39 research outputs found
Thermodynamics of a Bose Einstein condensate with free magnetization
We study thermodynamic properties of a gas of spin 3 52Cr atoms across Bose
Einstein condensation. Magnetization is free, due to dipole-dipole interactions
(DDIs). 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 non ferromagnetic
phase is favored. Finally we present a spin thermometry efficient even below
the degeneracy temperature.Comment: 4 pages, 4 figure
Steady-state magneto-optical trap of fermionic strontium on a narrow-line transition
A steady-state magneto-optical trap (MOT) of fermionic strontium atoms
operating on the 7.5 kHz-wide transition
is demonstrated. This MOT features atoms, a loading rate of
atoms/s, and an average temperature of 12 K. These
parameters make it well suited to serve as a source of atoms for
continuous-wave superradiant lasers operating on strontium's mHz-wide clock
transition. Such lasers have only been demonstrated using pulsed Sr sources,
limiting their range of applications. Our MOT makes an important step toward
continuous operation of these devices, paving the way for continuous-wave
active optical clocks.Comment: 11 pages, 7 figure