Crossing of Specific Heat Curves in some correlated Fermion systems

Details Crossing of Specific Heat Curves in some correlated Fermion systems Crossing of Specific Heat Curves in some correlated Fermion systems

1999-02-08

arxiv.org/abs/cond-mat/9902098v1

Physics

Condensed Matter

Strongly Correlated Electrons

File Revtex, 4 pages, 4 eps figures included

Scientific paper

10.1007/s100510050131

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.

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