We report the magnetic, electrical, and thermal transport properties of three Sc-based 315-type materials \(\hbox {Pr}_3\hbox {ScBi}_5\) , \(\hbox {Nd}_3\hbox {ScBi}_5\) , and \(\hbox {Sm}_3\hbox {ScBi}_5\) single crystals, which belong to the recently widely studied quasi-one-dimensional \(\hbox {Ln}_3\hbox {MPn}_5\) (Ln = La–Nd, Sm; M = transition metal, Mg; Pn = pnictide) family. The three materials undergo one or two antiferromagnetic (AFM) transitions at low temperatures. The Neel temperature can be tuned by a magnetic field within the distorted kagome plane of \(\hbox {Pr}_3\hbox {ScBi}_5\) and \(\hbox {Nd}_3\hbox {ScBi}_5\) , but it remains almost unchanged in the long-axis direction and \(\hbox {Sm}_3\hbox {ScBi}_5\) . In addition, the magnetic field-dependent magnetization reveals the existence of metamagnetic transitions within the distorted kagome plane of \(\hbox {Pr}_3\hbox {ScBi}_5\) and \(\hbox {Nd}_3\hbox {ScBi}_5\) , which can be classified as 1/3 and 1/6 fractional magnetization phases. All three materials exhibit metallic behavior, and the resistivity undergoes rapid changes at the AFM transitions and metamagnetic transitions, demonstrating the influence of magnetism on electrical transport properties. The magnetic phase diagrams of these three materials have also been constructed based on the measurements. These findings provide detailed transport properties of these three materials and insight into Sc-based \(\hbox {Ln}_3\hbox {MPn}_5\) system.
