Effect of Pressure on the Curie Temperature of Zr${\mathrm{Zn}}_2$

The initial pressure derivative of the Curie temperature of Zr${\mathrm{Zn}}_2$ has been measured under hydrostatic conditions, yielding a value of - (1.95±0.1)°K ${\mathrm{kbar}}^{-1\mathrm{}}$ for a sample with a Curie temperature of (21.5±0.5)°K. This is in good agreement with the values of -1.8 and -2.4°K ${\mathrm{kbar}}^{-1\mathrm{}}$ predicted by Wohlfarth using the model of a very weak itinerant ferromagnet and two different methods of calculation. The present measurement allows an estimate of the effective degeneracy temperature for Zr${\mathrm{Zn}}_2$ of 300°K and an estimate for the initial differential susceptibility of 6.2×${10}^{-5\mathrm{}}$ emu ${\mathrm{g}}^{-1\mathrm{}}$ ${\mathrm{Oe}}^{-1\mathrm{}}$.