Physics of the Solid State

, Volume 46, Issue 12, pp 2238–2248 | Cite as

Microwave EPR spectroscopy of cobalt-doped germanium cuprate

  • S. V. Demishev
  • A. V. Semeno
  • N. E. Sluchanko
  • N. A. Samarin
  • A. A. Pronin
  • Y. Inagaki
  • S. Okubo
  • H. Ohta
  • Y. Oshima
  • L. I. Leonyuk
Magnetism and Ferroelectricity

Abstract

Resonance magnetoabsorption spectra of CuGeO3 single crystals containing 2% Co impurity have been studied in the frequency range 60–360 GHz in magnetic fields of up to 16 T and in the temperature interval 2–60 K with the magnetic field B aligned parallel to the a crystallographic axis. In addition to the Cu2+ chain resonance, a new absorption line (unobserved previously in doped CuGeO3 and deriving apparently from the Co2+ ions) was detected in EPR spectra. Quantitative analysis of the spectra suggests that the spin-Peierls transition occurs in about 10% Cu2+ chains, while the spin-Peierls state in the remaining 90% chains is completely destroyed by cobalt doping. The results obtained reveal considerable deviations from the universally accepted scenario of CuGeO3 doping and are discussed within alternative theoretical models, namely, the quantum critical behavior (based on the EPR theory for quasi-one-dimensional systems) and a three-dimensional antiferromagnet with the Néel temperature lowered by disorder.

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Copyright information

© MAIK "Nauka/Interperiodica" 2004

Authors and Affiliations

  • S. V. Demishev
    • 1
    • 4
  • A. V. Semeno
    • 1
  • N. E. Sluchanko
    • 1
  • N. A. Samarin
    • 1
  • A. A. Pronin
    • 1
  • Y. Inagaki
    • 2
  • S. Okubo
    • 2
  • H. Ohta
    • 2
  • Y. Oshima
    • 2
  • L. I. Leonyuk
    • 3
  1. 1.Prokhorov General Physics InstituteRussian Academy of SciencesMoscowRussia
  2. 2.Molecular Photoscience Research CenterKobe UniversityKobeJapan
  3. 3.Moscow State UniversityVorob’evy gory, MoscowRussia
  4. 4.Moscow Physicotechnical InstituteDolgoprudnyi, Moscow oblastRussia

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