Magnetization and susceptibility studies of the superconductive compound ${\mathrm{Gd}}_1$${\mathrm{Ba}}_2$${\mathrm{Cu}}_3$${\mathrm{O}}_{\mathrm{z}}$

The magnetic susceptibility and magnetization of the superconductive compound ${\mathrm{Gd}}_1$ ${\mathrm{Ba}}_2$ ${\mathrm{Cu}}_3$ ${\mathrm{O}}_{\mathrm{z}}$ has been studied in the temperature range from 1.5 to 270 K. The magnetic susceptibility χ of the material, which has a superconductive transition temperature $T_c$ near 95 K, follows a Curie-Weiss law both above and below $T_c$ with the full Gd magnetic moment, $p_{\mathrm{eff}=7.84\mathrm{}{\mu }_B}$, being observed. The independence of the superconductive and magnetic behavior indicates that superconductivity in this system is highly anisotropic. This conclusion is supported by magnetization measurements below $T_c$, which also yield an antiferromagnetic, Curie-Weiss-like temperature ${\mathrm{FTHETA}}_M$ of +2.3 K.