Chemical Doping and High-Pressure Studies of Layered β-PdBi₂ Single Crystals

DSpace/Manakin Repository

Chemical Doping and High-Pressure Studies of Layered β-PdBi₂ Single Crystals

Show full item record

Title: Chemical Doping and High-Pressure Studies of Layered β-PdBi₂ Single Crystals
Author(s):
Zhao, K.;
Lv, Bing (UT Dallas);
Xue, Y. -Y;
Zhu, X. -Y;
Deng, L. Z.;
Wu, Z.;
Chu, C. W.
Item Type: Article
Keywords: Froodite
Crystals
Semiconductor doping
Transition temperature
Abstract: We 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.
Publisher: American Physical Society
ISSN: 1098-0121
Persistent Link: http://hdl.handle.net/10735.1/4918
http://dx.doi.org/10.1103/PhysRevB.92.174404
Bibliographic Citation: Zhao, 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.
Terms of Use: ©2015 American Physical Society
Sponsors: "The work in Houston, Texas, is supported, in part, by U.S. Air Force Office of Scientific Research Grant No. FA9550-09-1-0656, the T.L.L. Temple Foundation, the John J. and Rebecca Moores Endowment, and the State of Texas through the Texas Center for Superconductivity at the University of Houston."

Files in this item

Files Size Format View
NSM-4828-273933.91.pdf 761.1Kb PDF View/Open Article

This item appears in the following Collection(s)


Show full item record