Valence degeneracy in CaCu3Cr4O12 Original Research Article

The synthesis of CaCu3Cr4O12 has been accomplished at a pressure of 60 kbar. Analysis of single crystal X-ray diffraction data demonstrates that this compound is isostructural with CaCu3Ti4O12. The electrical resistivity data for CaCu3Cr4O12 show metallic behavior, and the magnetic susceptibility indicates delocalized electrons for both Cr and Cu. The Cu–O and Cr–O bond distances give fractional valences of Cu2.45 and Cr3.66, thus indicating both Cu and Cr 3d states at the Fermi level.