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Fermi surface nesting and structural transition on a metal surface: In /Cu(001)
T Nakagawa1, G I Boishin, H Fujioka
1Department of Chemistry, Graduate School of Science, Kyoto University, Japan.
Physical Review Letters
|February 15, 2001
Summary
A surface phase transition occurs on indium overlayers on copper, driven by electron instability. This leads to a periodic lattice distortion, confirmed by microscopy and electronic structure measurements.
Area of Science:
- Surface Science
- Condensed Matter Physics
- Materials Science
Background:
- Peierls-type instabilities are known to affect low-dimensional electron systems.
- Understanding surface phase transitions is crucial for designing novel electronic materials.
Purpose of the Study:
- To investigate the occurrence of Peierls-type instability and structural phase transition on a metal surface.
- To characterize the electronic and structural properties of an indium overlayer on Cu(001) during a phase transition.
Main Methods:
- Scanning tunneling microscopy (STM) was used to image the surface structure at low temperatures.
- Angle-resolved photoemission spectroscopy (ARPES) was employed to probe the electronic structure at high temperatures.
Main Results:
- An indium overlayer on Cu(001) exhibits a reversible structural phase transition around 350 K.
- The low-temperature phase shows a strong periodic lattice distortion (PLD).
- The high-temperature phase features a quasi-two-dimensional, square-shaped Fermi surface susceptible to one-dimensional nesting.
Conclusions:
- The observed transition is consistent with a Peierls-type instability driven by Fermi surface nesting.
- The study demonstrates surface-driven electronic instabilities can induce significant structural changes in metal overlayers.