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On the magnetism of Ln2/3Cu3Ti4O12 (Ln = lanthanide)

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Abstract.

The magnetic and thermodynamic properties of the complete Ln2/3Cu3Ti4O12 series were investigated. Here Ln stands for the lanthanides La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb. All the samples investigated crystallize in the space group \(Im\bar{3}\) with lattice constants that follow the lanthanide contraction. The lattice constant of the Ce compound reveals the presence of Ce4+ leading to the composition Ce1/2Cu3Ti4O12. From magnetic susceptibility and electron-spin resonance experiments it can be concluded that the copper ions always carry a spin S = 1/2 and order antiferromagnetically close to 25 K. The Curie-Weiss temperatures can approximately be calculated assuming a two-sublattice model corresponding to the copper and lanthanide ions, respectively. It seems that the magnetic moments of the heavy rare earths are weakly coupled to the copper spins, while for the light lanthanides no such coupling was found. The 4f moments remain paramagnetic down to the lowest temperatures, with the exception of the Tm compound, which indicates enhanced Van-Vleck magnetism due to a non-magnetic singlet ground state of the crystal-field split 4f manifold. From specific-heat measurements we accurately determined the antiferromagnetic ordering temperature and obtained information on the crystal-field states of the rare-earth ions.

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Authors and Affiliations

  1. Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135, Augsburg, Germany

    A. Dittl, S. Krohns, J. Sebald, F. Schrettle, M. Hemmida, H.-A. Krug von Nidda, S. Riegg & A. Loidl

  2. Resource Strategy, University of Augsburg, 86135, Augsburg, Germany

    A. Reller

  3. Solid State Chemistry, Martin-Luther University Halle-Wittenberg, 06120, Halle, Germany

    S. G. Ebbinghaus

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  1. A. Dittl
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  2. S. Krohns
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  3. J. Sebald
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  4. F. Schrettle
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  5. M. Hemmida
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  6. H.-A. Krug von Nidda
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  7. S. Riegg
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  9. S. G. Ebbinghaus
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  10. A. Loidl
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Correspondence to S. Krohns.

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Dittl, A., Krohns, S., Sebald, J. et al. On the magnetism of Ln2/3Cu3Ti4O12 (Ln = lanthanide). Eur. Phys. J. B 79, 391–400 (2011). https://doi.org/10.1140/epjb/e2010-10796-1

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  • DOI: https://doi.org/10.1140/epjb/e2010-10796-1

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