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arXiv · 1506.07336

Magnetic field-induced insulator-semimetal transition in a pyrochlore Nd2Ir2O7

K. Ueda·J. Fujioka·B. -J. Yang·J. Shiogai·A. Tsukazaki·S. Nakamura·S. Awaji·N. Nagaosa·Y. Tokura
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Abstract

We have investigated magneto-transport properties in a single crystal of pyrochore-type Nd2Ir2O7. The metallic conduction is observed on the antiferromagnetic domain walls of the all-in all-out type Ir-5d moment ordered insulating bulk state, that can be finely controlled by 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 Nd-4f and Ir-5d 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-5d moment orders which can be finely tuned by choice of rare-earth ion and by magnetic field, respectively.

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K. Ueda, J. Fujioka, B. -J. Yang, J. Shiogai, A. Tsukazaki, S. Nakamura, S. Awaji, N. Nagaosa, Y. Tokura. 2015-06-24. Magnetic field-induced insulator-semimetal transition in a pyrochlore Nd2Ir2O7. https://doi.org/10.1103/physrevlett.115.056402

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