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1H nuclear magnetic resonance and spin dynamics in the tetranuclear iron(III) cluster {Fe4}

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6 Author(s)
Procissi, D. ; Ames Laboratory, Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 ; Suh, B.J. ; Lascialfari, A. ; Borsa, F.
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The spin dynamics of a cluster of four iron(III) ions characterized by a total spin ground state ST=5 and Ising anisotropy have been investigated by the 1H nuclear magnetic resonance (NMR) linewidth and 1H NMR spin-lattice relaxation rate 1/T1 as a function of the temperature (0.5–295 K) and external magnetic field (0.3–7.2 T). At very low T (0.5 K) the spectrum becomes very broad indicating freezing of the Fe3+ moments in a superparamagnetic state. The temperature dependence of T1-1 and T2-1 shows strong field dependent enhancement below 50 K which must be related to the spin dynamics of the Fe3+ moment freezing process, although no quantitative theory of this is currently available. © 2002 American Institute of Physics.

Published in:

Journal of Applied Physics  (Volume:91 ,  Issue: 10 )

Date of Publication:

May 2002

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