Complex magnetic and transport properties of EuBi₂ single crystal

Abstract We report the magnetic and transport properties of EuBi 2 single crystal. EuBi 2 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 EuBi 2 increases linearly with temperature, exhibiting the strange-metal behavior. In the magnetically ordered region below T N1 , EuBi 2 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.