title: Kondo scaling in the optical response of YbIn1-xAgxCu4.
abstract: Theoretical work on Kondo systems predicts universality in the scaling of observable quantities with the Kondo temperature, T(K). Here we report infrared-frequency optical response measurements of the correlated system YbIn(1-x)AgxCu4. We observe that x-dependent variations in the frequency and strength of a low-energy excitation are related to the x-dependent Kondo temperature. Comparison of the inferred trends with existing theory and a model calculation provides a framework in which to view these experimental results as scaling phenomena arising from local-moment/conduction electron hybridization.
authors.affiliation: Physics Department, University of California-Santa Cruz, Santa Cruz, CA 95064, USA.
authors.forename: Jason N
authors.initials: JN
authors.lastname: Hancock
authors.forename: Tim
authors.initials: T
authors.lastname: McKnew
authors.forename: Zack
authors.initials: Z
authors.lastname: Schlesinger
authors.forename: John L
authors.initials: JL
authors.lastname: Sarrao
authors.forename: Zach
authors.initials: Z
authors.lastname: Fisk