Magnetic Thermometry with Cerium Magnesium Nitrate and Its Relation to the Properties ofHe3

Abstract

Direct comparison of the magnetic temperature of one cerium-magnesium-nitrate powder thermoeter with that of a single-crystal sphere shows that the former is less than the latter by $\Delta =+(0.46\mathrm{}\pm 0.05)$ mdeg K. Comparison of other powdered thermometers suggests that $\Delta$ may vary from thermometer to thermometer by 0.1 to 0.2 mdeg K. These values of $\Delta$ do not lead to serious difficulties when comparing experimental properties of ${\mathrm{He}}^3$ with theories of the Fermi liquid.