Metallic behavior in A-site-ordered perovskites ACu(3)V(4)O(12) with A = Na+, Ca2+, and Y3+

摘要

The A-site-ordered perovskites ACu(3)V(4)O(12) (A = Na+, Ca2+, and Y3+) have been found to be Pauli paramagnetic metals. Bond valence sum calculations, magnetic susceptibility measurement, and electronic structure calculations reveal that both Cu and V orbitals contribute to the metallic conduction. Changing the A-site ions in ACu(3)V(4)O(12) from monovalent to divalent to trivalent ions changes the physical properties in ways that in a rigid band picture can be attributed to the shift of the Fermi energy. The ACu(3)V(4)O(12) compounds, unlike the isostructural metallic CaCu3Ru4O12, show no conclusive evidence of heavy-fermion-like behavior.