Abstract
An accurate study of the nuclear molar susceptibility χ of liquid He3 has been made. Particularly emphasized was the comparison of χ in the liquid with that in solid He3. The experimental results of this work define a three-dimensional surface χT/C versus temperatureT and molar volumeV between 0.35 and 2.2° K and between 26 and 37 cm3/mole. HereC is the molar Curie constant of solid He3, assumed to beN A µ2/k B T, where μ is the nuclear magnetic moment and N A Avogadro's number. The measurements were accomplished using a carefully designed pulsed NMR set, and sample-and-hold circuitry with a digital voltmeter for readout. Most of the measurements were made at fixed temperature relative to a sample of bcc solid He3, usually at a density of 22.50 cm3/mole. These data were complemented by measurement of χ versusT at fixed pressure. Except at the highest temperatures, the scatter in the values was about 0.3%, and the results are estimated to be accurate within ±0.5%. At sufficiently high temperatures, the susceptibility is found to tend asymptotically towards Curie's law by comparison with solid He3. The deviation from Curie's law, to temperatures near 0.5° K, could be empirically written as (1−χT/C)=bT dwhereb andd are density-dependent parameters. Comparison with theories and previous measurements of the nuclear susceptibility are made. Below 1° K, the present results are about midway between those of Beal and Hatton9 and those of Thomson, Meyer, and Adams.8
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References
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Research supported by a grant from the National Science Foundation and from the AROD. The results have been presented as an Abstract inBull. Am. Phys. Soc. 14, 601 (1969), submitted in partial fulfillment for the Ph.D. in physics by J. R. Thompson, May 1969.
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Thompson, J.R., Ramm, H., Jarvis, J.F. et al. Nuclear susceptibility of liquid He3—I. J Low Temp Phys 2, 521–537 (1970). https://doi.org/10.1007/BF00628272
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DOI: https://doi.org/10.1007/BF00628272