Magnetism in (Ca,Sr)2RuO4 observed by 119Sn-Mössbauer spectroscopy

Abstract We report on the magnetic behavior observed by 119Sn-Mossbauer spectroscopy in Ca2−xSrxRuO4 samples (x=0.09, 0.2, and 2.0). The 119Sn-Mossbauer probe substitutes Ru4+ at the RuO2-layers as Sn4+. Mossbauer spectra at 4.2 K show the presence of magnetic correlations due to transferred hyperfine field (Bhf) at the Sn(Ru)-sites for two samples (x=0.09 and 0.20), while it was not observed for Sr2RuO4 (x=2.0). The Bhf softly decreases with x going from 0.09 to 0.2, indicating remaining short-range antiferromagnetic correlations at x=0.2 concentration, where a first structural transition has been reported. In both samples, the transferred Bhf shows a canted magnetic structure.