Abstract
Our recent observation of universal scaling in ω/ T of the magnetic response of the non-Fermi liquid compound UCu 5 − x Pd x provides evidence of single-impurity quantum critical fluctuations of the uranium 5f-electrons. The scaling is observed over a wide range of frequencies from ∼1 to 25 meV, and a wide range of temperatures from ∼10 to 300 K, with evidence of a cross-over to more conventional moment fluctuations above 25 meV. We now have evidence from measurements with full polarization analysis of the development of antiferromagnetic correlations below 10 K in UCu 4Pd, but not in UCu 3.5Pd 1.5, indicating the cross-over from the quantum critical regime to a low-temperature quantum-disordered regime as predicted by phenomenological theories of quantum phase transitions.
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