Magneto-transport properties of proposed triply degenerate topological semimetal Pd₃Bi₂S₂

We report transport properties of single-crystalline Pd₃Bi₂S₂, which has been predicted to host an unconventional electronic phase of matter beyond three-dimensional Dirac and Weyl semimetals. The resistivity shows field-induced metal to semiconductor-like crossover at low temperature which is commonly observed phenomena in topological semimetals. Large, anisotropic and non-saturating magnetoresistance (MR) has been observed in transverse experimental configuration. At 2 K and 9 T, the MR value reaches as high as ∼1.1×10³ (%). Hall resistivity reveals the presence of two types of charge carriers and has been analyzed using two-band model. However, the carrier density in Pd₃Bi₂S₂ is comparable to that observed in topological nodal-line semimetals (n∼10²⁰ -10²³ cm^-3 ) and conventional metals. In spite of large carrier density, the mobility of charge carrier in Pd₃Bi₂S₂ is found to be quite high (∼ 0.75 × 10⁴ cm² V^-1 s^-1 for hole and ∼ 0.3 × 10⁴ cm² V^-1 s^-1 for electron) and comparable to that re-ported for different topological electronic materials. The observed magneto-electrical properties indicate that Pd₃Bi₂S₂ may be a new member of the topological semimetal family, which can have a significant impact in technological applications. (author)