Magnetic Resonance of a Localized Magnetic Moment in the Superconducting State: LaRu2:Gd

Abstract

The magnetic resonance of dilute La${\mathrm{Ru}}_2$:Gd has been observed in both the superconducting and normal states. A reduction in the $g$ shift and an increase in the thermal broadening were observed, upon going from the normal to the superconducting regime. The spin-orbit scattering rate, $\frac{1}{{\tau }_{\mathrm{s}.\mathrm{o}.\mathrm{}}}$, is estimated from both EPR and the re-entrant behavior of the upper critical field in La${\mathrm{Ru}}_2$:Gd.