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arXiv · 1604.02729

Thermal Global Expansion Coefficient Measurement for a Harmonic Trapped Gas Across Bose-Einstein Condensation

E. D. Mercado-Gutierrez·F. J. Poveda-Cuevas·Vanderlei S. Bagnato
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Abstract

We report the measurement of the global thermal expansion coefficient of a confined Bose gas of $^{87}\rm Rb$ in a harmonic potential around the Bose-Einstein condensation transition temperature. We use the concept of global thermodynamic variables, previously introduced and appropriated for a non-homogeneous system. We observe the behavior of the thermal expansion coefficient above and below the critical temperature showing the lambda-like shape present in superfluid helium. The study demonstrates the potentiality of global thermodynamic variables for the investigation of properties across the critical temperature and a new way to study the thermodynamic properties of the quantum systems.

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E. D. Mercado-Gutierrez, F. J. Poveda-Cuevas, Vanderlei S. Bagnato. 2020-06-24. Thermal Global Expansion Coefficient Measurement for a Harmonic Trapped Gas Across Bose-Einstein Condensation. https://doi.org/10.1007/s13538-018-0593-5

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