Electronic structure of the topological superconductor candidate Au2Pb

Wu, Yun; Drachuck, Gil; Wang, Lin -Lin; Johnson, Duane D.; Swatek, Przemyslaw; Schrunk, Benjamin; Mou, Daixiang; Huang, Lunan; Bud'ko, S. L.; Canfield, P. C.; Kaminski, Adam

doi:10.1103/PhysRevB.98.161107

Title: Electronic structure of the topological superconductor candidate ${Au}_{2} Pb$

Journal Article · Tue Oct 09 00:00:00 EDT 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.98.161107· OSTI ID:1478237

Wu, Yun ^[1]; Drachuck, Gil ^[1]; Wang, Lin -Lin ^[2]; Johnson, Duane D. ^[1]; Swatek, Przemyslaw ^[1]; Schrunk, Benjamin ^[1]; Mou, Daixiang ^[1]; Huang, Lunan ^[1]; Bud'ko, S. L. ^[1]; Canfield, P. C. ^[1]; Kaminski, Adam ^[1]

Ames Lab. and Iowa State Univ., Ames, IA (United States)
Ames Lab., Ames, IA (United States)

Here, 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. Lastly, our results provide evidence for the possible existence of a Dirac state in this material.

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Research Organization:: Ames Lab., Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: DMR-1709161; AC02-07CH11358; GBMF4411

OSTI ID:: 1478237

Alternate ID(s):: OSTI ID: 1477549

Report Number(s):: IS-J-9765; PRBMDO

Journal Information:: Physical Review B, Vol. 98, Issue 16; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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