title: 63Cu nuclear relaxation in the quantum critical point system CeCu5.9Au0.1.
abstract: 63Cu NQR measurements of the 63Cu T1 are reported for the quantum critical point system CeCu5.9Au0.1 over temperatures ranging from 0.1 up to 4.2 K. Below approximately 1 K the magnetization recovery exhibits a stable, nonexponential decay function which we believe signals the onset of 2D quantum critical fluctuations, as has been noted in the literature. We find T1(-1) is proportional to T0.75 for the region T < 1 K. The observed temperature dependence is in agreement with a phenomenological model of non-Fermi liquid behavior based on the uniform susceptibility but is inconsistent with calculations based on susceptibility peaks identified via neutron scattering experiments.
authors.affiliation: Department of Physics, Rutgers University, Piscataway, New Jersey 08855, USA.
authors.forename: R E
authors.initials: RE
authors.lastname: Walstedt
authors.forename: H
authors.initials: H
authors.lastname: Kojima
authors.forename: N
authors.initials: N
authors.lastname: Butch
authors.forename: N
authors.initials: N
authors.lastname: Bernhoeft