Slow Spin Dynamics in Non-Fermi-Liquid UCu_{5-x}Pd_x, x = 1.0 and 1.5
arXiv:cond-mat/0109070 · doi:10.1016/S0921-4526(01)01169-3
Abstract
Low-temperature muon spin-lattice relaxation measurements in the non-Fermi-liquid heavy-fermion alloys UCu_{5-x}Pd_x, x = 1.0 and 1.5, indicate inhomogeneously distributed f-electron spin fluctuation rates, and exhibit a time-field scaling of the muon relaxation function indicative of long-lived spin correlations. In UCu_4Pd the scaling exponent γis small and temperature independent. In UCu_{3.5}Pd_{1.5} γvaries with temperature, increasing with decreasing temperature similar to spin-glass AgMn. This suggests that the spin-glass state found for x \gtrsim 2 in UCu_{5-x}Pd_x modifies the low-frequency spin dynamics in UCu_{3.5}Pd_{1.5}.
5 pages, 2 figures. To be published in Proc. Int. Conf. SCES2001 (Physica B)