Dresden 2006 – scientific programme
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MA: Magnetismus
MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)
MA 20.150: Poster
Tuesday, March 28, 2006, 15:15–19:15, P1
Magnetic and electronic properties of the iron-containing polyoxotungstate [Fe4(H2O)10(β-SbW9O33)2]6− — •M. Prinz1, A. F. Takács1, J. Schnack1, I. Balasz2, E. Burzo2, U. Kortz3, and M. Neumann1 — 1University of Osnabrück, Department of Physics, Barbarastr. 7, D-49069 Osnabrück, Germany — 2Babeş-Bolyai University, Faculty of Physics, RO-400084 Cluj-Napoca, Romania — 3International University Bremen, P.O. Box 750561, D-28725 Bremen, Germany
New materials based on polyoxometalates (metal-oxygen clusters) are promising stages of development in nano/micro electronic applications that can lead to the emergence of a new technology. Magnetic and X-ray photoelectron spectroscopic (XPS) studies on the transition metal substituted, dimeric polyoxotungstate [Fe4(H2O)10(β-SbW9O33)2]6− are reported. Magnetic measurements of the salt Cs6[Fe4(H2O)10(β-SbW9O33)2], containing Fe3+ ions, show a magnetization of approximately 10 µB/f.u. at T = 4.2 K and B = 9 T without saturation and were analysed by using an isotropic Heisenberg Hamiltonian. The ground state of the frustrated molecule has a total spin of S = 2. The XPS Fe 2p spectra suggest a 2+ formal valence state indicating that charge-transfer effects are involved.