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Article
Electronic structure of the topological superconductor candidate Au2Pb
Ames Laboratory Accepted Manuscripts
  • Yun Wu, Iowa State University and Ames Laboratory
  • Gil Drachuck, Iowa State University and Ames Laboratory
  • Lin-Lin Wang, Ames Laboratory
  • Duane D. Johnson, Iowa State University and Ames Laboratory
  • Przemyslaw Swatek, Iowa State University and Ames Laboratory
  • Benjamin Schrunk, Iowa State University and Ames Laboratory
  • Daixiang Mou, Iowa State University and Ames Laboratory
  • Lunan Huang, Iowa State University and Ames Laboratory
  • Sergey L. Bud’ko, Iowa State University and Ames Laboratory
  • Paul C. Canfield, Iowa State University and Ames Laboratory
  • Adam Kaminski, Iowa State University and Ames Laboratory
Publication Date
10-9-2018
Department
Ames Laboratory; Physics and Astronomy; Materials Science and Engineering
OSTI ID+
1478237
Report Number
IS-J 9765
DOI
10.1103/PhysRevB.98.161107
Journal Title
Physical Review B
Abstract

We use magnetization measurements, high-resolution angle-resolved photoemission spectroscopy (ARPES), and density functional theory (DFT) calculations to study the electronic properties of Au2Pb, a topological superconductor candidate. The magnetization measurements reveal three discontinuities at 40, 51, and 99 K that agree well with reported structural phase transitions. To measure the band structure along desired crystal orientations, we utilized polishing, sputtering, and annealing to obtain clean flat sample surfaces. ARPES measurements of the Au2Pb (111) surface at 110 K shows a shallow hole pocket at the center and flower-petal-like surface states at the corners of the Brillouin zone. These observations match the results of DFT calculations relatively well. The flower-petal-like surface states appear to originate from a Dirac-like dispersion close to the zone corner. For the Au2Pb(001) surface at 150 K, ARPES reveals at least one electron pocket between the Γ and M points, consistent with the DFT calculations. Our results provide evidence for the possible existence of a Dirac state in this material.

DOE Contract Number(s)
DMR-1709161; AC02-07CH11358; GBMF4411
Language
en
Publisher
Iowa State University Digital Repository, Ames IA (United States)
Citation Information
Yun Wu, Gil Drachuck, Lin-Lin Wang, Duane D. Johnson, et al.. "Electronic structure of the topological superconductor candidate Au2Pb" Vol. 98 Iss. 16 (2018) p. 161107(R)
Available at: http://works.bepress.com/duane_johnson/138/