The properties of quantum critical points is a topic of current interest and research. However, many systems which are believed to display quantum critical phenomena also contain significant structural disorder making the underlying properties difficult to disentangle. YbRh2Si2 is an ideal example of a metallic stoichiometric system located near a magnetic field induced quantum critical point. This material shows strong non-Fermi liquid behavior and a significant change in the Hall number in the vicinity of the critical point. This talk will outline many of the underlying magnetic properties of YbRh2Si2 found through the use of neutron inelastic scattering. Studies as a function of both temperature and magnetic field will be compared with band structure calculations and other metallic magnetic systems.
ISIS Facility, Rutherford Appleton Labs