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 similar to 18.9 K, T-N2 similar to 7.0 K, and T-N3 similar to 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.