An unusually large magnetocaloric effect for the temperature region below 10 K is found for the Fe-14 molecular nanomagnet. This is to large extent caused by its extremely large spin S ground state combined with an excess of entropy arising from the presence of low-lying excited S states. We also show that the highly symmetric Fe-14 cluster core, resulting in small cluster magnetic anisotropy, enables the occurrence of long-range antiferromagnetic order below T-N=1.87 K.
Spin-enhanced magnetocaloric effect in molecular nanomagnets / Evangelisti, M; Candini, A; Ghirri, A; Affronte, Marco; Brechin, Ek; Mcinnes, Ejl. - In: APPLIED PHYSICS LETTERS. - ISSN 0003-6951. - STAMPA. - 87:7(2005), pp. 072504-072507. [10.1063/1.2010604]
Spin-enhanced magnetocaloric effect in molecular nanomagnets
AFFRONTE, Marco;
2005
Abstract
An unusually large magnetocaloric effect for the temperature region below 10 K is found for the Fe-14 molecular nanomagnet. This is to large extent caused by its extremely large spin S ground state combined with an excess of entropy arising from the presence of low-lying excited S states. We also show that the highly symmetric Fe-14 cluster core, resulting in small cluster magnetic anisotropy, enables the occurrence of long-range antiferromagnetic order below T-N=1.87 K.Pubblicazioni consigliate
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