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Title: Electronic structure of the topological superconductor candidate Au 2 Pb

Abstract

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.

Authors:
 [1];  [1];  [2];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  2. 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) (SC-22)
OSTI Identifier:
1478237
Alternate Identifier(s):
OSTI ID: 1477549
Report Number(s):
IS-J-9765
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:  
DMR-1709161; AC02-07CH11358; GBMF4411
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 16; Journal ID: ISSN 2469-9950
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, 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.},
doi = {10.1103/PhysRevB.98.161107},
journal = {Physical Review B},
number = 16,
volume = 98,
place = {United States},
year = {2018},
month = {10}
}

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Figures / Tables:

FIG. 1 FIG. 1: Temperature dependent magnetization measurements of Au2Pb. Inset shows the crystal with naturally grown facets.

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