We have investigated electrical and magnetic properties of A2Cu3O4X2 (A = alkaline-earth; X = halogen) with the Cu3O4 plane, which is composed of Cu(1)O2 and extra Cu(2) sublattices. The electrical resistivity exhibits semiconductive behavior. The magnetic susceptibility shows three-dimensional antiferromagnetic order below TN(1) and TN(2) for the Cu(1)O2 and Cu(2) sublattices, respectively. A broad peak due to the two-dimensional antiferromagnetic order in the Cu(2) sublattice is also observed around TN2D(2). With increasing ionic-radii of A and X, the lattice parameters increase, the electrical resistivity increases and values of TN(1) and TN2D(2) decrease. These results are explained as being due to the decrease of the overlap between the Cu 3d orbit and the O 2p, X p ones.
- CuO plane
- Electrical resistivity
- Magnetic susceptibility
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering