XANES and magnetic studies of Ca1−xSrxRuO3 itinerant ferromagnetic system

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 e 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.