期刊
PHYSICAL REVIEW B
卷 79, 期 17, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.174513
关键词
barium compounds; electrical resistivity; magnetic susceptibility; magnetic transitions; ruthenium compounds; specific heat; strontium compounds; superconducting materials
资金
- Department of Energy-Basic Energy Sciences [DE-AC02-07CH11358.]
The magnetic, thermal, and transport properties of polycrystalline BaRu2As2 and SrRu2As2 samples with the ThCr2Si2 structure were investigated by means of magnetic susceptibility chi(T), electrical resistivity rho(T), and heat capacity C-p(T) measurements. The temperature (T) dependence of rho indicates metallic character for both compounds with residual resistivity ratios rho(310 K)/rho(2 K) of 17 and 5 for the Ba and Sr compounds, respectively. The C-p(T) results reveal a low-T Sommerfeld coefficient gamma=4.9(1) and 4.1(1) mJ/mol K-2 and Debye temperature Theta(D)=271(7) and 271(4) K for the Ba and Sr compounds, respectively. The chi(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 chi(T) data for SrRu2As2 exhibit a cusp at similar to 200 K, 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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