63Cu nuclear relaxation in the quantum critical point system CeCu5.9Au0.1.
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.
Walstedt
R E
RE
Department of Physics, Rutgers University, Piscataway, New Jersey 08855, USA.
Kojima
H
H
Butch
N
N
Bernhoeft
N
N