The semiconducting, green Y2BaCuO5 compound, which is structurally related to the 90K superconductor YBa2Cu3O7-δ, was found to behave like a S= 1 2 Heisenberg quadratic-layer antiferromagnet with an exchange constant of 2J=33.3 ± 0.5 K. There is a peak in the susceptibility at 30 ± 0.5 K, above which it exhibits Curie-Weiss behavior with the Weiss constant estimated at +55.4 K. The local symmetry around the copper (II) ions was found to be rhombic. The orbital reduction factor for Cu2+ in this compound was estimated to be k=0.52, indicating appreciable covalency in the Cu-O bonds.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Materials Chemistry