Abstracts 2003

Abstract of Publication No. 457

R. Basler, G. Chaboussant, C. Cañada-Vilalta, G. Christou, H. Mutka, S. Janssen, F. Altorfer and H.-U. Güdel
Magnetic and inelastic neutron scattering studies of a frustrated tetranuclear Mn3+ butterfly-type cluster
Polyhedron 22, 2471-2479 (2003)      Full Text (PDF)      DOI-Link     

Abstract: We report on the magnetic properties of the tetranuclear metallic cluster [Mn4O2(O2CPh)6(dpm)2]. Using susceptibility, magnetization and inelastic neutron scattering (INS) spectroscopy we have determined the exchange and anisotropy parameters. The four Mn3+ (S=2) form a tetranuclear cluster with butterfly-type geometry. The two core Mn3+ ions are strongly antiferromagnetically coupled with Jb=-4.8±0.1 meV. The outer Mn3+ ions are loosely coupled to the core spins via two different weak interactions, ferromagnetic and antiferromagnetic, respectively: Jw1=+0.1±0.01 meV and Jw2=-0.1±0.01 meV. In addition, the octahedrally coordinated outer Mn3+ ions experience a large single-ion anisotropy DSz2 with D=-0.47±0.01 meV due to a strong distortion of the MnO6 octahedra. The Landé g-factor is g=1.94±0.03. Frustration effects and competitive interactions lead to remarkable magnetic properties which cannot be unambiguously interpreted without the additional information from INS.

Last modified: 13.12.11 by Gabriela Frei