Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-11-28
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 4 figures, accepted for publication in Physical Review Letters
Scientific paper
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.
Ishibashi Shoji
Miyake Takashi
Shinaoka Hiroshi
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