Data di Pubblicazione:
2013
Citazione:
Relaxation dynamics in a Fe7 nanomagnet / E. Garlatti, S. Carretta, P. Santini, G. Amoretti, M. Mariani, A. Lascialfari, S. Sanna, K. Mason, J. Chang, P. Tasker, E. K. Brechin. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 87:5(2013), pp. 054409.1-054409.7. [10.1103/PhysRevB.87.054409]
Abstract:
We investigate the phonon-induced relaxation dynamics in the Fe
7
magnetic molecule, which is made of
two Fe
3
+
triangles bridged together by a central Fe
3
+
ion. The competition between different antiferromagnetic
exchange interactions leads to a low-spin ground state multiplet with a complex pattern of low-lying excited
levels. We theoretically investigate the decay of the time correlation function of molecular observables, such as the
cluster magnetization, due to the spin-phonon interaction. We find that more than one time contributes to the decay
of the molecular magnetization. The relaxation dynamics is probed by measurements of the nuclear spin-lattice
relaxation rate 1
/T
1
. The interpretation of these measurements allows the determination of the magnetoelastic
coupling strength and to set the scale factor of the relaxation dynamics time scales. In our theoretical interpretation
of 1
/T
1
data we also take into account the wipeout effect at low temperatures
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
E. Garlatti, S. Carretta, P. Santini, G. Amoretti, M. Mariani, A. Lascialfari, S. Sanna, K. Mason, J. Chang, P. Tasker, E.K. Brechin
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