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Santini P, Carretta S, Liviotti E, et al. NMR as a probe of the relaxation of the magnetization in magnetic molecules. Phys Rev Lett. 2005;94(7):077203doi: 10.1103/PhysRevLett.94.077203.
Santini, P., Carretta, S., Liviotti, E., Amoretti, G., Carretta, P., Filibian, M., Lascialfari, A., & Micotti, E. (2005). NMR as a probe of the relaxation of the magnetization in magnetic molecules. Physical review letters, 94(7), 077203. https://doi.org/10.1103/PhysRevLett.94.077203
Santini, P, et al. "NMR as a probe of the relaxation of the magnetization in magnetic molecules." Physical review letters vol. 94,7 (2005): 077203. doi: https://doi.org/10.1103/PhysRevLett.94.077203
Santini P, Carretta S, Liviotti E, Amoretti G, Carretta P, Filibian M, Lascialfari A, Micotti E. NMR as a probe of the relaxation of the magnetization in magnetic molecules. Phys Rev Lett. 2005 Feb 25;94(7):077203. doi: 10.1103/PhysRevLett.94.077203. Epub 2005 Feb 23. PMID: 15783849.
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Phys Rev Lett. 2005 Feb 25;94(7):077203. doi: 10.1103/PhysRevLett.94.077203. Epub 2005 Feb 23.

NMR as a probe of the relaxation of the magnetization in magnetic molecules.

Physical review letters

P Santini, S Carretta, E Liviotti, G Amoretti, P Carretta, M Filibian, A Lascialfari, E Micotti

Affiliations

  1. INFM and Dipartimento di Fisica, Università di Parma, I-43100 Parma, Italy.

PMID: 15783849 DOI: 10.1103/PhysRevLett.94.077203

Abstract

We investigate the time autocorrelation of the molecular magnetization M(t) for three classes of magnetic molecules (antiferromagnetic rings, grids, and nanomagnets), in contact with the phonon heat bath. For all three classes, we find that the exponential decay of the fluctuations of M(t) is characterized by a single characteristic time tau(T,B) for not too high temperature T and field B. This is reflected in a nearly single-Lorentzian shape of the spectral density of the fluctuations. We show that such fluctuations are effectively probed by NMR, and that our theory explains the recent phenomenological observation by Baek et al. [Phys. Rev. B 70, 134434 (2004)] that the Larmor-frequency dependence of 1/T(1) data in a large number of AFM rings fits to a single-Lorentzian form.

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