Europium Substitution Effects in Superconducting YBa2Cu4O8 Synthesized under one Atmosphere Oxygen Pressure

J. Lindén, Mikk Lippmaa, J. Miettinen, Ilkka Tittonen, T. Katila, A. Kareiva, M. Karppinen, L. Niinistö, Jaana Valo, M. Leskelä

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Abstract

Y1−xEuxBa2Cu4O8 powder samples, with x=0, 0.25, 0.5, 0.75, and 1.0, were synthesized at ambient pressure using either an acetate-tartrate sol-gel method or a LiF flux process. The lattice parameters and purity of the samples were checked using X-ray diffraction. The superconducting transition was monitored by magnetic-susceptibility measurements. Replacing yttrium with europium increased the unit-cell volume, decreased the orthorhombicity (b/a) and the critical temperature. The hyperfine interactions at the europium site were studied by 151Eu Mössbauer spectroscopy. The complete quadrupole Hamiltonian of the 21.5-keV γ transition of 151Eu was successfully applied in the analyses of the Mössbauer spectra. The Mössbauer parameters obtained were found to resemble those measured for the EuBa2Cu3Cu3O7−δ (1:2:3) system. It was demonstrated that magnetic alignment of the crystallites could not be obtained with an 11.7-T field, contrary to the 1:2:3 and other high-Tc systems. The magnetic susceptibility for 1:2:4 single crystals appears to be isotropic.
Original languageEnglish
Pages (from-to)4154-4158
JournalPhysical Review B
Volume50
Issue number6
DOIs
Publication statusPublished - 1994
MoE publication typeA1 Journal article-refereed

Keywords

  • Eu-151
  • Mössbauer spectroscopy
  • YBa2Cu4O8

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