Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2000-03-23
Phys. Rev. B 63, 134409 (2001)
Physics
Condensed Matter
Strongly Correlated Electrons
10 pages (RevTeX 4) including 11 eps figures. To appear in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.63.134409
We have developed a new method for evaluating the specific heat of lattice spin systems. It is based on the knowledge of high-temperature series expansions, the total entropy of the system and the low-temperature expected behavior of the specific heat as well as the ground-state energy. By the choice of an appropriate variable (entropy as a function of energy), a stable interpolation scheme between low and high temperature is performed. Contrary to previous methods, the constraint that the total entropy is log(2S+1) for a spin S on each site is automatically satisfied. We present some applications to quantum spin models on one- and two- dimensional lattices. Remarkably, in most cases, a good accuracy is obtained down to zero temperature.
Bernu Bernard
Misguich Grégoire
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