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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