Modelling the properties of magnetic clusters with complex structures: how symmetry can help us
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TSUKERBLAT, Boris; PALII, Andrew; CLEMENTE-JUAN, Juan; CORONADO, Eugenio. Modelling the properties of magnetic clusters with complex structures: how symmetry can help us. In: International Reviews in Physical Chemistry. 2020, nr. 2(39), pp. 217-265. ISSN 0144-235X.
10.1080/0144235X.2020.1764778
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International Reviews in Physical Chemistry
Numărul 2(39) / 2020 / ISSN 0144-235X /ISSNe 1366-591X

Modelling the properties of magnetic clusters with complex structures: how symmetry can help us


DOI: 10.1080/0144235X.2020.1764778
Pag. 217-265

Tsukerblat Boris1, Palii Andrew, Clemente-Juan Juan2, Coronado Eugenio2
 
1 Universitatea Ben-Gurion din Negev,
2 Universitat de València
 
Disponibil în IBN: 16 octombrie 2020


Rezumat

The purpose of this article is to answer the question of how symmetry helps us to investigate and understand the properties of nanoscopic magnetic clusters with complex structures. The systems of choice will be the three types of polyoxometalates (POMs): (1) POMs containing localised spins; (2) reduced mixed-valence (MV) POMs; (3) partially delocalised POMs in which localised and delocalised subunits coexist and interact. The theoretical tools based on various kinds of symmetry are the following: (1) irreducible tensor operator (ITO) approach based on the so-called “spin-symmetry” and MAGPACK program; (2) group-theoretical assignment of the exchange multiplets based on spin- and point symmetries; (3) group-theoretical classification of the delocalised electronic and electron-vibrational states of MV POMs; (4) general approach (based on spin symmetry) to evaluate the energy levels of large MV clusters and the corresponding MVPACK program; (5) computational approach (employing point symmetry) to solve multidimensional non-adiabatic vibronic problems in the nanoscopic systems realized as VIBPACK software. We made it our goal to avoid a conventional deductive style of presentation. On the contrary, we first consider specially selected complex POMs and then show by what methods and in what way the theoretical problems arising in the description of the properties of these molecules can be properly solved.

Cuvinte-cheie
antisymmetric exchange, double exchange, Exchange interactions, irreducible tensor operators, Jahn–Teller effect, Magnetic anisotropy, magnetic clusters, mixed-valency, molecular magnetism, polyoxometalates, polyoxovanadates, spin frustration, spin rings, symmetry, vibronic coupling