Issue |
Europhys. Lett.
Volume 33, Number 9, March III 1996
|
|
---|---|---|
Page(s) | 673 - 678 | |
Section | Condensed matter: structure, thermal and mechanical properties | |
DOI | https://doi.org/10.1209/epl/i1996-00397-8 | |
Published online | 01 September 2002 |
Incommensurate-commensurate transition via domain wall evaporation in an overlayer
1
Institut für Festkörperphysik, Universität Hannover
Appelstraße 2, D-30167, Hannover, Germany
2
Institut für Theoretische Physik, Universität Hannover
Appelstraße 2, D-30167, Hannover, Germany
Received:
17
July
1995
Accepted:
2
February
1996
A new mechanism is proposed in a two-dimensional system
for the transition from an incommensurate
phase containing walls of striped symmetry to a commensurate phase
via evaporation of the domain walls into a gas of
point-like defects (PD).
The point-like defect can be a vacancy, interstitial
or a composite defect like domain wall loop. The precise
nature of the PD is not important in the limit of vanishing
DW density.
The incommensurate-commensurate transition via domain wall evaporation
(DWE transition) occurs under the condition
of fixed overlayer coverage, and can be of either first or
second order. We study the possible types of the phase diagram
in the case of DWE.
Experimental examples are discussed.
In the case of the second-order DWE transition
the domain wall density
behaves near Tc like
.
PACS: 68.35.Rh – Phase transitions and critical phenomena / 64.70.Rh – Commensurate-incommensurate transitions
© EDP Sciences, 1996
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