title: Spin relaxation in antiferromagnetic Fe-Fe dimers slowed down by anisotropic Dy(III) ions.
abstract: By using Mössbauer spectroscopy in combination with susceptibility measurements it was possible to identify the supertransferred hyperfine field through the oxygen bridges between Dy(III) and Fe(III) in a {Fe4Dy2} coordination cluster. The presence of the dysprosium ions provides enough magnetic anisotropy to "block" the hyperfine field that is experienced by the iron nuclei. This has resulted in magnetic spectra with internal hyperfine fields of the iron nuclei of about 23 T. The set of data permitted us to conclude that the direction of the anisotropy in lanthanide nanosize molecular clusters is associated with the single ion and crystal field contributions and (57)Fe Mössbauer spectroscopy may be informative with regard to the the anisotropy not only of the studied isotope, but also of elements interacting with this isotope.
authors.affiliation: Institute of Inorganic Chemistry, Karlsruhe Institute of Technology, Engesserstr. 15, D-76128 Karlsruhe, Germany.
authors.forename: Valeriu
authors.initials: V
authors.lastname: Mereacre
authors.affiliation: Institute of Inorganic Chemistry, Karlsruhe Institute of Technology, Engesserstr. 15, D-76128 Karlsruhe, Germany.
authors.forename: Frederik
authors.initials: F
authors.lastname: Klöwer
authors.affiliation: Institute of Inorganic Chemistry, Karlsruhe Institute of Technology, Engesserstr. 15, D-76128 Karlsruhe, Germany.
authors.forename: Yanhua
authors.initials: Y
authors.lastname: Lan
authors.affiliation: CNRS, CRPP, UPR 8641, F-33600 Pessac, France ; Univ Bordeaux, CRPP, UPR 8641, F-33600 Pessac, France.
authors.forename: Rodolphe
authors.initials: R
authors.lastname: Clérac
authors.affiliation: Institute of Physics, University of Kaiserslautern, Erwin Schrödingerstr. 56, D-67653 Kaiserslautern, Germany.
authors.forename: Juliusz A
authors.initials: JA
authors.lastname: Wolny
authors.affiliation: Institute of Physics, University of Kaiserslautern, Erwin Schrödingerstr. 56, D-67653 Kaiserslautern, Germany.
authors.forename: Volker
authors.initials: V
authors.lastname: Schünemann
authors.affiliation: Institute of Inorganic Chemistry, Karlsruhe Institute of Technology, Engesserstr. 15, D-76128 Karlsruhe, Germany.
authors.forename: Christopher E
authors.initials: CE
authors.lastname: Anson
authors.affiliation: Institute of Inorganic Chemistry, Karlsruhe Institute of Technology, Engesserstr. 15, D-76128 Karlsruhe, Germany ; Institute of Nanotechnology, Karlsruhe Institute of Technology, Postfach 3640, D-76021 Karlsruhe, Germany.
authors.forename: Annie K
authors.initials: AK
authors.lastname: Powell
keywords: Mössbauer spectroscopy; anisotropy; dysprosium; iron