dc.identifier.uri |
http://dx.doi.org/10.15488/2786 |
|
dc.identifier.uri |
http://www.repo.uni-hannover.de/handle/123456789/2812 |
|
dc.contributor.author |
Fedorus, A.
|
|
dc.contributor.author |
Kolthoff, D.
|
|
dc.contributor.author |
Koval, V.
|
|
dc.contributor.author |
Lyuksyutov, I.
|
|
dc.contributor.author |
Naumovets, A.
|
|
dc.contributor.author |
Pfnür, Herbert
|
|
dc.date.accessioned |
2018-02-19T14:57:14Z |
|
dc.date.available |
2018-02-19T14:57:14Z |
|
dc.date.issued |
2000 |
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dc.identifier.citation |
Fedorus, A.; Kolthoff, D.; Koval, V.; Lyuksyutov, I.; Naumovets, A.; Pfnür, H.: Phase transitions in the adsorption system Li/Mo(112). In: Physical Review B 62 (2000), Nr. 4, S. 2852-2861. DOI: https://doi.org/10.1103/PhysRevB.62.2852 |
|
dc.description.abstract |
Experimental studies of the phase transitions in the adsorption system Li/Mo(112) are presented. This system is a model system for highly anisotropic interactions. From measurements of the half-widths of the low-energy electron diffraction spot profiles a phase diagram is derived for the whole submonolayer region of coverage in the temperature range 100–500 K. The commensurate low-coverage phases below θ=0.6 form chains normal to the troughs of the substrate. The commensurate p(4×1) phase, which is completed at a coverage, θ, of 0.25 monolayers (ML), seems to be truly long range ordered, whereas the p(2×1) phase at θ=0.5 still contains domain boundaries even at the lowest temperature of 100 K. Both undergo temperature-driven order-disorder phase transitions. In contrast, the incommensurate phases existing in the coverage range θ=0.66–0.90 form chains along the troughs, which are only weakly coupled normal to the troughs of the substrate. These phases exhibit two coverage-driven phase transitions from rectangular to oblique units cells and back at critical coverages of 0.66 and 0.85, respectively, and represent floating solids. As a function of temperature, they undergo a two-dimensional melting transition. Close to the critical coverages, the melting temperatures show a sharp drop below the temperature range accessible in our experiments. Both functional dependences of the angular deviation from 90° and of the melting temperature on coverage are in good agreement with a phenomenological theoretical model, assuming an instability of the shear modulus of the adsorbate unit cell at the critical coverages. |
eng |
dc.language.iso |
eng |
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dc.publisher |
College Park, MD : American Physical Society |
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dc.relation.ispartofseries |
Physical Review B 62 (2000), Nr. 4 |
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dc.rights |
Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden. |
|
dc.subject |
phase transition |
eng |
dc.subject |
anisotropic interactions |
eng |
dc.subject.ddc |
530 | Physik
|
ger |
dc.title |
Phase transitions in the adsorption system Li/Mo(112) |
|
dc.type |
Article |
|
dc.type |
Text |
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dc.relation.issn |
10980121 |
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dc.relation.doi |
https://doi.org/10.1103/PhysRevB.62.2852 |
|
dc.bibliographicCitation.issue |
4 |
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dc.bibliographicCitation.volume |
62 |
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dc.bibliographicCitation.firstPage |
2852 |
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dc.bibliographicCitation.lastPage |
2861 |
|
dc.description.version |
publishedVersion |
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tib.accessRights |
frei zug�nglich |
|