Theoretical estimates for proton-NMR spin-lattice relaxation rates of heterometallic spin rings

Details Theoretical estimates for proton-NMR spin-lattice relaxation rates of heterometallic spin rings Theoretical estimates for proton-NMR spin-lattice relaxation rates of heterometallic spin rings

2005-04-26

arxiv.org/abs/cond-mat/0504658v2

J. Magn. Magn. Mater. 302 (2006) 206-210

Physics

Condensed Matter

Materials Science

5 pages and 9 figures. Accepted for J. Magn. Magn. Mater. More information at http://www.physik.uni-osnabrueck.de/makrosysteme

Scientific paper

10.1016/j.jmmm.2005.09.006

Heterometallic molecular chromium wheels are fascinating new magnetic materials. We reexamine the available experimental susceptibility data on MCr7 wheels in terms of a simple isotropic Heisenberg Hamiltonian for M=Fe, Ni, Cu, and Zn and find in that FeCr7 needs to be described with an iron-chromium exchange that is different from all other cases. In a second step we model the behavior of the proton spin lattice relaxation rate as a function of applied magnetic field for low temperatures as it is measured in Nuclear Magnetic Resonance (NMR) experiments. It appears that CuCr7 and NiCr7 show an unexpectedly reduced relaxation rate at certain level crossings.

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