An unusually large magnetocaloric effect for the temperature region below 10 K is found for the Fe14 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 Fe14 cluster core, resulting in small cluster magnetic anisotropy, enables the occurrence of long-range antiferromagnetic order below T_N=1.87 K.
@article{arxiv.cond-mat/0507407,
title = {Spin-enhanced magnetocaloric effect in molecular nanomagnets},
author = {Marco Evangelisti and Andrea Candini and Alberto Ghirri and Marco Affronte and Euan K. Brechin and Eric J. L. McInnes},
journal= {arXiv preprint arXiv:cond-mat/0507407},
year = {2007}
}
Comments
4 pages, 3 figures, accepted for publication in Applied Physics Letters