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

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

2004-03-30

arxiv.org/abs/cond-mat/0403742v1

Physics

Condensed Matter

Materials Science

15 pages, 4 figures, 1 table

Scientific paper

10.1016/j.ssc.2004.04.014

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 the same time, the Cu2+ antiferromagnetic state is destroyed and it's magnetic entropy suppressed by Ru on a 1:1 basis. This implies that each Ru transfers an electron to a Cu ion and thus the MIT correlates with filling the Cu 3d shell. The Cu spin entropy in this strongly correlated electron material provides a unique probe among MIT systems.

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