Description: We have found that the erbium magnetic moment is so large that in ErRh/sub 4/B/sub 4/ it can relax muon polarization in times shorter than can be resolved by a typical ..mu..SR apparatus. The complete relaxation signal is resolved at temperatures above 50K only because of rapid fluctuation of the erbium moment, which partially decouples it from the muon's moment. Not much signal is resolved at temperatures less than or equal to 10K, but no dramatic effect is seen in crossing the superconducting transition temperature. The higher temperature local field fluctuation rates observed appear consistent with the exchange and spin-lattice fluctuation rates to be expected of erbium in this material. Perhaps more information on moment dynamics below 10K can be obtained by alloying erbium with a nonmagnetic rare earth such as yttrium within the RERh/sub 4/B/sub 4/ structure (as has been attempted for holmium), to reduce the rms local field at the muon.
Date: January 1, 1984
Creator: Noakes, D.R.; Ansaldo, E.J.; Brewer, J.H.; Harshman, D.R.; Huang, C.Y.; Torikachili, M.S. et al.
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