Contribution to the theory of spin resonance of dilute magnetic alloys

Abstract

From a microscopic point of view the fundamental theory about this problem is given in (1). In that theory, however, the detailed balance relation, postulated in phenomenological work (2, 3), is violated (4). The way, proposed in (4), to overcome this discrepancy i s not satisfactory.In the followir;g, the dynamic transverse susceptibility i s calculated from a microscopic starting point. The results satisfy the law of detailed balance. For the bottleneck (3) relaxation rate a temperature independent term being of first order in the exchange parameter, results from this law.

The Influence of Crystal Field on Breadths and Splitting of ESR Lines of Dilute Magnetic Alloys

“…Expressing this breakdown mathematically we have applied the projector formalism in Liouville space (5). Here we have used the projector onto the subspace spanned by As and the transition operators of the crystal field energy levels of the local moments.…”

“…Here we have used the projector onto the subspace spanned by As and the transition operators of the crystal field energy levels of the local moments. As in (5) we have neglected the frequency dependence of the %elf energyTT. All relevant terms of the dynamic transverse susceptibility x ( w ) have been calculated in lowest nonvanishing order of the exchange parameter J.…”