We show that the low-temperature physics of molecular nanomagnets, contrary to the prevailing one-molecule picture, must be determined by the long-range magnetic ordering due to many-body dipolar interactions. The calculations here performed, using Ewald's summation, suggest a ferromagnetic ground state with a Curie temperature of about 130 mK. The energy of this state is quite close to those of an antiferromagnetic state and to a glass of frozen spin chains. The latter may be realized at finite temperature due to its high entropy.
@article{arxiv.cond-mat/0004215,
title = {Dipolar ordering in Fe8?},
author = {X. Martinez-Hidalgo and E. M. Chudnovsky and A. Aharony},
journal= {arXiv preprint arXiv:cond-mat/0004215},
year = {2009}
}