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Structure and physical properties of K0.63RhO2 single crystals

Author(s): S. H. Yao | B. B. Zhang | J. Zhou | Y. B. Chen | S. T. Zhang | Z. B. Gu | S. T. Dong | Y. F. Chen

Journal: AIP Advances
ISSN 2158-3226

Volume: 2;
Issue: 4;
Start page: 042140;
Date: 2012;
Original page

K0.63RhO2 single crystals were successfully grown by the flux method. Rietveld refinement of power X-ray diffraction patterns suggests that K0.63RhO2 belongs to the monoclinic P63mmc space group. Transport measurements on K0.63RhO2 revealed metallic behavior. The temperature-dependent resistance is well fitted by a different power law in two different temperature ranges. Antiferromagnetic ordering is observed in the ab-plane of K0.63RhO2 below 50 K. The most attractive feature of K0.63RhO2 is its significant Seebeck coefficient at room temperature (46 μV/cm), which is much greater than that of normal metals. Considered all together, the metallic conductivity, the significant Seebeck effect, and the non-hygroscopic properties of K0.63RhO2 make it a promising candidate material for thermoelectric applications.
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