Abstract
The long-range ferromagnetic order was observed only for x⩾0.25 in the Ca1−xSrxRuO3 (0⩽x⩽1) metallic system, while short-range magnetic correlation of ferromagnetic double-exchange interaction persists for x<0.25. Temperature, field, and time dependent magnetization m(T,Ba,t) for exchange-enhanced paramagnetic Ca0.8Sr0.2RuO3 near the boundary show similar electronic-inhomogeneous, spin-glass-like behavior as in Sr-free CaRuO3. X-ray Rietveld analysis and x-ray absorption near-edge structure data indicate that weaker double-exchange coupling strength Jde in the Ca-rich regime is closely related with stronger RuO6 tilting and distortion, which results with weaker Ru 4d–O 2p hybridization, narrower bandwidth W, and stronger on-site Coulomb repulsion Udd.
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