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Magnetic Field-Induced Insulator-Semimetal Transition in a Pyrochlore Nd2Ir2O7
K Ueda1, J Fujioka1, B-J Yang2
1Department of Applied Physics and Quantum Phase Electronics Center, University of Tokyo, Tokyo 113-8656, Japan.
Physical Review Letters
|August 15, 2015
Summary
Magnetotransport in neodymium iridate reveals metallic conduction on domain walls and field-induced insulator-to-semimetal transitions. These findings suggest exotic topological states tunable by magnetic fields and rare-earth ions.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Materials
Background:
- Pyrochore-type oxides like Nd2Ir2O7 exhibit complex magnetic ordering.
- Understanding their electronic properties is crucial for novel quantum phenomena.
Purpose of the Study:
- To investigate the magnetotransport properties of single-crystal Nd2Ir2O7.
- To explore the influence of external magnetic fields on its electronic and magnetic states.
Main Methods:
- Single-crystal growth and characterization.
- Magnetotransport measurements under various magnetic field orientations ([111] and [001]).
- Theoretical calculations to model observed phenomena.
Main Results:
- Metallic conduction observed on antiferromagnetic domain walls in an all-in-all-out Ir 5d moment ordered insulating state.
- External magnetic field along [111] controls domain wall conduction.
- Field along [001] induces a bulk phase transition from insulator to semimetal via modified Nd 4f and Ir 5d moment configurations.
Conclusions:
- The study reveals tunable topological states in Nd2Ir2O7.
- Exotic states are dependent on electron correlation and magnetic ordering.
- Rare-earth ion choice and magnetic field offer pathways to tune these topological states.
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