Study of the ground state and thermodynamic properties of Cu5-NIPA-like molecular nanomagnets

The thermodynamic properties of a spatially anisotropic spin-1/2 Heisenberg model for a Cu5 pentameric molecule is studied through exact diagonalization. The elementary geometry of the finite lattice is defined on nanomolecules consisting of an hourglass structure of two corner-sharing scalene trian...

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Veröffentlicht in:Journal of magnetism and magnetic materials 2022-06, Vol.552, p.169151, Article 169151
Hauptverfasser: Torrico, J., Plascak, J.A.
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Sprache:eng
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Zusammenfassung:The thermodynamic properties of a spatially anisotropic spin-1/2 Heisenberg model for a Cu5 pentameric molecule is studied through exact diagonalization. The elementary geometry of the finite lattice is defined on nanomolecules consisting of an hourglass structure of two corner-sharing scalene triangles which are related by inversion symmetry. This microscopic magnetic model is quite suitable to describe the molecular nanomagnetic compound Cu5-NIPA. The ground-state phase diagram, as well as the corresponding total magnetization, are obtained as a function of the anisotropic exchange interactions and the external magnetic field. The thermodynamic behavior of the model at finite temperatures is also studied and the corresponding magnetocaloric effects are analyzed for various values of the Hamiltonian parameters. •Thermodynamic properties of large molecules and nano-magnets.•Cu-5NIPA like magnetic molecules.•Direct and inverse magneto caloric effects.•Quantum phase diagram of zero-dimensional magnetic systems.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2022.169151