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Influence of neutron and heavy-ion irradiation on EPR spectra of CuGeO3

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Abstract

The influence of neutron and heavy-ion irradiation on the electron paramagnetic resonance (EPR) spectra of the spin-Peierls compound CuGeO3 has been investigated in the wide temperature range of 2–300 K. It is found that the neutron irradiation leads to a decrease of the spin-Peierls transition temperature and induces appreciable changes in the EPR signal intensity, resonance line width andg-factor of this material. These changes may be associated with a partial suppression of both the energy gap and dimerization within the Cu chains due to the irradiation-induced changes in the topological and chemical short-range order. In contrast to this, the heavy-ion irradiation induces only an increase in the intensity of the EPR signal and does not produce appreciable changes in the resonance line width,g-factor and spin-Peierls transition temperature. The experimental results show a large increase in the Curie-Weiss component and complete suppression of the spin-Peierls transition for higher irradiation doses.

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Authors and Affiliations

  1. Institute of Physics, Polish Academy of Sciences, A1. Lotników 32/46, 02668, Warsaw, Poland

    E. Mosiniewicz-Szablewska & K. Świątek

  2. Brockhouse Institute for Materials Research, McMaster University, Hamilton, Canada

    H. Dąbkowska

Authors
  1. E. Mosiniewicz-Szablewska
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  2. K. Świątek
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  3. H. Dąbkowska
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Correspondence to E. Mosiniewicz-Szablewska.

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Mosiniewicz-Szablewska, E., Świątek, K. & Dąbkowska, H. Influence of neutron and heavy-ion irradiation on EPR spectra of CuGeO3 . Appl. Magn. Reson. 24, 361–367 (2003). https://doi.org/10.1007/BF03166937

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  • DOI: https://doi.org/10.1007/BF03166937

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