Abstract
X-ray absorption near-edge structure (XANES) and magnetic results on the itinerant ferromagnetic system Ca <sub>1-x</sub> Sr <sub>x</sub> RuO <sub>3</sub> (0≤x≤1) are reported, Ru L <sub>3</sub> -edge and O K-edge XANES as well as powder X-ray Rietveld analysis indicate stoichiometric 113 composition with tetravalent Ru <sup>4+</sup> and larger RuO <sub>6</sub> octahedral distortion near the exchange-enhanced paramagnetic metal CaRuO <sub>3</sub> region. Larger absorption intensity with increasing Sr substitution indicates larger density of states near the Fermi level ε <sub>F</sub> toward the itinerant ferromagnetic metal SrRuO <sub>3</sub> . Anomalous field-dependent behavior with small, unsaturated magnetic moment was observed in the ferromagnetic region (x>0.2). Ferromagnetic spin fluctuation was observed in the paramagnetic region (x≤0.2) from low temperature M(B <sub>a</sub> ) hysteresis studies. Time-dependent magnetic relaxation data M(t) show anomalous behavior. © 2004 Elsevier B.V. All rights reserved.