Chemical Doping and High-Pressure Studies of Layered β-PdBi₂ Single Crystals
| dc.contributor.author | Zhao, K. | en_US |
| dc.contributor.author | Lv, Bing | en_US |
| dc.contributor.author | Xue, Y. -Y | en_US |
| dc.contributor.author | Zhu, X. -Y | en_US |
| dc.contributor.author | Deng, L. Z. | en_US |
| dc.contributor.author | Wu, Z. | en_US |
| dc.contributor.author | Chu, C. W. | en_US |
| dc.contributor.utdAuthor | Lv, Bing | en_US |
| dc.date.accessioned | 2016-07-07T16:36:45Z | |
| dc.date.available | 2016-07-07T16:36:45Z | |
| dc.date.created | 2015-11-04 | en_US |
| dc.date.issued | 2015-11-04 | en_US |
| dc.description.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. | en_US |
| dc.description.sponsorship | "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." | en_US |
| dc.identifier.bibliographicCitation | 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. | en_US |
| dc.identifier.issn | 1098-0121 | en_US |
| dc.identifier.issue | 17 | en_US |
| dc.identifier.uri | http://hdl.handle.net/10735.1/4918 | |
| dc.identifier.volume | 92 | en_US |
| dc.language.iso | en | en_US |
| dc.publisher | American Physical Society | en_US |
| dc.relation.uri | http://dx.doi.org/10.1103/PhysRevB.92.174404 | |
| dc.rights | ©2015 American Physical Society | en_US |
| dc.source | Physical Review B - Condensed Matter and Materials Physics | |
| dc.subject | Froodite | en_US |
| dc.subject | Crystals | en_US |
| dc.subject | Semiconductor doping | en_US |
| dc.subject | Transition temperature | en_US |
| dc.title | Chemical Doping and High-Pressure Studies of Layered β-PdBi₂ Single Crystals | en_US |
| dc.type.genre | Article | en_US |