, we discuss possible origins of the peculiar low-temperature (T) properties observed in experiments.
authors.affiliation: National Institute of Advanced Industrial Science and Technology (AIST), Umezono, Tsukuba 305-8568, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Shinaoka
authors.forename: Takashi
authors.initials: T
authors.lastname: Miyake
authors.forename: Shoji
authors.initials: S
authors.lastname: Ishibashi