Fig. 3.

Phase diagram of the magnetic transition temperatures versus the tabulated average A-site ionic radius 〈r_A〉 for Sr_1−yBa_yRuO₃ and Sr_1−xCa_xRuO₃. Three members in the phase diagram CaRuO₃, SrRuO₃, and BaRuO₃, in which the A-site size variance is zero, are distinguished by the solid symbols. The shaded area in the phase diagram represents the phase having the characteristic χ⁻¹(T) of the Griffiths' phase. Letters inside the diagram stand for the crystal structure as determined by x-ray diffraction at room temperature, O for orthorhombic, T for tetragonal, and C for cubic. (Inset) Temperature dependence of inverse magnetic susceptibility of Sr_1−xCa_xRuO₃ measured with a magnetic field H = 1 T (data are from ref. 28) and of Sr_1−yBa_yRuO₃ measured with a magnetic field H = 0.5 T in this work.