Anisotropies of the electrical resistivity and Hall effect in UAsSe

We show that anisotropy of the resistivity in UAsSe proves that its total resistivity contains both an isotropic spin disorder component (controlled by RKKY exchange interaction) and an anisotropic single impurity Kondo-like (TK = 50 K) component. They are present in both paramagnetic and ordered states. This uniaxial and collinear ferromagnet (below 113 K) exhibits high magnetocrystalline anisotropy. Examination of the Hall effect in the paramagnetic phase (up to 430 K) showed that the isotropic normal Hall coefficient R0 = −8.8×10−4cm3 C−1 (0.47 e− fu−1 in the single band model) is accompanied by a highly anisotropic spontaneous Hall coefficient. This is equal to 0.78 and 3.0 cm3 C−1 for Rsac and Rsab (magnetic field along the c or b axis) respectively.