Metal-Insulator Transition and Magnetic Order in the Pyrochlore Oxide Hg2Ru2O7

被引：10
|
作者：
Yoshida, Makoto [1 ]
Takigaway, Masashi [1 ]
Yamamoto, Ayako [2 ]
Takagi, Hidenori [2 ,3 ]
机构：
[1] Univ Tokyo, Inst Solid State Phys, Chiba 2778581, Japan
[2] RIKEN Adv Sci Inst, Wako, Saitama 3510198, Japan
[3] Univ Tokyo, Dept Adv Mat, Chiba 2778561, Japan
来源：
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2011年 / 80卷 / 03期
基金：
日本学术振兴会;
关键词：
pyrochlore structure; ruthenium oxide; Hg2Ru2O7; NMR; metal-insulator transition; magnetic order; GEOMETRICALLY FRUSTRATED ANTIFERROMAGNET; QUANTUM SPIN LIQUID; LATTICE; RELAXATION; DISORDER; LIV2O4;
D O I：
10.1143/JPSJ.80.034705
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We report results of NMR experiments on the ruthenium oxide Hg2Ru2O7 with the pyrochlore structure, which exhibits a metal-insulator transition at T-MI = 107 K. In the metallic phase above TMI, the nuclear spin-lattice relaxation rate 1/T-1 and the Knight shift at the Hg sites follow the Korringa relation, indicating the absence of substantial spatial spin correlation. At low temperatures in the insulating phase, Ru-99,Ru-101-NMR signals are observed at zero magnetic field, providing evidence for a commensurate antiferromagnetic order. The estimated ordered moment is about 1 mu(B) per Ru, much smaller than 3 mu(B) expected for the ionic (4d)(3) configuration of Ru5+. Thus, the localized spin models are not appropriate for the insulating phase of Hg2Ru2O7. We also discuss possible antiferromagnetic spin structures.
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页数：9
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