Spin-Glass Insulator State in (Tb-La${)}_{2/3}$C${\mathrm{a}}_{1/3}$Mn${\mathrm{O}}_3$ Perovskite

A thorough study of the low-temperature magnetic state of polycrystalline $({\mathrm{Tb}}_{1/3}{\mathrm{La}}_{2/3}{)}_{2/3}{\mathrm{Ca}}_{1/3}{\mathrm{MnO}}_3$ has been carried out. This perovskitelike compound is an insulator at low temperatures and shows an insulator-metal transition under magnetic field. All the measurements of its magnetic state (magnetization, susceptibility, and neutron diffraction) are consistent with spin-glass behavior. The magnetic and electronic phase diagram for the series $({\mathrm{Tb}}_x{\mathrm{La}}_{1-x}{)}_{2/3}{\mathrm{Ca}}_{1/3}{\mathrm{MnO}}_3$ is depicted.