1. Magnetocaloric effect in spin-degenerated molecular nanomagnets
- Author
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A. Candini, Richard T. Scott, Marco Evangelisti, Edoardo Pasca, L.J. de Jongh, Euan K. Brechin, and Marco Affronte
- Subjects
Physics ,Condensed matter physics ,Molecular magnets ,Spin states ,Molecular nanomagnets ,molecular magnetism ,spin dynamics ,Approx ,Condensed Matter Physics ,MAGNETIC REFRIGERATION ,CLUSTERS ,Nanomagnet ,Electronic, Optical and Magnetic Materials ,Magnetic field ,magnetic cooling ,effetto magnetocalorico ,Magnetic refrigeration ,manganese ,nanostructured materials ,entropy ,nanomagnetics ,Adiabatic process - Abstract
For molecular nanomagnets, excesses of magnetic entropy at finite low temperatures are induced by degrees of freedom resulting from macroscopic degeneracies of the molecular spin states. We experimentally demonstrate that this effect can be huge and efficiently exploited for enhancing the magnetic field dependence of the adiabatic temperature change. We specifically consider the ${\text{Mn}}_{32}$ molecular nanomagnet, proving it to be an excellent magnetic refrigerant below $T\ensuremath{\approx}2\text{ }\text{K}$, due almost entirely to its spin degeneracy.
- Published
- 2009
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