Mode-coupling calculations of electron-spin resonance in long-range spin-glasses

Abstract

A full discussion of mode-coupling theories as applied to electron-spin resonance in long-range spin-glasses is presented. High-temperature linewidth and line-shift calculations, using the method of Kubo and Tomita, are presented and compared to results previously reported [P. M. Levy, C. Morgan-Pond, and R. Raghavan, Phys. Rev. Lett. 50, 1160 (1983)], which used the Mori-Kawasaki formalism for all $T>{T}_{g}$. Justification for the decoupling procedure used and further work necessary for improved agreement close to the glass temperature ${T}_{g}$ and in high resonance fields are discussed.