Anomalous temperature dependence of the ESR linewidth in CuGeO3 doped with magnetic impurities and the universal relations in the Oshikawa-Affleck theory

S. V. Demishev, Y. Inagaki, H. Ohta, S. Okubo, Y. Oshima, A. A. Pronin, N. A. Samarin, A. V. Semeno, N. E. Sluchanko

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19 Citations (Scopus)

Abstract

Studying the ESR line in CuGeO3 doped with Ti, Fe, and Co impurities we find that magnetic impurities cause the anomalous low-temperature increase of the linewidth w(T) ∼ (Bres/T)2 (where Bres denotes the resonant field) accompanied by the temperature-dependent g-factor shift Δg(T). For T < 20 K, these parameters are strongly correlated and the ratio w(T)/Δg(T) follows the general relation w(T)/Δg(T) ∼ kBT/μB. The observed effects agree with the predictions of the theory of ESR developed by Oshikawa and Affleck for 1D S = 1/2 antiferromagnetic chains.

Original languageEnglish
Pages (from-to)446-452
Number of pages7
JournalEPL
Volume63
Issue number3
DOIs
Publication statusPublished - Aug 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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