Spin-glass like behaviors in La1−x Tb x MnO3 perovskite
A series of samples of La1−x Tb x MnO3 (0⩽x⩽0.15) are prepared. The static and dynamic magnetizations of La1−x Tb x MnO3 have been investigated. The results indicate that the spins with the short-range order are frozen into random direction at low enough temperatures which leads to the samples exhibiting the spin-glass like behavior. It is considered that the spin-glass like behavior originates from the competition between ferromagnetic double exchange among Mn3+ and Mn2+ and antiferromagnetic superexchange among Mn3+ and Mn3+, as well as Tb3+ and Tb3+.