Publication Date

10-9-2018

Department

Ames Laboratory; Physics and Astronomy; Materials Science and Engineering

Campus Units

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

Volume Number

98

Issue Number

16

First Page

161107(R)

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

Department of Energy Subject Categories

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Publisher

Iowa State University Digital Repository, Ames IA (United States)

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