The magnetic properties of the mixed valence Eu oxide EuTi1-x Sc x O3 (0≤x≤1)

We have investigated the magnetic properties of EuTi_1-xSc_xO₃ (ETSO) with $x=0$ - 1. Substitution of Ti⁴⁺ with Sc³⁺ oxidizes magnetic Eu²⁺ ($J=7/2$) into nonmagnetic Eu³⁺ ($J=0$), and the resultant mixed valence of Eu²⁺/Eu³⁺ induces the ferromagnetic (FM) transition just like the case of EuTi_1-xAl_xO₃ (ETAO). The FM correlation is most enhanced at $x=0.2$. With increasing x from 0.2, the Curie temperature $T_{\text{C}}$ is decreasing probably due to orthorhombic distortion and/or the decrease in Eu²⁺. The magnetic phase diagram for ETSO is similar to that for ETAO, but the $T_{\text{C}}$ is lower than that of ETAO at the same x. This is explained by the increase of the distance between Eu ions and/or the strong quenched disorder resulting from Sc³⁺ substitution.