Abstract
The electron spin resonance of 500 and 5000 ppm Gd in LaP has been observed from 2°K to 300°K. Since there is evidence that the rare earth pnictides are metallic, particular emphasis has been placed on the observation of properties due to the interaction of Gd with conduction electrons. Both samples are free of the Gd–Gd interactions seen at higher concentrations. The g value is 1.993 ± .001 at all temperatures, which is similar to values observed in cubic insulators. Using a saturation method, the spin lattice relaxation time T1 was measured over the temperature range 2–64°K. T1 is 36 μsec at 2°K and varies inversely as temperature. This rapid relaxation and dependence of T1 on temperature suggest that conduction electron effects are dominating the relaxation. The magnitude of this relaxation can be related to the conduction electron density of states and the s‐f exchange in this material.
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