Nuclear Magnetic Resonances and Long-Range Superexchange Interactions via Cu-O-V-O-Cu Linkages in LiCuVO_4

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概要

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• Nuclear magnetic resonances (NMR) of Li^7 and V^<51> have been observed in polycrystalline LiCuVO_4 in the paramagnetic state in the temperature range between 77K and 413K. The resonance shifts were found to indicate that the presence of unpaired spin densities of 0.092±0.002% and 0.004±0.002% per Cu-O-V and Cu-O-Li bonds, respectively. Comparison of the calculated spin densities using an appropriate molecular orbital with the observed ones suggests about 0.1% mixing of vanadium 4_s orbital with oxygen 2_s and p_σ ones. With these results, it can be concluded that strong antiferromagnetic superexchange interactions (J_2) along Cu-O-V-O-Cu paths is responsible to the two-dimensional antiferromagnetism, which is stabilized by a weakly coupled conventional ferromagnetic interactions (J_1) along Cu-O-Cu paths. The ratio J_1/J_2 was estimated to be 0.04 by means of Green function technique.

• 社団法人日本物理学会の論文
• 1972-09-05

著者

• SAJI Haruo

  Matsushita Research Institute Tokyo, Inc.

• Saji Haruo

  Matsushita Research Institute Tokyo Inc.

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• Nuclear Magnetic Resonances and Long-Range Superexchange Interactions via Cu-O-V-O-Cu Linkages in LiCuVO_4

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