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MA: Magnetismus
MA 14: Molekularer Magnetismus
MA 14.3: Talk
Saturday, March 5, 2005, 14:15–14:30, TU H1012
Spin lattice relaxation rates of heterometallic wheels — •Mohammed Allalen and Jürgen Schnack — Universität Osnabrück, Fachbereich Physik, D-49069 Osnabrück, Germany
In this work we present theoretical estimates of the exchange parameters and the proton nuclear spin-lattice relaxation rate of heterometallic {Cr7M} wheels using exact diagonalization of the underlying Heisenberg Hamiltonian. Heterometallic {Cr7M} wheels are antiferromagnetically coupled molecular magnetic rings where in the original ring of eight Chromium ions (s=3/2) one ion is replaced by M=Fe, Cu, Zn or Ni with spin quantum number s=2, 1/2, 0, and s=1, respectively. One of our results is that the nearest neighbor coupling is almost not altered by substituting another paramagnetic ion with the exception of iron.