Three dimensional magnetism and coupling to conduction electrons in   PdCrO2
  We report density functional calculations addressing the electronic structure and magnetic properties of delafossite PdCrO2. We find substantial magnetic interactions in the c-axis direction as well as beyond first nearest neighbors in-plane, so that PdCrO2 is a 3D frustrated antiferromagnet. We also find substantial coupling between the Cr moments and the Pd derived conduction electrons. 
K. P. Ong and D. J. Singh
cond-mat.str-el