Thermal expansion and magnetostriction of a nearly saturated 3He-4He mixture

• Published in: Philosophical magazine (Abingdon, England) Vol. 89; no. 22-24; pp. 2071 - 2078
• Main Authors: Schmiedeshoff, G.M., Lounsbury, A.W., Tozer, S.W., Palm, E.C., Hannahs, S.T., Murphy, T.P., Park, J.-H., Opeil, C.P., Bedell, K.S.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Abingdon Taylor & Francis Group 01.08.2009; Taylor & Francis
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Electron states; Exact sciences and technology; Fermi liquid; helium 3-4 mixtures; Magnetic properties and materials; Magnetomechanical and magnetoelectric effects, magnetostriction; magnetostriction; molar volume; Physics; Theories and models of many electron systems; thermal expansion; Thermal expansion; thermomechanical effects and density; Thermal properties of condensed matter; Thermal properties of crystalline solids; Thermal expansion; Temperature dependence; Magnetostriction; Molar volume; Thermal expansion coefficient; Magnetic field effects; Helium 3-4 mixtures; Fermi liquid
• ISSN: 1478-6435; 1478-6443
• DOI: 10.1080/14786430903019057

We have measured the molar volume of a nearly saturated 3 He- 4 He mixture, at temperatures below 100 mK and in magnetic fields to 16 T, by immersing capacitive dilatometers in the dilute phase of a top-loading dilution refrigerator. In zero magnetic field the coefficient of volume thermal expansion is negative and shows the linear temperature dependence expected of a Fermi liquid. Subject to experimental assumptions, we find the fractional increase in molar volume with magnetic field at 20 mK and 16 T to be about 0.01%.