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

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

doi:10.1143/JPSJ.69.2291

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

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

Institute for Materials Research (IMR) (institute affiliation only)

Research output: Contribution to journal › Article › peer-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 language	English
Pages (from-to)	2291-2298
Number of pages	8
Journal	journal of the physical society of japan
Volume	69
Issue number	7
DOIs	https://doi.org/10.1143/JPSJ.69.2291
Publication status	Published - 2000 Jul

Keywords

Charge disproportionation
ESR
NaVO
Spin gap

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1143/JPSJ.69.2291

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title = "High Frequency ESR Investigation on Dynamical Charge Disproportionation and Spin Gap Excitation in NaV2O5",

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.",

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author = "Hiroyuki Nojiri and Sebastian Luther and Mitsuhiro Motokawa and Masahiko Isobe and Yutaka Ueda",

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T1 - High Frequency ESR Investigation on Dynamical Charge Disproportionation and Spin Gap Excitation in NaV2O5

AU - Nojiri, Hiroyuki

AU - Luther, Sebastian

AU - Motokawa, Mitsuhiro

AU - Isobe, Masahiko

AU - Ueda, Yutaka

PY - 2000/7

Y1 - 2000/7

N2 - 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.

AB - 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.

KW - Charge disproportionation

KW - ESR

KW - NaVO

KW - Spin gap

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