2022/02/26 by J. Torrico, J. A. Plascak
Materials Science · Mathematics · Physics and Astronomy · #Anisotropy #Antiferromagnetism #Condensed matter physics #Ground state #Hamiltonian (control theory) #Heisenberg model #Lanthanide and Transition Metal Complexes #Magnetic field #Magnetic refrigeration #Magnetism in coordination complexes #Magnetization #Mathematics #Nanomagnet #Organic and Molecular Conductors Research #Phase (matter) #Phase diagram #Physics #Quantum mechanics #cond-mat.str-el
paper · pdf · doi:10.1016/j.jmmm.2022.169151
10 pages, 12 figures
openalex publication_date 2022/02/26 · openalex created_date 2022/03/02 · arxiv created 2022/03/04 · arxiv updated 2022/03/07 · openalex updated_date 2026/08/05
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.