Abstract
The magnetic and transport properties of a new cubic KSbO 3-type ruthenate, (Ba 1− x Sr x ) 2Ru 3O 9 ( x≈0.35), have been investigated. The crystal structure has a singular geometry in which ruthenium atoms form an ideal three-dimensional orthogonal dimer lattice. The magnetic susceptibility is Pauli-paramagnetic but exhibits an anomalous temperature dependence reminiscent of a gap-like behavior. The resistivity exhibits a metallic behavior, except for a rise at low temperature.
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