title: Observation of a very large internal hyperfine field (62.4 T) in the ferromagnetically ordered state of the S = 1 alpha-iron(II) octaethyltetraazaporphyrin.
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.
authors.affiliation: Department of Chemistry, Northeastern University, Boston, Massachusetts 02115, USA.
authors.forename: W M
authors.initials: WM
authors.lastname: Reiff
authors.forename: C M
authors.initials: CM
authors.lastname: Frommen
authors.forename: G T
authors.initials: GT
authors.lastname: Yee
authors.forename: S P
authors.initials: SP
authors.lastname: Sellers