Low temperature specific heat of the molecular cluster Fe$_{8}$: contribution of the local field

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We present low temperature specific heat and ac-susceptibility measurements on Fe$_{8}$ powdered sample. Below 1.3 K, superparamagnetic blocking effects as well as an excess specific heat contribution are evident. The latter is attributed to a splitting of the ground state doublet in an inhomogeneous local field of hyperfine and dipolar origin. The local field contributions are evident in the resonances observed in the field dependent ac-susceptibility and specific heat below 0.5 K. The low temperature Schottky contribution allowed us to check the crystal field parameters of effective spin Hamiltonians, recently proposed to simulate EPR and inelastic neutron scattering experiments.
16 pages, 6 figures, submitted to PRB

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Mesoscale and Nanoscale Physics

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http://salesiana.dossiersoluciones.com/handle/123456789/30062

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/9912224
 http://arxiv.org/abs/cond-mat/9912224

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arXiv