The Magnetic Properties of Some Rare Earth Oxides at Low Temperatures

Abstract

The magnetic properties of several rare earth oxides have been studied at temperatures varying from room temperature to - 150\ifmmode^\circ\else\textdegree\fi{} C. and the results compared with values previously obtained at higher temperatures.It is found that, while good agreement is obtained at room temperature where the two measurements overlap, the value of $\ensuremath{\theta}$ in the expression $X(T+\ensuremath{\theta})=\mathrm{const}.$, is smaller for low temperatures than for high temperatures, thus indicating that Curie's law is followed more closely at low temperature than at high temperature for the oxides investigated. This is opposite to what H. K. Onnes and A. Pirrier found for oxygen.