SnTe microcrystals: Surface cleaning of a topological crystalline insulator

Investigating nanometer and micron sized materials thought to exhibit topological surface properties that can present a challenge, as clean surfaces are a pre-requisite for band structure measurements when using nano-ARPES or laser-ARPES in ultra-high vacuum. This issue is exacerbated when dealing w...

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Veröffentlicht in:Applied physics letters 2016-02, Vol.108 (6)
Hauptverfasser: Saghir, M., Walker, M., McConville, C. F., Balakrishnan, G.
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container_title Applied physics letters
container_volume 108
creator Saghir, M.
Walker, M.
McConville, C. F.
Balakrishnan, G.
description Investigating nanometer and micron sized materials thought to exhibit topological surface properties that can present a challenge, as clean surfaces are a pre-requisite for band structure measurements when using nano-ARPES or laser-ARPES in ultra-high vacuum. This issue is exacerbated when dealing with nanometer or micron sized materials, which have been prepared ex-situ and so have been exposed to atmosphere. We present the findings of an XPS study where various cleaning methods have been employed to reduce the surface contamination and preserve the surface quality for surface sensitive measurements. Microcrystals of the topological crystalline insulator SnTe were grown ex-situ and transferred into ultra high vacuum (UHV) before being treated with either atomic hydrogen, argon sputtering, annealing, or a combination of treatments. The samples were also characterised using the scanning electron microscopy, both before and after treatment. It was found that atomic hydrogen cleaning with an anneal cycle (200 °C) gave the best clean surface results.
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subjects ANNEALING
Applied physics
ARGON
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Cleaning
Crystal structure
Crystallinity
CRYSTALS
High vacuum
HYDROGEN
LASERS
MATERIALS
Microcrystals
SCANNING ELECTRON MICROSCOPY
SPUTTERING
SURFACE CLEANING
SURFACE PROPERTIES
SURFACES
TIN TELLURIDES
TOPOLOGY
X-RAY PHOTOELECTRON SPECTROSCOPY
title SnTe microcrystals: Surface cleaning of a topological crystalline insulator
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