We observe that ultrathin Fe/Cu3Au(001) films in the 6-13 Angstrom thickness range, beyond the thickness of pseudomorphism breakdown at room temperature, exhibit a temperature dependent structural phase transition in the range T(c)approximate to345-380 K. In the high temperature state the Fe film becomes pseudomorphic, while breakdown of pseudomorphism reversibly occurs as the system is cooled below the transition temperature. The difference between substrate and overlayer thermal expansion coefficient is highlighted as the driving force for the observed transition.
Temperature driven reversible breakdown of pseudomorphism in ultrathin Fe/Cu3Au films
MORGANTE, ALBERTO;
2004-01-01
Abstract
We observe that ultrathin Fe/Cu3Au(001) films in the 6-13 Angstrom thickness range, beyond the thickness of pseudomorphism breakdown at room temperature, exhibit a temperature dependent structural phase transition in the range T(c)approximate to345-380 K. In the high temperature state the Fe film becomes pseudomorphic, while breakdown of pseudomorphism reversibly occurs as the system is cooled below the transition temperature. The difference between substrate and overlayer thermal expansion coefficient is highlighted as the driving force for the observed transition.File in questo prodotto:
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