Electron spin resonance study of anisotropic interactions in a two-dimensional spin gap magnet PHCC

摘要

Fine details of the excitation spectrum of the two-dimensional spin-gapmagnet PHCC are revealed by electron spin resonance investigations. The valuesof anisotropy parameters and the orientations of the anisotropy axes aredetermined by accurate measurements of the angular, frequency-field andtemperature dependences of the resonance absorption. The properties of aspin-gap magnet in the vicinity of critical field are discussed in terms ofsublevel splittings and g-factor anisotropy.