Emergence of magnetic long-range order in frustrated pyrochlore Nd 2Ir 2O 7 with metal-insulator transition

Keisuke Tomiyasu, Kazuyuki Matsuhira, Kazuaki Iwasa, Masanori Watahiki, Seishi Takagi, Makoto Wakeshima, Yukio Hinatsu, Makoto Yokoyama, Kenji Ohoyama, Kazuyoshi Yamada

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113 Citations (Scopus)

Abstract

In this study, we performed powder neutron diffraction and inelastic scattering measurements of frustrated pyrochlore Nd 2Ir 2O 7, which exhibits a metal-insulator transition at a temperature T MI of 33 K. The diffraction measurements revealed that the pyrochlore has an antiferromagnetic long-range structure with propagation vector q 0 of (0, 0, 0) and that it grows with decreasing temperature below 15 K. This structure was analyzed to be of the all-in allout type, consisting of highly anisotropic Nd 3+ magnetic moments of magnitude 2.3 ± 0.4μ B, where μ B is the Bohr magneton. The inelastic scattering measurements revealed that the Kramers ground doublet of Nd 3+ splits below T MI. This suggests the appearance of a static internal magnetic field at the Nd sites, which probably originates from a magnetic order consisting of Ir 4+ magnetic moments. Here, we discuss a magnetic structure model for the Ir order and the relation of the order to the metal-insulator transition in terms of frustration.

Original languageEnglish
Article number034709
Journaljournal of the physical society of japan
Volume81
Issue number3
DOIs
Publication statusPublished - 2012 Mar

Keywords

  • All-in all-out structure
  • Localization and itinerancy
  • Spin ice
  • Spin-orbit interaction

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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