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La participation à la gestion et aux bénéfices
No full textMalatesta Errico, Tassi Armando. La participation à la gestion et aux bénéfices. In: Autogestion et socialisme : études, débats, documents, N°26-27, 1974. Mouvements ouvriers de gestion et d’action directe en Italie. pp. 71-76
Magnetization steps in nanomagnets induced by a time-dependent magnetic field: Application to Fe4
No full textUpward renormalization of the antiferromagnetic mode in the paramagnetic phase of CsMnBr_3
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Relaxation time of the nanomagnet Fe4
No full textThe magnetic behaviour of the molecular nanomagnet Fe4 is very well simulated by a single spin model Hamiltonian in a crystal field with S=5. The crystal field parameters were determined from the inelastic neutron scattering (INS) spectra. Here we show that the quantum effects are crucial to understand the saturation of the relaxation time observed at very low temperature at variance with the standard master equation result that leads to an Arrhenius law at any temperature. Very deep downward spikes in correspondence of the anticrossing fields are found in the relaxation time versus field at low temperature. We compare our results with those obtained by previous approaches worked out to fit experimental data on Mn12
Monte Carlo simulations on a triangular Ising antiferromagnet with nearest and next-nearest interactions
No full textPhase diagram of the square planar model with long range isotropic antiferromagnetic and dipolar interactions
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