The phase diagram and magnetization of super fluid 3HE

The procedure and results of a series of experiments designed to measure the phase boundaries and the magnetization of the superfluid phases of (3)He are described. Measurements were performed at five pressures below the polycritical pressure of 21.5 bar. Magnetization data were obtained from continuous wave nuclear magnetic, resonance spectra by integrating the absorption signals. Phase boundaries were determined from the magnetization discontinuities induced by the phase transitions. The magnetization results were found to be in close agreement with the predictions of Bardeed-Cooper-Schrieffer theory suitably-corrected for Fermi liquid effects except at the lowest pressures (0 and 3 bar), where the data indicate a non linear magnetization vs. field relation. The data were reduced to yield the latent heat at the A - B transition, the molar volume difference in the two superfluid phases, and the zero field difference in the Gibbs potentials of the two phases. The Gibbs potential difference were extrapolated to the T approaches T sub c limit to extract the zero field difference in the specific heats of the A and B phases at T sub c. The specific heat results were compared with the predictions of weak coupling theory, and with two strong coupling theories.