Crossing of Specific Heat Curves in Liquid Helium 3 and Heavy Fermion Systems

Specific heat curves for various pressures, in many correlated electron systems, have been seen to cross at a point. We analyze this behavior using the spin fluctuation theory. It is found that when the system is considered near a ferromagnetic instability, the curves cross at one point and for systems near an antiferromagnetic instability, they cross at two points. The crossing behavior is related to the crossover of these systems from quantum to classical fluctuation regimes.