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Direct observation of surface chemical order by scanning tunneling microscopy

Michael Schmid, H. L. Stadler, Peter Varga

Open publisher page 230 citations

Abstract

We present the first scanning tunneling microscopy (STM) study which allows clear discrimination of two chemical species in a metal alloy. Special tunneling conditions, which we attribute to an adsorbate at the STM tip, cause a difference in corrugation between Pt and Ni atoms of 0.3 \AA{}. The STM data reveal chemical short-range order at the surface, which is in agreement with embedded atom simulations and can be understood as small domains of an L${1}_{0}$ ordered phase.

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What this paper is about

We present the first scanning tunneling microscopy (STM) study which allows clear discrimination of two chemical species in a metal alloy. Special tunneling conditions, which we attribute to an adsorbate at the STM tip, cause a difference in corrugation between Pt and Ni atoms of 0.3 \AA{}. The STM data reveal chemical short-range order at the surface, which is in agreement with embedded atom simulations and can be understood as small domains of an L${1}_{0}$ ordered phase.

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OpenAlex reports 230 citations for this work. Citation counts describe recorded attention and do not establish research quality.

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Available abstract

We present the first scanning tunneling microscopy (STM) study which allows clear discrimination of two chemical species in a metal alloy. Special tunneling conditions, which we attribute to an adsorbate at the STM tip, cause a difference in corrugation between Pt and Ni atoms of 0.3 \AA{}. The STM data reveal chemical short-range order at the surface, which is in agreement with embedded atom simulations and can be understood as small domains of an L${1}_{0}$ ordered phase.

Key concepts: Scanning tunneling microscope, Scanning tunneling spectroscopy, Materials science, Quantum tunnelling, Spin polarized scanning tunneling microscopy, Chemical physics, Atom (system on chip), Condensed matter physics

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