We report precision measurements of the dielectric constant ε of liquid and solid4He at constant density as a function of temperature in the range0.1<T<1.2 K. For these measurements a capacitance bridge was used, the stability of which permitted a reproducibility of δε / ε ≈ 6×10−9 in the dielectric constant. We find that the polarizabilityp, defined by the Clausius-Mosotti equation, is a weak function of temperature. This dependence onT at the low-temperature end diminishes as the density of4He is decreased to that at saturated vapor pressure. We also describe briefly attempts at measuring the change of ε at the superfluid transition in4He and during the melting process, all corrected to conditions of constant volume, and upper limits for these changes are given. Finally, we present measurements of ε in liquid4He at saturated vapor pressure between 0.15 and 1.3 K, from which we deduce the change in density. The results are compared with recent data obtained with a microwave cavity method and good agreement is found. Further comparisons are made with Van Degrift's results at 4 MHz and also with other recent data above 0.7 K.
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Research supported by a grant from the National Science Foundation.
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Chan, M., Ryschkewitsch, M. & Meyer, H. The dielectric constant in liquid and solid4He. J Low Temp Phys 26, 211–228 (1977). https://doi.org/10.1007/BF00654569
- Dielectric Constant
- Vapor Pressure
- Magnetic Material
- Constant Volume