2006年1月
Spin-1/2 triangular lattice with orbital degeneracy in a metallic oxide Ag2NiO2
PHYSICAL REVIEW B
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- 巻
- 73
- 号
- 2
- 開始ページ
- 020408(R)
- 終了ページ
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/PhysRevB.73.020408
- 出版者・発行元
- AMERICAN PHYSICAL SOC
A metallic and magnetic transition metal oxide Ag2NiO2 is studied by means of resistivity, magnetic susceptibility, specific heat, and x-ray diffraction. The crystal structure is characterized by an alternating stacking of a Ni3+O2 layer and a (Ag-2)(+) layer, the former realizing a spin-1/2 triangular lattice with e(g) orbital degeneracy and the latter providing itinerant electrons. It is found that the NiO2 layer exhibits orbital ordering at T-s = 260 K and antiferromagnetic spin ordering at T-N= 56 K. Moreover, a moderately large mass enhancement is found for the itinerant electrons, suggesting a significant contribution from the nearly localized Ni 3d state to the Ag 5s state that forms a broad band.
- リンク情報
- ID情報
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- DOI : 10.1103/PhysRevB.73.020408
- ISSN : 1098-0121
- Web of Science ID : WOS:000235009300011