期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 81, 期 3, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.81.034709
关键词
all-in all-out structure; spin-orbit interaction; spin ice; localization and itinerancy
资金
- Ministry of Education, Culture, Sports, Science and Technology of Japan [22014001, 19052005, 23540417, 21224008, 22244039, 20102005, 21102518]
- Institute for Materials Research at Tohoku University
- Grants-in-Aid for Scientific Research [21224008, 22740209, 22244039, 23540417, 20102005, 23102703, 22014001, 23244068, 21102518] Funding Source: KAKEN
In this study, we performed powder neutron diffraction and inelastic scattering measurements of frustrated pyrochlore Nd2Ir2O7, 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 all-out type, consisting of highly anisotropic Nd3+ magnetic moments of magnitude 2.3 +/- 0.4 mu(B), where mu(B) is the Bohr magneton. The inelastic scattering measurements revealed that the Kramers ground doublet of Nd3+ 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 Ir4+ 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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