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arXiv · 1110.3829

Magnetotransport properties of BaRuO$_3$: Observation of two scattering rates

Y. A. Ying·Y. Liu·T. He·R. J. Cava
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Abstract

We report results of low-temperature magnetotransport and Hall measurements on single crystals of four-layered hexagonal (4H) and nine-layered rhombohedral (9R) BaRuO$_3$ that provide insight into the structure-property relationships of BaRuO$_3$ polymorphs. We found that 4H BaRuO$_3$ possesses Fermi-liquid behavior down to the lowest temperature ($T$) of our measurements, 1.8 K. On the other hand, 9R BaRuO$_3$ was found to show a crossover in the temperature dependence of resistivity around 150 K, and the existence of two separate scattering rates at low temperatures. The magnetoresistance in the 9R BaRuO$_3$ was found to be negative while that in the 4H BaRuO$_3$ is positive. We propose that local moments may be present in 9R but not in 4H BaRuO$_3$, which leads to distinctly different behavior in the two forms.

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Y. A. Ying, Y. Liu, T. He, R. J. Cava. 2011-10-17. Magnetotransport properties of BaRuO$_3$: Observation of two scattering rates. https://doi.org/10.1103/physrevb.84.233104

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