We present magnetic susceptibility, 1H nuclear magnetic resonance (NMR) spectra, spin-spin- and spin-lattice-relaxation rates data, collected in the temperature range 1.65<T<300 K at two applied magnetic fields H=0.35 and 1.5 T, on a single crystal of Cr7Fe heterometallic molecular nanomagnet. From a simple analysis of the magnetic susceptibility data, we deduce that the ring has a magnetic total spin ST =1/2 ground state and Cr-Cr antiferromagnetic (AFM) exchange interactions comparable to similar Cr7 M heterometallic rings. The proton NMR data indicate that the main coupling between nuclei and electronic moments is of dipolar origin. The spin-lattice-relaxation rate behavior is qualitatively explained by a model which assumes a single-correlation time as used previously for homometallic AFM rings. The direct comparison of the relaxation data in Cr 7 Fe and Cr8 shows a substantial change in the spin dynamics as the result of Fe replacing one Cr ion. The difference is attributed to the change in the elastic properties of the sample with Fe substitution and/or to the multi-Lorentzian behavior of the spin-spin correlation function resulting from the presence of inequivalent ions in the heterometallic ring.

Magnetic properties and spin dynamics in the Cr7Fe nanomagnet : a heterometallic antiferromagnetic molecular ring / H. Amiri Doumari, M. Mariani, A. Lascialfari, F. Borsa, G.A. Timco, F. Tuna, R.E.P. Winpenny. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 81:10(2010), p. 104408.104408. [10.1103/PhysRevB.81.104408]

Magnetic properties and spin dynamics in the Cr7Fe nanomagnet : a heterometallic antiferromagnetic molecular ring

H. Amiri Doumari;A. Lascialfari;
2010

Abstract

We present magnetic susceptibility, 1H nuclear magnetic resonance (NMR) spectra, spin-spin- and spin-lattice-relaxation rates data, collected in the temperature range 1.65
Settore FIS/01 - Fisica Sperimentale
Settore FIS/03 - Fisica della Materia
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/141552
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