Observation of a very large internal hyperfine field (62.4 T) in the ferromagnetically ordered state of the S = 1 alpha-iron(II) octaethyltetraazaporphyrin

W M Reiff; C M Frommen; G T Yee; S P Sellers

doi:10.1021/ic990910l

Observation of a very large internal hyperfine field (62.4 T) in the ferromagnetically ordered state of the S = 1 alpha-iron(II) octaethyltetraazaporphyrin

Inorg Chem. 2000 May 15;39(10):2076-9. doi: 10.1021/ic990910l.

Authors

W M Reiff¹, C M Frommen, G T Yee, S P Sellers

Affiliation

¹ Department of Chemistry, Northeastern University, Boston, Massachusetts 02115, USA.

PMID: 12526515
DOI: 10.1021/ic990910l

Abstract

The origins of the extraordinarily large internal hyperfine field (62.4 T) for the three-dimensional (weak) ferromagnetically ordered ground state of alpha-Fe(OETAP) are discussed semiquantitatively in terms of existing physical theory. In particular, the classical Fermi-contact contribution to the internal field is found to be highly enhanced by a very large orbital contribution and a significant dipolar term of the same sign. A rationale for the unexpected ordering of this S = 1 non-Kramers system is also presented.