Thermodynamic properties of a Hubbard model on a cubic cluster - exact diagonalization study at quarter filling
Journal Title: Bulletin de la Société des sciences et des lettres de Łódź, Série: Recherches sur les déformations - Year 2016, Vol 0, Issue 1
Abstract
We study the thermodynamics of a zero-dimensional, cubic cluster described with a Hubbard Hamiltonian, focusing our interest on the magnetic properties. The range in which the studied cluster is paramagnetic is considered. The results are obtained by means of ex- act numerical diagonalization. Such thermodynamic quantities as entropy, specific heat, magnetic susceptibility, spin-spin correlations and double occupancy are discussed. Partic- ular emphasis is put on the behaviour of local maxima of specific heat and susceptibility, which are analysed in terms of Schottky anomalies.
Authors and Affiliations
Karol Szałowski, Tadeusz Balcerzak, Michal Jaščur, Andrej Bobák, Milan Žukovič
Keywords
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