Effect of heavy ion irradiation on the magnetic properties of CuGeO3

The influence of heavy ion irradiation on the magnetic properties of the sp in-Peierls compound CuGeO3 has been investigated by means of the electron p aramagnetic resonance, the spontaneous magnetization, and the low field ac susceptibility. The measurements were performed on the CuGeO3 single crysta ls before and after irradiation with 80 MeV oxygen ions in the wide tempera ture range of 2-300 K. It was found that the irradiation induced an increas e in the EPR signal intensity, magnetization, and susceptibility of this ma terial. It was also shown that the irradiation does not lead to a decrease in the spin-Peierls transition temperature and to the formation of an antif erromagnetic phase which is expected to appear in disordered spin-Peierls s ystems.