Thermodynamic signatures of geometrical frustration in clusters

We develop a comparative study of the extended Hubbard model on three-site clusters of triangular and linear geometries, searching for geometrical-frustration effects on thermodynamic properties. Using exact diagonalization, we evaluate physical quantities such as specific heat, entropy, and spin co...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2020-02, Vol.32 (7), p.075602-075602
Main Authors: Juliano, R C, Santos, E G, Gusmão, M A
Format: Article
Language:English
Subjects:
geometrical frustration
Hubbard model
thermodynamic properties
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Summary:We develop a comparative study of the extended Hubbard model on three-site clusters of triangular and linear geometries, searching for geometrical-frustration effects on thermodynamic properties. Using exact diagonalization, we evaluate physical quantities such as specific heat, entropy, and spin correlations as functions of temperature, varying interaction parameters and electron density. In particular, we highlight the existence of clear signatures of frustration in the thermal behavior of the electronic specific heat in triangular clusters, which allows us to suggest that specific-heat measurements may be an important experimental tool to detect geometrical frustration in correlated-electron systems.
ISSN:0953-8984
1361-648X
DOI:10.1088/1361-648X/ab5347