title: Enhancement of spin relaxation in an FeDy2 Fe coordination cluster by magnetic fields.
abstract: Two [FeLn2 Fe(μ3 -OH)2 (teg)2 (N3 )2 (C6 H5 COO)4 ] compounds (where Ln=Y(III) and Dy(III) ; teg=triethylene glycol anion) have been synthesized and studied using SQUID and Mössbauer spectroscopy. The magnetic measurements on both compounds indicate dominant antiferromagnetic interactions between the metal centers. Analysis of the (57) Fe Mössbauer spectra complement the ac magnetic susceptibility measurements, which show how a static magnetic field can quench the slow relaxation of magnetization generated by the anisotropic Dy(III) ions.
authors.affiliation: Institute of Nanotechnology, Karlsruhe Institute of Technology, Postfach 3640, 76021 Karlsruhe (Germany).
authors.forename: Guo
authors.initials: G
authors.lastname: Peng
authors.forename: Valeriu
authors.initials: V
authors.lastname: Mereacre
authors.forename: George E
authors.initials: GE
authors.lastname: Kostakis
authors.forename: Juliusz A
authors.initials: JA
authors.lastname: Wolny
authors.forename: Volker
authors.initials: V
authors.lastname: Schünemann
authors.forename: Annie K
authors.initials: AK
authors.lastname: Powell
keywords: Moessbauer spectroscopy; cooperative effects; heterometallic complexes; iron; lanthanides