Faraday Effect in Cerium Phosphate Glasses at Low Temperatures

The Faraday effect in glass specimens containing cerium metaphosphate in various concentrations has been measured at 4.2^∘{}K and 1.8^∘{}K, using 5461 A light, in magnetic fields ranging to 70 kilogauss. The curves of rotation vs H/T were fitted to the Brillouin function for J=1/2, yielding values of $g=1.75$ and β=0.874 Bohr magneton. The observed rotations were quite large; for the glass containing the highest concentration of cerium, the rotation approached a saturation value of 4.76π radians/mm.