Magnetism and magnetotransport of cage-type compound UOs2Al10

From caged compounds with isolated U atoms to frustrated magnets with 2- or 3-atom clusters: a review of Al-rich uranium aluminides with transition metals

“…The calculated Sommerfeld coefficient γ B = 18.9 mJ K −2 mol −1 is close to the experimental value γ(0) = 25.9 mJ K −2 mol −1 estimated using specific heat data. This led the authors (Troć et al 2019) to the conclusion about the dual nature of the 5f electrons, similar to that of UFe 2 Al 10 and URu 2 Al 10 .…”

“…localized 5f electrons. The influence of the crystal field effect has been recognised by Troć et al (2019) also in transport properties and specific heat of the compound described.…”

“…The paramagnetic behavior of another 1:2:10 phase with uranium, namely UOs 2 Al 10 , was briefly mentioned by Sugai et al (2011), but without showing experimental data. The results of a systematic study of the compound UOs 2 Al 10 were only reported by Troć et al (2019) The magnetic susceptibility of UOs 2 Al 10 is strongly anisotropic, with the [100] and [001] axes showing the Curie-Weiss behavior of χ −1 (T) above about 100-150 K with the effective magnetic moment of 2.88 µ B /U (θ p = −37 K) and 2.89 µ B /U (θ p = −79 K), respectively, and the [010] direction showing a strongly curvilinear χ −1 (T) (figure 6). That strongly anisotropic temperature dependence of the susceptibility measured in each direction has been successfully described within the crystal field model, assuming the presence of the U 4+ ions with the 5f 2 configuration, i.e.…”