Valence-electron transfer and a metal-insulator transition in a strongly correlated perovskite oxide

A. P. Ramirez, G. Lawes, D. Li +1

We present transport and thermal data for the quadruple-perovskites MCu3(Ti1-xRux)4O12 where 0 < x < 1. A metal-insulator transition (MIT) occurs for Ru concentrations x~0.75. At t…