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

Autor(en): Allalen, M
Schnack, J 
Stichwörter: ANTIFERROMAGNETIC RING; antiferromagnetism; CR-8; DYNAMICS; Heisenberg model; MAGNETIC-ANISOTROPY; Materials Science; Materials Science, Multidisciplinary; MOLECULAR FERRIC WHEELS; molecular magnets; Physics; Physics, Condensed Matter; spin rings
Erscheinungsdatum: 2006
Herausgeber: ELSEVIER SCIENCE BV
Journal: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volumen: 302
Ausgabe: 1
Startseite: 206
Seitenende: 210
Zusammenfassung: 
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. (c) 2005 Elsevier B.V. All rights reserved.
ISSN: 03048853
DOI: 10.1016/j.jmmm.2005.09.006

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