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

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date

1994

Department

Department of Neuroscience and Biomedical Engineering

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Language

en

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Physical Review B, Volume 50, issue 6, pp. 4154-4158

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.

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Keywords

Eu-151, Mössbauer spectroscopy, YBa2Cu4O8

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DOI

10.1103/PhysRevB.50.4154

Citation

Lindén, J, Lippmaa, M, Miettinen, J, Tittonen, I, Katila, T, Kareiva, A, Karppinen, M, Niinistö, L, Valo, J & Leskelä, M 1994, 'Europium Substitution Effects in Superconducting YBa2Cu4O8 Synthesized under one Atmosphere Oxygen Pressure', Physical Review B, vol. 50, no. 6, pp. 4154-4158. https://doi.org/10.1103/PhysRevB.50.4154

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https://urn.fi/URN:NBN:fi:aalto-202510087770

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[article-cris] Perustieteiden korkeakoulu / SCI