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The European Physical Journal B

, Volume 62, Issue 4, pp 423–431 | Cite as

Nonlinear magnetic response in ruthenocuprates

  • I. ŽivkovićEmail author
  • V. P.S. Awana
  • H. Berger
Solids and Liquids

Abstract.

We have performed an investigation of the nonlinear magnetic response in ruthenocuprates. A negative, diverging-like peak at the main magnetic transition TN in RuSr2 RECu2O8 (RE = Gd, Y) indicates a possible canted antiferromagnetic order. Another well defined feature above TN points to a blocking of superparamagnetic particles through the T-3 dependence of the third harmonic at higher temperatures. Below TN a nondiverging peak appears, which is strongly affected by the addition of 10% of Cu ions in the RuO2 planes. In RuSr2 RE 2-xCexCu2O10 the main magnetic transition TM 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.

PACS.

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 

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Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2008

Authors and Affiliations

  1. 1.Institute of PhysicsZagrebCroatia
  2. 2.LQM, IPMC, EPFLLausanneSwitzerland
  3. 3.National Physical LaboratoryNew DelhiIndia
  4. 4.LPRX, IPMC, EPFLLausanneSwitzerland

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