Characteristic Crossing Points in Specific Heat Curves of Correlated   Systems
  Attention is drawn to the observation that in many correlated systems (e.g. 3He, heavy fermion systems and Hubbard models) the specific heat curves, when plotted for different values of some thermodynamic variable (e.g. pressure, magnetic field, interaction), cross almost precisely at one or two characteristic temperatures. A quantitative explanation of this phenomenon, based on the temperature dependence of the associated generalized susceptibilities, is presented. 
D. Vollhardt (RWTH Aachen)