New La2CuO4 derivatives La2-2xSr2xCu1-xMxO4(M=Ti,Mn,Fe,or Ru): a study of linear Cu-O-M electronic interaction in two dimensions

Ramesha, K. ; Uma, S. ; Vasanthacharya, N. Y. ; Gopalakrishnan, J. (1997) New La2CuO4 derivatives La2-2xSr2xCu1-xMxO4(M=Ti,Mn,Fe,or Ru): a study of linear Cu-O-M electronic interaction in two dimensions Journal of Solid State Chemistry, 128 (2). pp. 169-175. ISSN 0022-4596

Full text not available from this repository.

Official URL: http://linkinghub.elsevier.com/retrieve/pii/S00224...

Related URL: http://dx.doi.org/10.1006/jssc.1996.7160

Abstract

Oxides of the general formula La2-2xSr2xCuII1-xMIVx O4(M=Ti, Mn, Fe, or Ru), crystallizing in the tetragonal K2NiF4structure, have been synthesized. For M=Ti, only the x=0.5 member could be prepared, while for M=Mn and Fe, the composition range is 0<x<1.0, and for M=Ru, the composition range is 0<x≤0.5. There is no evidence for an ordering of Cu(II) and M(IV) in the x=0.5 members. While the members of the M=Ti, Mn, and Ru series are semiconducting/insulating, the members of the M=Fe series are metallic, showing a broad metal-semiconductor transition around 100 K for 0<x≤0.15 that is possibly related to a Cu(II)-O-Fe(IV)↔Cu(III)O-Fe(III) valence degeneracy. Increasing the strontium content at the expense of lanthanum in La2-2xSr2xCu1-xFexO4 for x≤0.20 renders the samples metallic but not superconducting.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:12724
Deposited On:11 Nov 2010 09:04
Last Modified:02 Jun 2011 11:35

Repository Staff Only: item control page