Abstract
Density functional theory is used to study the structural, electronic, and magnetic properties of BaCoO2. Structural relaxation for different collinear magnetic configurations points to a remarkable magneto-elastic coupling in BaCoO2. Although we obtain several stable long range ordered magnetic structures, ferromagnetism is energetically favorable in the case of the LSDA method. In contrast, for the LSDA + U method antiferromagnetic ordering is found to be favorable. (C) 2011 Elsevier B.V. All rights reserved.