Phase coexistence during surface phase transitions |
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Authors: | Hannon J B zu Heringdorf F J Tersoff J Tromp R M |
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Affiliation: | IBM Research Division, T.J. Watson Research Center, P.O. Box 218, Yorktown Heights, New York 10598, USA. |
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Abstract: | In contrast to standard thermodynamic models, we observe phase coexistence over an extended temperature range at a first-order surface phase transition. We have measured the domain evolution of the Si(111)-( 7x7) to ( 1x1) phase transition with temperature, using low-energy electron microscopy. Comparison with detailed, quantitative theoretical predictions shows that coexistence is due to long-range elastic and electrostatic domain interactions. Phase coexistence is predicted to be a universal feature of surface phase transitions. |
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