Journal
PHYSICAL REVIEW B
Volume 83, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.83.174402
Keywords
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Funding
- NSFC
- Pujiang plan
- Program for Professor of Special Appointment (Eastern Scholar)
- US DOE [DE-AC36-08GO28308, DE-FG02-86ER45259]
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The electronic and magnetic properties of spin-1/2 pyrochlores R2V2O7 were investigated on the basis of density-functional calculations. Contrary to common belief, the spin-1/2 V4+ ions are found to have a substantial easy-axis single-ion anisotropy. We show that the magnon quantum Hall effect of Lu2V2O7 is a combined consequence of the easy-axis single-ion anisotropy and the Dzyaloshinskii-Moriya interaction of the spin-1/2 V4+ ions. We also show that the negative magnetoresistance observed for R2V2O7 arises from a different mechanism, i.e., the band gap decreases as the spin alignment becomes more parallel to each other.
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