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

doi:10.1143/JPSJ.81.034709

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

Research output: Contribution to journal › Article › peer-review

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 language	English
Article number	034709
Journal	journal of the physical society of japan
Volume	81
Issue number	3
DOIs	https://doi.org/10.1143/JPSJ.81.034709
Publication status	Published - 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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Emergence of magnetic long-range order in frustrated pyrochlore Nd ₂Ir ₂O ₇ with metal-insulator transition. / Tomiyasu, Keisuke; Matsuhira, Kazuyuki; Iwasa, Kazuaki; Watahiki, Masanori; Takagi, Seishi; Wakeshima, Makoto; Hinatsu, Yukio; Yokoyama, Makoto; Ohoyama, Kenji; Yamada, Kazuyoshi.

In: journal of the physical society of japan, Vol. 81, No. 3, 034709, 03.2012.

Research output: Contribution to journal › Article › peer-review

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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.",

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AU - Watahiki, Masanori

AU - Takagi, Seishi

AU - Wakeshima, Makoto

AU - Hinatsu, Yukio

AU - Yokoyama, Makoto

AU - Ohoyama, Kenji

AU - Yamada, Kazuyoshi

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