Effect of Neutron Irradiation on the EPR Spectra of CuGeO3
E. Mosiniewicz-Szablewskaa, L. Gładczuka, H.A. Dąbkowskab, B. Pytelc and H. Szymczaka
a Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland
b Brockhouse Institute for Materials Research, McMaster University, Hamilton, Canada
c Institute of Atomic Energy, Otwock-Świerk, Poland
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The influence of neutron irradiation on the electron paramagnetic resonance spectra of the spin-Peierls compound CuGeO3 was investigated in the wide temperature range 2-300 K. It was found that the irradiation induced appreciable changes in the EPR signal intensity, resonance line width and g-factor of this material. It was also shown that the irradiation leads to a decrease in the spin-Peierls transition temperature. For higher irradiation doses, an antiferromagnetically ordered phase can be observed at lower temperatures. This phase coexists with the spin-Peierls phase. The observed decrease in the spin-Peierls transition temperature after irradiation may be associated with some changes in topological and chemical short-range order or with the transmutation of the fraction of 63Cu in the 63Cu(n,α)60Co reaction.
DOI: 10.12693/APhysPolA.97.897
PACS numbers: 75.30.Kz, 75.50.Ee, 76.30.Da