Complex magnetic and transport properties of EuBi₂ single crystal

We report the magnetic and transport properties of EuBi₂ single crystal. EuBi₂ exhibits complex magnetic behavior at low temperatures. In both the in-plane and out-of-plane directions, three antiferromagnetic (AFM) transitions have been observed at T_N1 ∼ 18.9 K, T_N2 ∼ 7.0 K, and T_N3 ∼ 3.1 K. Among them, the transitions at T_N2 and T_N3 represent the canted AFM orders with ferromagnetic components. As the magnetic field increases, the transition at T_N3 is rapidly suppressed to disappearance. However, the transitions at T_N1 and T_N2 persist until high fields and their signatures can also be reflected in the resistivity and specific heat. Above the magnetic transition temperature T_N1, the resistivity of EuBi₂ increases linearly with temperature, exhibiting the strange-metal behavior. In the magnetically ordered region below T_N1, EuBi₂ exhibits the weak antilocalization (WAL) effect and large magnetoresistance (475% at 1.8 K and 14 T). It is suggested that the magnetic ordering significantly enhances the spin–orbital coupling interaction and induces the WAL effect.