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Influence of p- and n-type doping on the transport properties of the Nowotny chimney-ladder compounds RuAl2 and RuGa2

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Abstract

Nowotny chimney-ladder compounds RuAl2 and RuGa2 have been substituted with p- and n-type dopants to study the resistivity, Seebeck and Hall coefficients, and thermal conductivity of resulting compounds in the temperature range of 80–300 K. The resistivity and Seebeck coefficient suggest that these compounds are degenerate semiconductors. Hall measurements reveal that the carrier concentration has indeed been changed by an order of magnitude, particularly in p-type RuGa2 by substituting Cr and Mn. Compared to p-type samples, the resistivity is an order of magnitude larger for n-type samples, for a similar level of carrier concentration. Interestingly, the hole mobility is two to three orders of magnitude larger, reaching the highest value of ∼750 cm2/V·s. The electron mobility is temperature independent and is typically in the range of ∼1–4 cm2/V·s. Thermal conductivity shows characteristics of mixed scattering with impurity scattering contributing appreciably in heavily substituted compositions.

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ACKNOWLEDGMENTS

We thank Kevin Leikert for helping us in the synthesis of RuAl2-based compositions. We also thank Kevin Zhou for EDS composition analysis. This work was supported as part of the Center for Revolutionary Materials for Solid State Energy Conversion, an Energy Frontier Research Center, funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award No. DE-SC0001054.

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  1. Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan, 48824-1226, USA

    V. Ponnambalam, Gloria Lehr & Donald T. Morelli

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  1. V. Ponnambalam
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  2. Gloria Lehr
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Correspondence to V. Ponnambalam.

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Ponnambalam, V., Lehr, G. & Morelli, D.T. Influence of p- and n-type doping on the transport properties of the Nowotny chimney-ladder compounds RuAl2 and RuGa2. Journal of Materials Research 26, 1907–1912 (2011). https://doi.org/10.1557/jmr.2011.126

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