Heat capacity and phase-boundary-line data on liquid3He in the few millikelvin temperature range obtained by Wheatley and his co-workers are analyzed within the framework of thermodynamics. The data favor the thermally anomalous disordered high temperature liquid phase to become of normal thermal behavior in its ordered B phase. The latter exhibits entropy decrease on isothermal compression, or its isobaric volume expansion coefficient is positive. At temperatures substantially below the phase-boundary temperatures, the ordered liquid might revert smoothly into a modification of anomalous thermal behavior, i.e., with entropy increase on isothermal compression. This alternation in the thermal behavior of the B phase, on experimental confirmation, could become helpful for a determination of the nature of its dominant thermal excitations in the indicated two temperature ranges, a situation reminiscent of the one existing in liquid4He II. Currently available magnetic susceptibility data raise the possibility, at very low temperatures, of further cooling liquid3He-B on adiabatic magnetization.
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Work performed under the auspices of the U.S. Atomic Energy Commission.
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Goldstein, L. Very low temperature properties of liquid helium-3. J Low Temp Phys 21, 321–345 (1975). https://doi.org/10.1007/BF01141330
- Heat Capacity
- Magnetic Susceptibility
- Thermal Behavior
- Isothermal Compression