epl draft Dipolar needles in the microcanonical ensemble: evidence of spontaneous magnetization and ergodicity breaking


We have studied needle shaped three-dimensional classical spin systems with purely dipolar interactions in the microcanonical ensemble, using both numerical simulations and analytical approximations. We have observed spontaneous magnetization for different finite cubic lattices. The transition from the paramagnetic to the ferromagnetic phase is shown to be… (More)


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