Details
| Original language | English |
|---|---|
| Pages (from-to) | 15742-15751 |
| Number of pages | 10 |
| Journal | Physical Review B |
| Volume | 51 |
| Issue number | 22 |
| Publication status | Published - 1 Jan 1995 |
Abstract
Atomic sulfur chemisorbed on Ru(0001) forms a striped network of domain walls (DW's) at coverages above completion of a commensurate (3 × 3) R30°structure (θ>0.333). At high coverages (θ=0.48), this DW network transforms into a homogeneous commensurate c(2×4) structure with an ideal coverage θ=0.50. The temperature-induced phase transitions of the domain walls and the c(2×4) structures were investigated to low-energy electron diffraction spot profile analysis and compared to theoretical predictions. The phase transition of the superheavy walls, formed a low wall concentrations (coverages θ between 0.35 and 0.43), to the disordered lattice gas is found to be continuous, and compatible with a Kosterlitz-Thouless transition expected from theory. At higher coverages light DW's are formed (0.43<θ<0.48), which undergo a first-order transition, as evident from an intervening two-phase region formed by the DW phase and the incommensurate phase. Short-range order correlations are maintained in the disordered phase, which is best described by an incommensurate phase with strong disorder. Again a first-order transition is found for the commensurate c(2×4) structure, which also disorders into a short-range ordered incommensurate phase. Influences by finite-size effects are clearly visible.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Physical Review B, Vol. 51, No. 22, 01.01.1995, p. 15742-15751.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Phase transitions of the striped domain-wall phases of S on Ru(0001)
AU - Sokolowski, M.
AU - Pfnür, H.
PY - 1995/1/1
Y1 - 1995/1/1
N2 - Atomic sulfur chemisorbed on Ru(0001) forms a striped network of domain walls (DW's) at coverages above completion of a commensurate (3 × 3) R30°structure (θ>0.333). At high coverages (θ=0.48), this DW network transforms into a homogeneous commensurate c(2×4) structure with an ideal coverage θ=0.50. The temperature-induced phase transitions of the domain walls and the c(2×4) structures were investigated to low-energy electron diffraction spot profile analysis and compared to theoretical predictions. The phase transition of the superheavy walls, formed a low wall concentrations (coverages θ between 0.35 and 0.43), to the disordered lattice gas is found to be continuous, and compatible with a Kosterlitz-Thouless transition expected from theory. At higher coverages light DW's are formed (0.43<θ<0.48), which undergo a first-order transition, as evident from an intervening two-phase region formed by the DW phase and the incommensurate phase. Short-range order correlations are maintained in the disordered phase, which is best described by an incommensurate phase with strong disorder. Again a first-order transition is found for the commensurate c(2×4) structure, which also disorders into a short-range ordered incommensurate phase. Influences by finite-size effects are clearly visible.
AB - Atomic sulfur chemisorbed on Ru(0001) forms a striped network of domain walls (DW's) at coverages above completion of a commensurate (3 × 3) R30°structure (θ>0.333). At high coverages (θ=0.48), this DW network transforms into a homogeneous commensurate c(2×4) structure with an ideal coverage θ=0.50. The temperature-induced phase transitions of the domain walls and the c(2×4) structures were investigated to low-energy electron diffraction spot profile analysis and compared to theoretical predictions. The phase transition of the superheavy walls, formed a low wall concentrations (coverages θ between 0.35 and 0.43), to the disordered lattice gas is found to be continuous, and compatible with a Kosterlitz-Thouless transition expected from theory. At higher coverages light DW's are formed (0.43<θ<0.48), which undergo a first-order transition, as evident from an intervening two-phase region formed by the DW phase and the incommensurate phase. Short-range order correlations are maintained in the disordered phase, which is best described by an incommensurate phase with strong disorder. Again a first-order transition is found for the commensurate c(2×4) structure, which also disorders into a short-range ordered incommensurate phase. Influences by finite-size effects are clearly visible.
UR - http://www.scopus.com/inward/record.url?scp=0038927920&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.51.15742
DO - 10.1103/PhysRevB.51.15742
M3 - Article
AN - SCOPUS:0038927920
VL - 51
SP - 15742
EP - 15751
JO - Physical Review B
JF - Physical Review B
SN - 0163-1829
IS - 22
ER -