Magnetic, thermal, and transport properties of layered arsenides BaRu2As2 and SrRu2As2

R. Nath, Yogesh Singh, and D. C. Johnston
Phys. Rev. B 79, 174513 – Published 8 May 2009

Abstract

The magnetic, thermal, and transport properties of polycrystalline BaRu2As2 and SrRu2As2 samples with the ThCr2Si2 structure were investigated by means of magnetic susceptibility χ(T), electrical resistivity ρ(T), and heat capacity Cp(T) measurements. The temperature (T) dependence of ρ indicates metallic character for both compounds with residual resistivity ratios ρ(310K)/ρ(2K) of 17 and 5 for the Ba and Sr compounds, respectively. The Cp(T) results reveal a low-T Sommerfeld coefficient γ=4.9(1) and 4.1(1)mJ/molK2 and Debye temperature ΘD=271(7) and 271(4) K for the Ba and Sr compounds, respectively. The χ(T) was found to be diamagnetic with a small absolute value for both compounds. No transitions were found for BaRu2As2 above 1.8 K. The χ(T) data for SrRu2As2 exhibit a cusp at 200K, possibly an indication of a structural and/or magnetic transition. We discuss the properties of BaRu2As2 and SrRu2As2 in the context of other ThCr2Si2-type and ZrCuSiAs-type transition metal pnictides.

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  • Received 28 January 2009

DOI:https://doi.org/10.1103/PhysRevB.79.174513

©2009 American Physical Society

Authors & Affiliations

R. Nath, Yogesh Singh, and D. C. Johnston

  • Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

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Vol. 79, Iss. 17 — 1 May 2009

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