Properties and structures of R2-xAxCuO4 phases: R = La, Pr and Nd; A = Sr, Pb and Cd

Gopalakrishnan, J. ; Subramanian, M. A. ; Torardi, C. C. ; Attfield, J. P. ; Sleight, A. W. (1989) Properties and structures of R2-xAxCuO4 phases: R = La, Pr and Nd; A = Sr, Pb and Cd Materials Research Bulletin, 24 (3). pp. 321-330. ISSN 0025-5408

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The R2CuO4 phases for R = Pr and Nd were prepared and found to be semiconducting as previously reported. Crystal structures of both compounds were examined by profile refinements of neutron powder diffraction data. A series of phases of the type R2-xSrxCuO4 which are isostructural with R2CuO4 for x up to 0.1 were prepared and found to remain semiconducting. Chemical analysis indicates the presence of CuIII, yet these materials are not superconducting. This supports the view that R2CuO4 phases should be regarded as Mott insulators. A new series of phases possessing the tetragonal K2NiF4 structure appear in the Pr2-xSrxCuO4 system for 1.0≤x ≤ 1.25. The new phases are semiconducting. We also find semiconductivity and not superconductivity for La2-xAxCuO4 where A is Pb or Cd. Reasons are discussed for why Ba, Sr, Ca and Na substitutions into La2CuO4 lead to superconductivity whereas the Pb and Cd substitutions do not.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Copper; Lead; Cadmium; Lanthanum; Strontium; Praseodymium; Oxides
ID Code:12532
Deposited On:13 Nov 2010 13:24
Last Modified:03 Jun 2011 05:01

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