ESR Study of the Incommensurate-Commensurate Phase Transition in {N(CH₃)₄}₂CoCl₄

Abstract

ESR spectra of Mn 2+ doped in the {N(CH 3 ) 4 } 2 CoCl 4 crystal were observed in the normal, incornmensurate and commensurate phases. The D tensor in the normal phase was determined from the angular dependence of the spectrum. It was concluded from the symmetry of the D tensor that Mn 2+ ions were replaced at Co sites. Splitting and broadening of the lines were observed even in the incommensurate phase. The lines which corresponded to the commensurate structure were observed near the incommensurate-commensurate transition temperature in the incommensurate phase.