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Phase coexistence during surface phase transitions.

J B Hannon1, F J zu Heringdorf, J Tersoff

  • 1IBM Research Division, T.J. Watson Research Center, P.O. Box 218, Yorktown Heights, New York 10598, USA.

Physical Review Letters
|June 1, 2001
PubMed
Summary
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Standard models fail to explain surface phase transitions. Researchers observed phase coexistence over a wide temperature range, revealing long-range interactions drive this phenomenon, a finding applicable to many surface phase transitions.

Area of Science:

  • Surface science
  • Materials science
  • Condensed matter physics

Background:

  • Standard thermodynamic models do not fully explain observed phenomena at first-order surface phase transitions.
  • Understanding domain evolution is crucial for predicting material properties.

Purpose of the Study:

  • To investigate the domain evolution during the Si(111)-(7x7) to (1x1) surface phase transition.
  • To compare experimental observations with theoretical predictions regarding phase coexistence.

Main Methods:

  • Utilized low-energy electron microscopy (LEEM) to monitor domain evolution.
  • Measured the transition over an extended temperature range.
  • Performed detailed, quantitative theoretical modeling.

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Main Results:

  • Observed phase coexistence over an extended temperature range, contrary to standard models.
  • Identified long-range elastic and electrostatic domain interactions as the cause of coexistence.
  • Experimental data aligned with theoretical predictions.

Conclusions:

  • Phase coexistence is a key feature of the Si(111)-(7x7) to (1x1) transition.
  • Long-range interactions significantly influence surface phase transitions.
  • Phase coexistence is predicted to be a universal characteristic of surface phase transitions.