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, and Y. Tokura
Phys. Rev. Lett. 115, 056402 – Published 30 July 2015
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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.

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  • Received 26 February 2015

DOI:https://doi.org/10.1103/PhysRevLett.115.056402

© 2015 American Physical Society

Authors & Affiliations

K. Ueda1, J. Fujioka1, B.-J. Yang2, J. Shiogai3, A. Tsukazaki3, S. Nakamura3, S. Awaji3, N. Nagaosa1,2, and Y. Tokura1,2

  • 1Department of Applied Physics and Quantum Phase Electronics Center, University of Tokyo, Tokyo 113-8656, Japan
  • 2Center for Emergent Matter Science (CEMS), RIKEN Advanced Science Institute (ASI), Wako 351-0198, Japan
  • 3Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

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Issue

Vol. 115, Iss. 5 — 31 July 2015

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