Giant isotope effect in the incoherent tunneling specific heat of the molecular nanomagnet Fe8

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dc.creatorEvangelisti, M.
dc.creatorLuis, F.
dc.creatorMettes, F. L.
dc.creatorSessoli, R.
dc.creatorde Jongh, L. J.
dc.date2005-08-01
dc.date2005-10-07
dc.date.accessioned2026-07-07T06:41:29Z
dc.date.available2026-07-07T06:41:29Z
dc.descriptionTime-dependent specific heat experiments on the molecular nanomagnet Fe8 and the isotopic enriched analogue 57Fe8 are presented. The inclusion of the 57Fe nuclear spins leads to a huge enhancement of the specific heat below 1 K, ascribed to a strong increase in the spin-lattice relaxation rate Gamma arising from incoherent, nuclear-spin-mediated magnetic quantum tunneling in the ground-doublet. Since Gamma is found comparable to the expected tunneling rate, the latter process has to be inelastic. A model for the coupling of the tunneling levels to the lattice is presented. Under transverse field, a crossover from nuclear-spin-mediated to phonon-induced tunneling is observed.
dc.descriptionReplaced with version accepted for publication in Physical Review Letters
dc.identifierhttps://arxiv.org/abs/cond-mat/0508048
dc.identifierhttp://arxiv.org/abs/cond-mat/0508048
dc.identifierPhys. Rev. Lett. 95, 227206 (2005)
dc.identifierdoi:10.1103/PhysRevLett.95.227206
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/101682
dc.subjectMesoscale and Nanoscale Physics
dc.titleGiant isotope effect in the incoherent tunneling specific heat of the molecular nanomagnet Fe8
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