  Specific heat versus temperature curves for various pressures, or magnetic
fields (or some other external control parameter) have been seen to cross at a
point or in a very small range of temperatures in many correlated fermion
systems. We show that this behavior is related to the vicinity of a quantum
critical point in these systems which leads to a crossover at some temperature
T^* from quantum to classical fluctuation regime. The temperature at which the
curves cross turns out to be near T^*. We have discussed the case of the normal
phase of liquid Helium three and the heavy fermion systems CeAl3 and UBe13 in
detail within the spin fluctuation theory. When the crossover scale is any
homogeneous function of these control parameters there is always crossing at a
point.
