Thermodynamics of a Bose-Einstein condensate with free magnetization

Thermodynamics of a Bose-Einstein condensate with free magnetization

We study thermodynamic properties of a gas of spin 3(52)Cr atoms across Bose-Einstein condensation. Magnetization is free, due to dipole-dipole interactions. We show that the critical temperature for condensation is lowered at extremely low magnetic fields, when the spin degree of freedom is thermal...

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Veröffentlicht in:Physical review letters 2012-01, Vol.108 (4), p.045307-045307, Article 045307
Hauptverfasser: Pasquiou, B, Maréchal, E, Vernac, L, Gorceix, O, Laburthe-Tolra, B
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Condensed Matter
Physics
Quantum Gases
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creator Pasquiou, B
Maréchal, E
Vernac, L
Gorceix, O
Laburthe-Tolra, B
description We study thermodynamic properties of a gas of spin 3(52)Cr atoms across Bose-Einstein condensation. Magnetization is free, due to dipole-dipole interactions. We show that the critical temperature for condensation is lowered at extremely low magnetic fields, when the spin degree of freedom is thermally activated. The depolarized gas condenses in only one spin component, unless the magnetic field is set below a critical value, below which a nonferromagnetic phase is favored. Finally, we present a spin thermometry efficient even below the degeneracy temperature.
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subjects Condensed Matter
Physics
Quantum Gases
title Thermodynamics of a Bose-Einstein condensate with free magnetization
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