Crystal Research and Technology
Cryst. Res. Technol. 36 (2001) 557 - Abstract -

V. V. Luparev1, G. M. Kuzmicheva1, E. P. Khlybov2,3, I. E. Kostyleva2,3, T. Palewski2

1) Department of Solid State Physics and Chemistry, M. V. Lomonosov State Academy of Fine Chemical Technology, Moscow, Russia
2) International Laboratory of High Magnetic Fields and Low Temperatures, Wroclaw, Poland
3) L. F. Vereshchagin Institute for High Pressure Physics, Troitsk, Russia

The Particularities of Infinite-Layer Compounds Sr1-xLnxCuO2-d (Ln = La, Pr, Nd, Eu)

The superconducting phases with general formula Sr1-xLnxCuO2-dwith Ln = La (Tc= 24...40K); Pr (Tc =30...44 K); Nd (Tc =8K...40 K); Eu (Tc =40 K) and non-superconducting phases of CaCuO2-type structure were prepared by high-pressure synthesis. The products were examined by X-ray powder diffraction. For the determination of composition Rietveld method was used. Structure investigations have shown that non-superconducting phases have oxygen vacancies. Within the Cu formal charge range from 1.81 to 1.93 the infinite layer cuprates exhibit superconductivity. Coexistence of both superconducting and non-superconducting phases of the CaCuO2-type structure in samples with Ln = Nd and Eu was found.

Keywords: layer cuprates; oxygen vacancies; phase splitting; superconductivity


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