Zhao, K.Lv, BingXue, Y. -YZhu, X. -YDeng, L. Z.Wu, Z.Chu, C. W.2016-07-072016-07-072015-11-042015-11-041098-0121http://hdl.handle.net/10735.1/4918We have systematically grown large single crystals of the layered compounds β-PdBi₂, and both the hole-doped PdBi₂₋ₓPb₂ and the electron-doped NaₓPdBi₂, and studied their magnetic and transport properties. Hall effect measurements on PdBi₂, PdBi₁₈Pb₀₂, and Na₀.₀₅₇PdBi₂ show that the charge transport is dominated by electrons in all of the samples. The electron concentration is substantially reduced upon Pb doping in PdBi₂₋ₓPbₓ and increased upon Na intercalation in NaₓPdBi₂, indicating effective hole doping by Pb and electron doping by Na. We observed a monotonic decrease of the superconducting transition temperature (T_c) from 5.4 K in undoped PdBi₂ to less than 2 K for x > 0.35 in hole-doped PdBi₂₋ₓPbₓ. Meanwhile, a rapid decrease of T_c with Na intercalation is also observed in the electron-doped NaₓPdBi₂, which is in disagreement with the theoretical expectation. In addition, both the magnetoresistance and Hall resistance further reveal evidence for a possible spin excitation associated with Fermi surface reconstruction at ∼50 K in the Na-intercalated PdBi₂ sample. The complete phase diagram is thus established from hole doping to electron doping. Meanwhile, a high-pressure study of the undoped PdBi₂ shows that the T_c is linearly suppressed under pressure with a dT_c/dP coefficient of -0.28 K/GPa.en©2015 American Physical SocietyFrooditeCrystalsSemiconductor dopingTransition temperatureArticleZhao, K., B. Lv, Y. -Y Xue, X. -Y Zhu, et al. 2015. "Chemical doping and high-pressure studies of layered β-PdBi₂ single crystals." Physical Review B - Condensed Matter and Materials Physics 92(17), doi:10.1103/PhysRevB.92.174404.9217