Magnetic Properties of ZrZn2between 120°K and 0.1°K. Search for Superconductivity

The incremental magnetic susceptibilities of two samples of a zinc-zirconium alloy have been measured as a function of the temperature from 120°K down to 0.1°K. These data indicate a Curie point of 32°K for a powder sample and 24°K for a solid sample. The magnetic moments of these samples were studied as a function of magnetic field at 77, 4.2, 1.2, and 1.0°K. These data indicate that the ferromagnetic compound Zr${\mathrm{Zn}}_2$ has a magnetic moment of 0.10${\mu }_B$ per molecule. Neither the susceptibility measurements nor the direct electrical-resistivity measurements give any indication of superconductivity in Zr${\mathrm{Zn}}_2$ at temperatures above 0.1°K.