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

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.

arXiv comment4 pages, 3 figures, accepted for publication in Physical Review B as a brief report

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Cited by in corpus (6)

• Hexagonal Perovskites as Quantum Materials
• Complex magnetic structure in Ba5Ru3O12 with isolated Ru3O12-trimer
• Atomic structure of initial nucleation layer in hexagonal perovskite BaRuO${}_3$ thin films
• Realization of a "Two Relaxation Rates" in the Hubbard-Falicov-Kimball Model
• Disorder versus two transport lifetimes in a strongly correlated electron liquid
• Effects of Magnetovolume and Spin-orbit Coupling in the Ferromagnetic Cubic Perovskite BaRuO3