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

Abstract

We report the measurement of the global thermal expansion coefficient of a confined Bose gas of ${}^{87}\mathrm{Rb}$ 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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References in corpus (3)

• Thermodynamics of ultracold trapped gases. Generalized mechanical variables, equation of state and heat capacity
• Measuring The Heat Capacity in a Bose-Einstein Condensation using Global Variables
• Isothermal compressibility determination across Bose-Einstein condensation