Electronic structure of the topological superconductor candidate ${\mathrm{Au}}_{2}\mathrm{Pb}$
Abstract
Here, we use magnetization measurements, highresolution angleresolved photoemission spectroscopy (ARPES), and density functional theory (DFT) calculations to study the electronic properties of Au_{2}Pb, 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 Au_{2}Pb (111) surface at 110 K shows a shallow hole pocket at the center and flowerpetallike surface states at the corners of the Brillouin zone. These observations match the results of DFT calculations relatively well. The flowerpetallike surface states appear to originate from a Diraclike dispersion close to the zone corner. For the Au_{2}Pb (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.
 Authors:

 Ames Lab. and Iowa State Univ., Ames, IA (United States)
 Ames Lab., Ames, IA (United States)
 Publication Date:
 Research Org.:
 Ames Laboratory (AMES), Ames, IA (United States)
 Sponsoring Org.:
 USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC22)
 OSTI Identifier:
 1478237
 Alternate Identifier(s):
 OSTI ID: 1477549
 Report Number(s):
 ISJ9765
Journal ID: ISSN 24699950; PRBMDO
 Grant/Contract Number:
 DMR1709161; AC0207CH11358; GBMF4411
 Resource Type:
 Accepted Manuscript
 Journal Name:
 Physical Review B
 Additional Journal Information:
 Journal Volume: 98; Journal Issue: 16; Journal ID: ISSN 24699950
 Publisher:
 American Physical Society (APS)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
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., and Kaminski, Adam. Electronic structure of the topological superconductor candidate Au2Pb. United States: N. p., 2018.
Web. doi:10.1103/PhysRevB.98.161107.
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. Electronic structure of the topological superconductor candidate Au2Pb. United States. doi:10.1103/PhysRevB.98.161107.
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., and Kaminski, Adam. Tue .
"Electronic structure of the topological superconductor candidate Au2Pb". United States. doi:10.1103/PhysRevB.98.161107. https://www.osti.gov/servlets/purl/1478237.
@article{osti_1478237,
title = {Electronic structure of the topological superconductor candidate Au2Pb},
author = {Wu, Yun and Drachuck, Gil and Wang, Lin Lin and Johnson, Duane D. and Swatek, Przemyslaw and Schrunk, Benjamin and Mou, Daixiang and Huang, Lunan and Bud'ko, S. L. and Canfield, P. C. and Kaminski, Adam},
abstractNote = {Here, we use magnetization measurements, highresolution angleresolved 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 flowerpetallike surface states at the corners of the Brillouin zone. These observations match the results of DFT calculations relatively well. The flowerpetallike surface states appear to originate from a Diraclike 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.},
doi = {10.1103/PhysRevB.98.161107},
journal = {Physical Review B},
number = 16,
volume = 98,
place = {United States},
year = {2018},
month = {10}
}
Web of Science
Figures / Tables:
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