Anomalous electric conductions in KSbO3-type metallic rhenium oxides

Details Anomalous electric conductions in KSbO3-type metallic rhenium oxides Anomalous electric conductions in KSbO3-type metallic rhenium oxides

2007-02-20

arxiv.org/abs/cond-mat/0702451v1

Physics

Condensed Matter

Materials Science

13 pages, 7 figures. J. Phys. Soc. Japan, in press

Scientific paper

10.1143/JPSJ.76.044805

Single crystals of KSbO3-type rhenium oxides, La4Re6O$19, Pb6Re6O19, Sr2Re3O9 and Bi3Re3O11, were synthesized by a hydrothermal method. Their crystal structures can be regarded as a network of three-dimensional orthogonal-dimer lattice of edge-shared ReO6 octahedra. All of them exhibit small magnitude of Pauli paramagnetism, indicating metallic electronic states without strong electron correlations. The resistivity of these rhenates, except Bi3Re3O11, have a temperature dependence of $rho(T)=\rho_{0}+AT^{n}$ $(n \approx 1.6)$ in a wide temperature range between 5 K and 300 K, which is extraordinary for three-dimensional metals without strong electron correlations. The resistivity of Bi3Re3O11 shows an anomaly around at 50 K, where the magnetic susceptibility also detects a deviation from ordinary Pauli paramagnetism.

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