Abstract
X-ray absorption near-edge structure (XANES) and magnetic results on the itinerant ferromagnetic system Ca 1− x Sr x RuO 3 (0⩽ x⩽1) are reported. Ru L 3 -edge and O K-edge XANES as well as powder X-ray Rietveld analysis indicate stoichiometric 113 composition with tetravalent Ru 4+ and larger RuO 6 octahedral distortion near the exchange-enhanced paramagnetic metal CaRuO 3 region. Larger absorption intensity with increasing Sr substitution indicates larger density of states near the Fermi level ε F toward the itinerant ferromagnetic metal SrRuO 3. 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 a) hysteresis studies. Time-dependent magnetic relaxation data M( t) show anomalous behavior.
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