High frequency ESR investigation on dynamical charge disproportionation and spin gap excitation in NaV_2O_5

Details High frequency ESR investigation on dynamical charge disproportionation and spin gap excitation in NaV_2O_5 High frequency ESR investigation on dynamical charge disproportionation and spin gap excitation in NaV_2O_5

2000-01-31

arxiv.org/abs/cond-mat/0001446v1

J. Phys. Soc. Jpn., 69 (2000) 2291

Physics

Condensed Matter

Strongly Correlated Electrons

9 figures submitted to J. Phys.Soc. Jpn

Scientific paper

10.1143/JPSJ.69.2291

A significant frequency dependence of the ESR line width is found in NaV_2O_5 between 34-100 K and the line width increases as the resonance frequency is increased from 95 GHz to 760 GHz. The observed frequency dependence is qualitatively explained in terms of the dynamical charge disproportionation. The present results show the essential role of the internal charge degree of freedom in a V-O-V bond. We have also proposed the existence of the Dzyaloshinsky-Moriya interaction in the low temperature charge ordered phase considering the breaking of the selection rule of ESR realized as the direct observation of the spin gap excitation.

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