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We use inelastic neutron scattering to measure the magnetic fluctuations in asingle crystal of the heavy fermion alloy CeCu_5.9Au_0.1 close to theantiferromagnetic quantum critical point. The energy and temperature-dependentspectra obey (E/T) scaling at Q near (1,0,0). The neutron data and earlier bulksusceptibility are consistent with the form 1/X ~ f(Q)+(-iE+bT)^a, with ananomalous exponent a=0.8. We confirm the earlier observation of quasi-lowdimensionality and show how both the magnetic fluctuations and thethermodynamics can be understood in terms of a quantum Lifshitz point.Comment: Latex file with two postscript figure

Scaling of Magnetic Fluctuations near a Quantum Phase Transition