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The Particularities of Infinite‐Layer Compounds Sr 1–x Ln x CuO 2–δ (Ln=La, Pr, Nd, Eu)
Author(s) -
Luparev V.V.,
Kuz'micheva G.M.,
Khlybov E.P.,
Kostyleva I.E.,
Palewski T.
Publication year - 2001
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/1521-4079(200107)36:6<557::aid-crat557>3.0.co;2-b
Subject(s) - superconductivity , cuprate , rietveld refinement , materials science , condensed matter physics , powder diffraction , crystallography , crystal structure , chemistry , physics
The superconducting phases with general formula Sr 1–x Ln x CuO 2–δ with Ln=La (Tc=24…40K); Pr (Tc=30…44 K); Nd (Tc=8K…40 K); Eu (Tc…40 K) and non‐superconducting phases of CaCuO 2 – 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. With in 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 CaCuO 2 –type structure in samples with Ln=Nd and Eu was found.