Abstract
We report the growth process, structure, and electronic states of 1 unit layer (u.l.) of a Ce-Pt intermetallic compound on Pt(111) using scanning tunneling microscopy/spectroscopy (STM/STS) and low-energy electron diffraction. An ordered structure was observed in the form of films or nanoislands depending on Ce dose by annealing at around 700 K. A structural model constructed from atomically resolved STM images and quasiparticle interference (QPI) patterns indicates the formation of a new surface compound 1 u.l. on Pt(111) terminated by a Pt layer. A lateral lattice constant of the 1 u.l. on Pt(111) is expanded from the value of a bulk crystal to match the Pt(111) substrate. By measuring spectra and QPI, we observed an onset energy of the surface state found on Pt(111) above Fermi energy () shifts below on the Pt layer of the 1 u.l. due to charge transfer from the underneath layer. We discuss a possible two-dimensional coherent Kondo effect with the observed spectra on the 1 u.l. .
- Received 5 August 2021
- Revised 9 October 2021
- Accepted 12 October 2021
DOI:https://doi.org/10.1103/PhysRevB.104.165419
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