Nuclear Magnetic Resonance Study on Low-Dimensional Antiferromagnetic Oxides : VOMoO_4 and (V_<0.56>Mo_<0.44>)_2O_5 : Condensed Matter: Electronic Properties, etc.
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概要
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We have carried out the nuclear magnetic resonance (NMR) of ^<51>V in VOM_OO_4, which contains linear chains of distorted VO_6 octahedra. The temperature dependence of the resonance shift K shows a small extremum around 100 K, that can reasonably be compared with the Bonner-Fisher-type behavior of the susceptibility χ. ^<51>V relaxation rate T^<-1>_1, on the other hand, has a complex temperature dependence: an exponential decrease down to 〜100 K, a near plateau between 〜100 and 〜34 K, and a monotonous decrease below 〜34 K. These are interpreted in terms of thermal-excitations between split t_<2g> orbitals in energy (ΔE〜680 K) due to the local distortion of VO_6 octahedra at high temperatures, one-dimensional d-spin fluctuations, and a short-range magnetic ordering at low temperatures, respectively. It is noted that the change in the a-axis length must be taken into consideration to adequately describe the broad maximum observed in both K and χ around 100 K. The ^<51>V NMR in the related oxide (V_<0.56>Mo_<0.44>)_2O_5 was also carried out, in which the VO_6 and MoO_6 octahedra form a planer network sharing the corner oxygen atoms.
- 社団法人日本物理学会の論文
- 2001-04-15
著者
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WADA Shinji
Department of Physics, Graduate School of Science, Kobe University
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Wada Shinji
Department Of Material Science Graduate School Of Science 〓 Technology And Department Of Physics Fac
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Takata Shohei
Department Of Material Science Graduate School Of Science 〓 Technology And Department Of Physics Fac
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Shiozaki Ikuyo
Graduate School Of Science Tokyo Metropolitan University
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Wada Shinji
Department Of Material Science Graduate School Of Science & Technology Kobe University
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