Noncollinear magnetism and spin-orbit coupling in 5d pyrochlore oxide Cd2Os2O7

Abstract

We investigated the electronic and magnetic properties of the pyrochlore oxide Cd${}_2$Os${}_2$O${}_7$ 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 non-collinear magnetic order is stable in a wide range of $U$. We also show that the easy-axis anisotropy arising from the spin-orbit (SO) coupling plays a significant role in stabilizing the all-in/all-out magnetic order. A \textit{pseudo gap} 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.

5 pages, 4 figures, accepted for publication in Physical Review Letters

References in corpus (4)

• Novel Jeff = 1/2 Mott State Induced by Relativistic Spin-Orbit Coupling in Sr2IrO4
• Emergence of magnetic long-range order in frustrated pyrochlore Nd${}_2$Ir${}_2$O${}_7$ with metal-insulator transition
• Tetrahedral Magnetic Order and the Metal-Insulator Transition in the Pyrochlore Lattice of Cd2Os2O7
• Anomalous magnetic phase in an undistorted pyrochlore oxide Cd2Os2O7 induced by geometrical frustration

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