  An important problem in contemporary physics concerns quantum-critical
fluctuations in metals. A scaling function for the momentum, frequency,
temperature and magnetic field dependence of the correlation function near a
2D-ferromagnetic quantum-critical point (QCP) is constructed, and its
singularities are determined by comparing to the recent calculations of the
correlation functions of the dissipative quantum XY model (DQXY). The
calculations are motivated by the measured properties of the metallic compound
YFe$_2$Al$_{10}$, which is a realization of the DQXY model in 2D. The
frequency, temperature and magnetic field dependence of the scaling function as
well as the singularities measured in the experiments are given by the theory
without adjustable exponents. The same model is applicable to the
superconductor-insulator transitions, classes of metallic AFM-QCPs, and as
fluctuations of the loop-current ordered state in hole-doped cuprates. The
results presented here lend credence to the solution found for the 2D-DQXY
model, and its applications in understanding quantum-critical properties of
diverse systems.
