| NUKLEONIKA 1997, 42(2):515-521
EPR OF Mn2+ STUDY OF PHASE TRANSITIONS IN K2ZnCl4R. Hrabanski1, A. Kassiba2 1 Institute of Physics, Technical University of Czestochowa, al. Armii Krajowej 19, 42-200 Czestochowa, Poland 2 Equippe de Physique de l'Etat Condence (U.R.A. 807), Universite du Maine, O. Messiaen ave., 72017 Le Mans Cedex, France Temperature dependence of EPR spectra of Mn2+ ions measured in commensurate(C), incommensurate(I) and paraelectric (PE) phases of K2ZnCl4 between 300 and 560 K. The analysis of EPR spectra relies of the well-established spin Hamiltonian of Mn2+ ions in a crystalline fields or rhombic symmetry. The shifts and splittings of the EPR lines in the I phase are calculated on the basis of phenomenological model of the incommensurate modulation. EPR signal in PE phase in very weak and broadened. In the low-temperature range of the I phase the modulation wave exhibits solitonlike behaviour. Close X |