Weak localization and electron-phonon interaction in layered Zintl phase SrIn₂P₂single crystal

Recently, the Zintl phase SrIn₂P₂single crystal was proposed to be a topological insulator candidate under lattice strain. Here, we report systematic electrical transport studies on the unstrained layered SrIn₂P₂single crystals. The resistance presents a minimum value aroundT_c= 136 K and then increases remarkably at low temperature. Distinct negative magnetoresistance belowT_c, combined with the anomalous resistance, implies the carriers are weak localized at low temperature due to strong quantum coherence. Further analysis based on three-dimensional weak localization (WL) model suggests that the electron-phonon interaction dominates the phase decoherence process. Moreover, Hall measurements indicate that the transport properties are mainly dominated by hole-type carriers, and the WL effect is obviously affected by the carrier transport. These findings not only provide us a promising platform for the fundamental physical research but also open up a new route for exploring the potential electronic applications.