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Spin-dimerization in rare-earth substituted La 2 RuO 5

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Listed:
  • S. Riegg
  • A. Günther
  • H.-A. Krug von Nidda
  • M.V. Eremin
  • A. Reller
  • A. Loidl
  • S.G. Ebbinghaus

Abstract

The Ru-Ru spin-singlet formation in La 2 − x L n x RuO 5 (Ln=Pr, Nd, Sm, Gd, Dy) was investigated by measurements of the specific heat and magnetic susceptibility. After subtraction of the lattice contribution from the specific heat (C p ), similar excess entropy values were obtained for all compounds. These entropies can be explained by the formation of antiferromagnetic Ru-spin dimers at low temperatures and provide a lower estimate for the intradimer exchange strength. Pronounced changes in the transition temperatures and a broadening of the corresponding peak in C p were observed. These changes depend on the rare-earth element and are due to local structural changes and heterogeneities caused by the substitution. The magnetic susceptibilities can be described by the sum of a rare-earth paramagnetic moment and the susceptibility of the unsubstituted La 2 RuO 5 . Density functional theory (DFT) calculations were performed for various compounds to investigate the origin of the magnetic transition and the relationship between structural changes and the spin-dimerization temperature. The combination of the present results with previous structural investigations supports the model of a spin-pairing of the Ru moments which occurs as a reason of the structural phase transition in La 2 − x L n x RuO 5 . Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2012

Suggested Citation

  • S. Riegg & A. Günther & H.-A. Krug von Nidda & M.V. Eremin & A. Reller & A. Loidl & S.G. Ebbinghaus, 2012. "Spin-dimerization in rare-earth substituted La 2 RuO 5," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 85(12), pages 1-10, December.
    • Handle: RePEc:spr:eurphb:v:85:y:2012:i:12:p:1-10:10.1140/epjb/e2012-30840-4
    DOI: 10.1140/epjb/e2012-30840-4
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    Solid State and Materials;

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