Nonlinear magnetic response in ruthenocuprates
AbstractWe have performed an investigation of the nonlinear magnetic response in ruthenocuprates. A negative, diverging-like peak at the main magnetic transition T N in RuSr 2 RECu 2O 8 (RE=Gd, Y) indicates a possible canted antiferromagnetic order. Another well defined feature above T N points to a blocking of superparamagnetic particles through the T -3 dependence of the third harmonic at higher temperatures. Below T N a nondiverging peak appears, which is strongly affected by the addition of 10% of Cu ions in the RuO 2 planes. In RuSr 2 RE 2-x Ce xCu 2O 10 the main magnetic transition T M is accompanied by two characteristic temperatures in the third harmonic of the ac susceptibility, in agreement with recent studies from μSR and Mössbauer spectroscopy. We find that the spin-spin correlation temperature is the same in both families of ruthenocuprates. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2008
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Bibliographic InfoArticle provided by Springer in its journal The European Physical Journal B.
Volume (Year): 62 (2008)
Issue (Month): 4 (04)
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Web page: http://www.springer.com/economics/journal/10051
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