Dipolar ordering in Fe8?

Details Dipolar ordering in Fe8? Dipolar ordering in Fe8?

2000-04-13

arxiv.org/abs/cond-mat/0004215v3

Europhys. Lett. 55 (2), 273 (2001)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, no figures, submitted to EPL

Scientific paper

10.1209/epl/i2001-00331-2

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.

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