This work presents a study on a new uranium iron arsenide UFeAs. By implementing Bi-flux synthesis, we were able to grow mm-sized single crystals of this compound, which show twinning. UFeAs is one of only two known uranium iron arsenides. It adopts a monoclinic, UCrP-type crystal structure (space group 2/, Pearson symbol 18, = 7.050(2) Å, = 3.8582(9) Å, = 9.634(1) Å, β = 100.25(1)°). The magnetic susceptibility of UFeAs indicates it to be an antiferromagnet with = 47 K and μ = 4.94 μ per formula unit, signaling that both U and Fe are likely magnetic in this material. The material appears to be anisotropic, with a small (likely ferromagnetic) spin reorientation transition around = 29 K. The Sommerfeld coefficient γ = 135 mJ mol K suggests enhanced effective electron mass in UFeAs, while electrical resistivity indicates metallic, Kondo-like behavior.
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| http://dx.doi.org/10.1021/acs.inorgchem.3c03837 | DOI Listing |
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