Abstract
We describe an exploratory investigation of the structure and electronic properties of new ruthenium(IV) pyrochlore oxides and their manganese-substituted derivatives. Our investigations have revealed several, hitherto unreported, electronic ground states for these materials: a metallic and Pauli paramagnetic state for BiPbRu 2O 6.5 that turns into a semiconducting ferromagnetic spin-glass state at 50 K for BiPbRuMnO 6.5; a metallic state that likely shows a charge density wave (CDW) instability at 50–225 K for Bi 1.50Zn 0.50Ru 2O 6.75 that is suppressed by manganese substitution in Bi 1.50Zn 0.50Ru 1.75Mn 0.25O 6.50; and a metallic ferromagnetic spin-glass like state for Pb 2Ru 1.75Mn 0.25O 6.15. The results indeed affirm the richness of the electronic properties of ruthenium-based metal oxides.
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