Phys. Rev. Lett. 95, 230403 (2005) [4 pages]Itinerant Ferromagnetism in an Ultracold Atom Fermi GasReceived 18 April 2005; published 29 November 2005 We address the possible occurrence of ultracold atom ferromagnetism by evaluating the free energy of a spin polarized Fermi gas to second order in its interaction parameter. We find that Hartree-Fock theory underestimates the tendency toward ferromagnetism, predict that the ferromagnetic transition is first order at low temperatures, and point out that the spin coherence time of gases prepared in a ferromagnetic state is strongly enhanced as the transition is approached. We relate our results to recent experiments. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.230403
DOI:
10.1103/PhysRevLett.95.230403
PACS:
71.10.Ca, 03.75.Ss, 32.80.Pj
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