Abstract
We investigate magnetotransport properties in a single crystal of pyrochore-type . The metallic conduction is observed on the antiferromagnetic domain walls of the all-in–all-out-type Ir moment ordered insulating bulk state that can be finely controlled by an external magnetic field along [111]. On the other hand, an applied field along [001] induces the bulk phase transition from insulator to semimetal as a consequence of the field-induced modification of the Nd and Ir moment configurations. A theoretical calculation consistently describing the experimentally observed features suggests a variety of exotic topological states as functions of electron correlation and Ir moment orders, which can be finely tuned by the choice of rare-earth ion and magnetic field, respectively.
- Received 26 February 2015
DOI:https://doi.org/10.1103/PhysRevLett.115.056402
© 2015 American Physical Society