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Nonlinear magnetic response in ruthenocuprates

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  • I. Živković
  • V. P.S. Awana
  • H. Berger

Abstract

We 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 2 O 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 x Cu 2 O 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

Suggested Citation

  • I. Živković & V. P.S. Awana & H. Berger, 2008. "Nonlinear magnetic response in ruthenocuprates," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 62(4), pages 423-431, April.
    • Handle: RePEc:spr:eurphb:v:62:y:2008:i:4:p:423-431
    DOI: 10.1140/epjb/e2008-00188-7
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