Nonlinear magnetic response in ruthenocuprates

I. Živković (), V. P.S. Awana and H. Berger

The European Physical Journal B: Condensed Matter and Complex Systems, 2008, vol. 62, issue 4, 423-431

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

Keywords: 75.20.-g Diamagnetism, paramagnetism, and superparamagnetism, 75.30.Cr Saturation moments and magnetic susceptibilities, 75.40.Gb Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.), 64.75.+g Solubility, segregation, and mixing; phase separation, (search for similar items in EconPapers)
Date: 2008
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DOI: 10.1140/epjb/e2008-00188-7

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