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Can a gas of spin-up and spin-down fermions become ferromagnetic due to because of repulsive interactions? This We addressed this question, for which has there is not yet found a definitive
theoretical answer was addressed , in an experiment with an ultracold twocomponent two-component Fermi gas. The observation of non-monotonic nonmonotonic behavior of lifetime,
kinetic energy, and size for increasing repulsive interactions provides strong evidence for a phase transition to a ferromagnetic state. It implies Our observations imply that itinerant
ferromagnetism of delocalized fermions is possible without lattice and band structure, and validates our data validate the most basic model for ferromagnetism introduced
by Stoner.
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