The magnetic, thermal, and transport properties of polycrystalline and samples with the structure were investigated by means of magnetic susceptibility , electrical resistivity , and heat capacity measurements. The temperature dependence of indicates metallic character for both compounds with residual resistivity ratios of 17 and 5 for the Ba and Sr compounds, respectively. The results reveal a low- Sommerfeld coefficient and and Debye temperature and 271(4) K for the Ba and Sr compounds, respectively. The was found to be diamagnetic with a small absolute value for both compounds. No transitions were found for above 1.8 K. The data for exhibit a cusp at , possibly an indication of a structural and/or magnetic transition. We discuss the properties of and in the context of other -type and ZrCuSiAs-type transition metal pnictides.
- Received 28 January 2009
©2009 American Physical Society