X-,K- and Q-band ESR studies on intercalated Fe0.9PS3(Phen)0.4

The temperature and frequency dependences of electron spin resonance parameters of polycrystalline powders of intercalated (Fe09PS3)-P-.(Phen)(0.4) have been studied in the temperature range 9-300 K. A very strong and relatively broad single ESR peak in X-,K-and Q-band spectra have been observed. However, a very sharp decrease in X-band ESR signal intensity and accompanying line broadening below 15K indicates a very strong spin frustration at lower temperatures. K- and Q-band spectra show almost a linear dependence of resonance field on frequency. From the analysis of the frequency-dependent resonance field of ESR signal, the effects of the internal field is refined and thus the spectroscopic g-factor and internal field were determined to be 1.9576 and 197G, respectively. Also very small nonlinearity in H-r versus frequency curve was attributed to the external field dependency of the internal field through magnetic susceptibility. Some small and relatively smooth changes at about 40, 80 and 160K appeared as well, indicating some kind of magnetic anomolies. (C) 2002 Elsevier Science B.V. All rights reserved.