Orbitally Driven Spin-Singlet Dimerization in S=1 La4Ru2O10

Physical Review Letters 96 巻 25 号 2006 発行
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タイトル ( eng )
Orbitally Driven Spin-Singlet Dimerization in S=1 La4Ru2O10
作成者
Wu H.
Hu Z.
Burnus T.
Denlinger J.D.
Khalifah P.G.
Mandrus D.G.
Jang L.-Y.
Hsieh H.H.
Liang K.S.
Allen J.W.
Cava R.J.
Khomskii D.I.
Tjeng L.H.
収録物名
Physical Review Letters
96
25
抄録
Using x-ray absorption spectroscopy at the Ru-L2,3 edge we reveal that the Ru4+ ions remain in the S=1 spin state across the rare 4d-orbital ordering transition and spin-gap formation. We find using local spin density approximation+Hubbard U band structure calculations that the crystal fields in the low-temperature phase are not strong enough to stabilize the S=0 state. Instead, we identify a distinct orbital ordering with a significant anisotropy of the antiferromagnetic exchange couplings. We conclude that La4Ru2O10 appears to be a novel material in which the orbital physics drives the formation of spin-singlet dimers in a quasi-two-dimensional S=1 system.
言語
英語
資源タイプ 学術雑誌論文
出版者
American Physical Society
発行日 2006
権利情報
Copyright (c) 2006 American Physical Society.
出版タイプ Version of Record(出版社版。早期公開を含む)
アクセス権 オープンアクセス
収録物識別子
[ISSN] 0031-9007
[DOI] 10.1103/PhysRevLett.96.256402
[NCID] AA00773679
[DOI] http://dx.doi.org/10.1103/PhysRevLett.96.256402