Crossover analyses of heat capacity and susceptibility measurements near the super(3)He liquid-gas critical point

• Published in: Journal of low temperature physics Vol. 121; no. 5-6; pp. 633 - 642
• Main Authors: Barmatz, M, Hahn, Inseob, Zhong, Fang, Anisimov, M A, Agayan, V A
• Format: Journal Article
• Language: English
• Published: 01.12.2000
• ISSN: 0022-2291

An experiment called MISTE (Microgravity Scaling Theory Experiment) is being developed for a future mission on the International Space Station. The main objective of this flight experiment is to perform in-situ PVT, heat capacity at constant volume, C sub(V), and isothermal susceptibility, Chi sub(T), measurements in the asymptotic region of the super(3)He liquid-gas critical point. On the ground, gravity induces a density gradient that does not permit an accurate test of theoretical predictions within the asymptotic region. In preparation for this flight experiment, precision ground-based measurements are now being performed in the crossover region away from the critical point to determine the crossover parameters. Recent C sub(V) and Chi sub(T) measurements along the critical isochore have been analyzed using a new crossover parametric equation-of-state and a field theoretical Renormalization Group calculation based upon the phi super(4) model. A description of the experimental techniques and preliminary results of the theoretical analyses will be presented.