Abstract
We report on the magnetic behavior observed by 119Sn-Mössbauer spectroscopy in Ca 2− x Sr x RuO 4 samples ( x=0.09, 0.2, and 2.0). The 119Sn-Mössbauer probe substitutes Ru 4+ at the RuO 2-layers as Sn 4+. Mössbauer spectra at 4.2 K show the presence of magnetic correlations due to transferred hyperfine field ( B hf) at the Sn(Ru)-sites for two samples ( x=0.09 and 0.20), while it was not observed for Sr 2RuO 4 ( x=2.0). The B hf 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 B hf shows a canted magnetic structure.
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