Electron paramagnetic resonance study of gadoliniumndash;galliumndash;garnet

摘要

The electron paramagnetic resonance (EPR) in a single crystal of gadoliniumndash;galliumndash;garnet has been studied with the aim of understanding the behavior of EPR in systems with large dipolar and small exchange fields, such as encountered in many of the rarehyphen;earth based highTcsuperconducting compounds. Only one wide line, arising from Gd3+has been observed. Its shape at room temperature is analyzed using the Kubondash;Toyabe lsqb;MagneticResonanceandRelaxation, edited by R. Blinc (North Holland, Amsterdam, 1967), p. 810rsqb; stochastic model for the line shape at static modulation. At lowT, the anisotropy in the resonance field is a purely shape effect.