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
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. | |
License of this version: | Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden. |
Document Type: | Article |
Publishing status: | publishedVersion |
Issue Date: | 2000 |
Appears in Collections: | Fakultät für Mathematik und Physik |
pos. | country | downloads | ||
---|---|---|---|---|
total | perc. | |||
1 | Germany | 28 | 49.12% | |
2 | United States | 15 | 26.32% | |
3 | China | 8 | 14.04% | |
4 | No geo information available | 1 | 1.75% | |
5 | Ukraine | 1 | 1.75% | |
6 | Taiwan | 1 | 1.75% | |
7 | Portugal | 1 | 1.75% | |
8 | Hungary | 1 | 1.75% | |
9 | Canada | 1 | 1.75% |
Hinweis
Zur Erhebung der Downloadstatistiken kommen entsprechend dem „COUNTER Code of Practice for e-Resources“ international anerkannte Regeln und Normen zur Anwendung. COUNTER ist eine internationale Non-Profit-Organisation, in der Bibliotheksverbände, Datenbankanbieter und Verlage gemeinsam an Standards zur Erhebung, Speicherung und Verarbeitung von Nutzungsdaten elektronischer Ressourcen arbeiten, welche so Objektivität und Vergleichbarkeit gewährleisten sollen. Es werden hierbei ausschließlich Zugriffe auf die entsprechenden Volltexte ausgewertet, keine Aufrufe der Website an sich.