Relation between T
c and the defect structure of neodymium cerium cuprite Nd2?x
CexCuO4?y |
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Authors: | V I Voronin A E Kar’kin B N Roshchitskii A Yu Zuev T P Rodionova A N Petrov |
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Institution: | (1) Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, 620219 Ekaterinburg, Russia;(2) Urals State University, 620083 Ekaterinburg, Russia |
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Abstract: | Neutron powder diffraction has been used to study the defect structure of neodymium cerium cuprite Nd2−x
CexCuO4±y
(x=0.15). It has been shown that in addition to oxygen vacancies, O2 sites in superconducting samples may also contain a small
quantity of implanted oxygen atoms positioned between copper ions and neodymium/cerium, which control the electrical charge
in the Cu-O planes. The oxygen distribution among crystal lattice sites in Nd2−x
CexCuO4±y
(x=0.15) as determined, the average charge of the copper ions was calculated by the method of valence sums, and a correlation
was established between the charge of the copper-oxygen plane and T
c.
Fiz. Tverd. Tela (St. Petersburg) 40, 177–183 (February 1998) |
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Keywords: | |
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