Magnetic Field Effect on the In-plane Electrical Resistivity of FeTe$_{1-x}$Se$_x$ Single Crystals

The in-plane electrical resistivity ($\rho_{ab}$) of FeTe$_{1- x}$Se$_x$ single crystals is measured as a function of temperature (T), magnetic field (H), and the angle ($\theta$) between H and electric current (I). The results reveal that $\rho_{ab}$ strongly depends on both H and $\theta$, indicating the participation of spin scattering in the electrical transport. The underlying physics will be discussed.