Magnetic Field-Induced Insulator-Semimetal Transition in a Pyrochlore Nd2Ir2 O7

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

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59 Citations (Scopus)

Abstract

We investigate magnetotransport 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 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 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 the choice of rare-earth ion and magnetic field, respectively.

Original languageEnglish
Article number056402
JournalPhysical review letters
Volume115
Issue number5
DOIs
Publication statusPublished - 2015 Jul 30

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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