Magneto-transport properties of proposed triply degenerate topological semimetal Pd_3Bi_2S_2

摘要

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. Similar to several topological systems, the resistivity shows field-induced metal to semiconductor-like crossover at low temperature. Large, anisotropic, and non-saturating magnetoresistance has been observed in the transverse experimental configuration. At 2 K and 9 T, the MR value reaches as high as similar to 1.1 x 10(3)%. Hall resistivity reveals the presence of two types of charge carriers and has been analyzed using the two-band model. In spite of the large density ( 10(21) cm(-3)), the mobility of charge carriers is found to be quite high (similar to 0.75 x 10(4) cm(2) V-1 s(-1) for the hole and similar to 0.3 x 10(4) cm(2) V-1 s(-1) for the electron). 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. Published by AIP Publishing.