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

TL;DR

This paper explains the crossing of specific heat curves in liquid helium-3 and heavy fermion systems using spin fluctuation theory, linking it to quantum-classical crossover near magnetic instabilities.

Contribution

It provides a theoretical explanation for the crossing points of specific heat curves based on proximity to ferromagnetic or antiferromagnetic instabilities.

Findings

Curves cross at one point near ferromagnetic instability.

Curves cross at two points near antiferromagnetic instability.

Crossing behavior is related to quantum to classical fluctuation crossover.

Abstract

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.