Details
| Original language | English |
|---|---|
| Pages (from-to) | 395-403 |
| Number of pages | 9 |
| Journal | European Physical Journal B |
| Volume | 24 |
| Issue number | 3 |
| Publication status | Published - Dec 2001 |
Abstract
Ordering of dysprosium on Mo(112) up to 1.5 monolayers has been investigated by LEED and work function analysis after adsorption at 100 K and annealing between 200 and 1000 K. At low annealing temperatures (<350-600 K) ordered structures are found, which are changed or even destroyed irreversibly by annealing steps to higher temperatures. At coverages, θ, up to 0.3 monolayer a (6 × 1) not strictly commensurate chain structure is seen, which coexists up to θ = 0.58 with a one-dimensionally incommensurate c(1.56 × 2) structure. At higher coverages up to the physical monolayer at θ ≈ 0.77, incommensurate (n × 2) followed by oblique (n × 1) structures are seen with n continuously variable with coverage. The second layer forms a p(1.33 × 1) structure. Annealing to higher temperatures causes irreversible structural transitions with strongly coverage dependent properties. Up to θ = 0.58, only a glass-like disordered phase is formed, which cannot be ordered again. In contrast, the rectangular incommensurate structures between 0.58 < θ < 0.68 remain unchanged upon annealing, whereas the structures at higher coverages and those of the second layer are transformed into commensurate (s × 1) structures with integer s. Geometrical models are presented for the non-annealed structures and possible origins for the two-dimensional concentration dependent vitrification of the Dy layers are discussed.
Keywords
- 61.14.Hg Low-energy electron diffraction (LEED) and reflection high-energy electron diffraction (RHEED), 64.70.Pf Glass transitions, 68.55.-a Thin film structure and morphology
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Condensed Matter Physics
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: European Physical Journal B, Vol. 24, No. 3, 12.2001, p. 395-403.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Metastable structures of Dy layers adsorbed on Mo(112) and their transformations
AU - Fedorus, A.
AU - Koval, V.
AU - Naumovets, A.
AU - Pfnür, Herbert
PY - 2001/12
Y1 - 2001/12
N2 - Ordering of dysprosium on Mo(112) up to 1.5 monolayers has been investigated by LEED and work function analysis after adsorption at 100 K and annealing between 200 and 1000 K. At low annealing temperatures (<350-600 K) ordered structures are found, which are changed or even destroyed irreversibly by annealing steps to higher temperatures. At coverages, θ, up to 0.3 monolayer a (6 × 1) not strictly commensurate chain structure is seen, which coexists up to θ = 0.58 with a one-dimensionally incommensurate c(1.56 × 2) structure. At higher coverages up to the physical monolayer at θ ≈ 0.77, incommensurate (n × 2) followed by oblique (n × 1) structures are seen with n continuously variable with coverage. The second layer forms a p(1.33 × 1) structure. Annealing to higher temperatures causes irreversible structural transitions with strongly coverage dependent properties. Up to θ = 0.58, only a glass-like disordered phase is formed, which cannot be ordered again. In contrast, the rectangular incommensurate structures between 0.58 < θ < 0.68 remain unchanged upon annealing, whereas the structures at higher coverages and those of the second layer are transformed into commensurate (s × 1) structures with integer s. Geometrical models are presented for the non-annealed structures and possible origins for the two-dimensional concentration dependent vitrification of the Dy layers are discussed.
AB - Ordering of dysprosium on Mo(112) up to 1.5 monolayers has been investigated by LEED and work function analysis after adsorption at 100 K and annealing between 200 and 1000 K. At low annealing temperatures (<350-600 K) ordered structures are found, which are changed or even destroyed irreversibly by annealing steps to higher temperatures. At coverages, θ, up to 0.3 monolayer a (6 × 1) not strictly commensurate chain structure is seen, which coexists up to θ = 0.58 with a one-dimensionally incommensurate c(1.56 × 2) structure. At higher coverages up to the physical monolayer at θ ≈ 0.77, incommensurate (n × 2) followed by oblique (n × 1) structures are seen with n continuously variable with coverage. The second layer forms a p(1.33 × 1) structure. Annealing to higher temperatures causes irreversible structural transitions with strongly coverage dependent properties. Up to θ = 0.58, only a glass-like disordered phase is formed, which cannot be ordered again. In contrast, the rectangular incommensurate structures between 0.58 < θ < 0.68 remain unchanged upon annealing, whereas the structures at higher coverages and those of the second layer are transformed into commensurate (s × 1) structures with integer s. Geometrical models are presented for the non-annealed structures and possible origins for the two-dimensional concentration dependent vitrification of the Dy layers are discussed.
KW - 61.14.Hg Low-energy electron diffraction (LEED) and reflection high-energy electron diffraction (RHEED)
KW - 64.70.Pf Glass transitions
KW - 68.55.-a Thin film structure and morphology
UR - http://www.scopus.com/inward/record.url?scp=0011843081&partnerID=8YFLogxK
U2 - 10.1007/s10051-001-8689-y
DO - 10.1007/s10051-001-8689-y
M3 - Article
AN - SCOPUS:0011843081
VL - 24
SP - 395
EP - 403
JO - European Physical Journal B
JF - European Physical Journal B
SN - 1434-6028
IS - 3
ER -