High Frequency ESR Investigation on Dynamical Charge Disproportionation and Spin Gap Excitation in NaV2O5

Hiroyuki Nojiri, Sebastian Luther, Mitsuhiro Motokawa, Masahiko Isobe, Yutaka Ueda

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

A significant frequency dependence of the ESR line width is found in NaV2O5 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.

Original languageEnglish
Pages (from-to)2291-2298
Number of pages8
Journaljournal of the physical society of japan
Volume69
Issue number7
DOIs
Publication statusPublished - 2000 Jul

Keywords

  • Charge disproportionation
  • ESR
  • NaVO
  • Spin gap

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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