ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
We have extended nonlinear mode coupling calculations of electron spin resonance (ESR) line shape parameters, previously applied to a metallic spin glass, to the insulating spin glass Eu0.4Sr0.6S for temperatures above the freezing transition. The spectrum due to short-range exchange interactions is broadened by magnetic dipole coupling. The decoupling approximations are similar to those of Levy, Morgan-Pond, and Raghavan [Phys. Rev. B 30, 2358 (1984)]. In contrast to the metallic glass we obtain agreement, without adjustable parameters, for the high-temperature limit of the linewidth seen for a 40% concentration of europium. For finite temperatures, with the density of states of the exchange interaction obtained numerically, the temperature dependent linewidth and line shift so obtained agree semiquantitatively with experiment.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.335104
