Spin-enhanced magnetocaloric effect in molecular nanomagnets

被引：156
作者：
Evangelisti, M [1 ]
Candini, A
Ghirri, A
Affronte, M
Brechin, EK
McInnes, EJL
机构：
[1] Univ Modena & Reggio Emilia, CNR, INFM, Natl Res Ctr Nanostruct & Biosyst Surfaces, I-41100 Modena, Italy
[2] Univ Modena & Reggio Emilia, Dipartimento Fis, I-41100 Modena, Italy
[3] Univ Edinburgh, Dept Chem, Edinburgh EH9 3JJ, Midlothian, Scotland
[4] Univ Manchester, Dept Chem, Manchester M13 9PL, Lancs, England
来源：
APPLIED PHYSICS LETTERS | 2005年 / 87卷 / 07期
关键词：
D O I：
10.1063/1.2010604
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
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. (C) 2005 American Institute of Physics.
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