Abstracts 2010

Abstract of Publication No. 599

A. Furrer, K. W. Krämer, Th. Strässle, D. Biner, J. Hauser and H. U. Güdel
Magnetic and neutron spectroscopic properties of the tetrameric nickel compound [Mo12O28(m2-OH)9(m3-OH)3{Ni(H2O)3}4]·13H2O
Phys. Rev. B 81, 214437/1-10 (2010)      Full Text (PDF)      DOI-Link     

Abstract: We present results of inelastic neutron scattering experiments performed for the compound [Mo12O28(m2-OH)9(m3-OH)3{Ni(H2O)3}4]·13H2O, which is a molecular magnet with antiferromagnetically coupled Ni2+ ions forming nearly ideal tetrahedra in a diamagnetic molybdate matrix. The neutron spectroscopic data are analyzed together with high-field magnetization data (taken from the literature), which exhibit four steps at non-equidistant field intervals. The experimental data can be excellently described by antiferromagnetic Heisenberg-type exchange interactions as well as an axial single-ion anisotropy within a distorted tetrahedron of Ni2+ ions characterized by x-ray single-crystal diffraction. Our analysis contrasts to recently proposed models, which are based on the existence of extremely large biquadratic (and three-ion) exchange interactions and/or on a strong field dependence of the Heisenberg coupling parameters.

Last modified: 13.12.11 by Gabriela Frei