Soft x-ray magnetic circular dichroism study of Ca_(1-x)Sr_xRuO_3 across the ferromagnetic quantum phase transition

摘要

Ca_(1-x)Sr_xRuO_3, which is ferromagnetic for Sr concentration x > 0.3, has been studied by x-ray magnetic circular dichroism (XMCD) in Ru 3p and O 1 s core-level x-ray absorption. XMCD signals appear at x ～ 0.3 and monotonically increase with x in the ferromagnetic phase. While the monotonic increase of the XMCD signals with x is of a typical Stoner-type, the absence of appreciable change in the spectral line shapes of both the Ru 3p and O 1s XMCD spectra indicate that the itinerant-electron ferromagnetism in Ca_(1-x)Sr_xRuO_3 is influenced by strong electron correlation.