New ordered phases and multicriticality of Te/Ni(111)

Model calculations and comparisons with experiment

S. Thevuthasan, S. R. McKay, W. N. Unertl

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The chemisorbed system tellurium on Ni(111) has been studied using a lattice gas model with pair interactions as long range as sixth neighbor. We discover three distinct (2y/3x2v/3)R 30 phases: low coverage (θ= 1/12), centered (θ = 1/6), and high coverage (θ= 1/4), when interactions are adjusted to match qualitatively the other features of the experimental phase diagram. Each pair of neighboring ordered phases is separated by a coexistence region at low temperatures. The low-coverage 2v3 phase disorders via a first-order transition at higher temperature. At higher coverage, a (v'lXV’DR 30 phase occurs at intermediate temperature. This phase melts by a first-order transition at low coverages and a continuous, three-state Potts transition at higher coverages. Thus, the simulations suggest that this chemisorbed system may provide an experimental realization of Potts tricritical behavior. Alternate sets of interactions in this long-range lattice gas model produce the (VIXV 1)R 19, (3x3), and (2x2) phases, which have been reported for other chemisorbed systems on triangular lattices.

Original languageEnglish
Pages (from-to)2158-2161
Number of pages4
JournalJournal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
Volume7
Issue number3
DOIs
Publication statusPublished - 1989
Externally publishedYes

Fingerprint

Gases
Tellurium
Experiments
interactions
tellurium
gases
Temperature
Phase diagrams
phase diagrams
disorders
simulation
temperature

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Cite this

New ordered phases and multicriticality of Te/Ni(111) : Model calculations and comparisons with experiment. / Thevuthasan, S.; McKay, S. R.; Unertl, W. N.

In: Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films, Vol. 7, No. 3, 1989, p. 2158-2161.

Research output: Contribution to journalArticle

@article{c6f897ecf9ec4c8db3bc15ec011c8e7b,
title = "New ordered phases and multicriticality of Te/Ni(111): Model calculations and comparisons with experiment",
abstract = "The chemisorbed system tellurium on Ni(111) has been studied using a lattice gas model with pair interactions as long range as sixth neighbor. We discover three distinct (2y/3x2v/3)R 30 phases: low coverage (θ= 1/12), centered (θ = 1/6), and high coverage (θ= 1/4), when interactions are adjusted to match qualitatively the other features of the experimental phase diagram. Each pair of neighboring ordered phases is separated by a coexistence region at low temperatures. The low-coverage 2v3 phase disorders via a first-order transition at higher temperature. At higher coverage, a (v'lXV’DR 30 phase occurs at intermediate temperature. This phase melts by a first-order transition at low coverages and a continuous, three-state Potts transition at higher coverages. Thus, the simulations suggest that this chemisorbed system may provide an experimental realization of Potts tricritical behavior. Alternate sets of interactions in this long-range lattice gas model produce the (VIXV 1)R 19, (3x3), and (2x2) phases, which have been reported for other chemisorbed systems on triangular lattices.",
author = "S. Thevuthasan and McKay, {S. R.} and Unertl, {W. N.}",
year = "1989",
doi = "10.1116/1.575949",
language = "English",
volume = "7",
pages = "2158--2161",
journal = "Journal of Vacuum Science and Technology A",
issn = "0734-2101",
publisher = "AVS Science and Technology Society",
number = "3",

}

TY - JOUR

T1 - New ordered phases and multicriticality of Te/Ni(111)

T2 - Model calculations and comparisons with experiment

AU - Thevuthasan, S.

AU - McKay, S. R.

AU - Unertl, W. N.

PY - 1989

Y1 - 1989

N2 - The chemisorbed system tellurium on Ni(111) has been studied using a lattice gas model with pair interactions as long range as sixth neighbor. We discover three distinct (2y/3x2v/3)R 30 phases: low coverage (θ= 1/12), centered (θ = 1/6), and high coverage (θ= 1/4), when interactions are adjusted to match qualitatively the other features of the experimental phase diagram. Each pair of neighboring ordered phases is separated by a coexistence region at low temperatures. The low-coverage 2v3 phase disorders via a first-order transition at higher temperature. At higher coverage, a (v'lXV’DR 30 phase occurs at intermediate temperature. This phase melts by a first-order transition at low coverages and a continuous, three-state Potts transition at higher coverages. Thus, the simulations suggest that this chemisorbed system may provide an experimental realization of Potts tricritical behavior. Alternate sets of interactions in this long-range lattice gas model produce the (VIXV 1)R 19, (3x3), and (2x2) phases, which have been reported for other chemisorbed systems on triangular lattices.

AB - The chemisorbed system tellurium on Ni(111) has been studied using a lattice gas model with pair interactions as long range as sixth neighbor. We discover three distinct (2y/3x2v/3)R 30 phases: low coverage (θ= 1/12), centered (θ = 1/6), and high coverage (θ= 1/4), when interactions are adjusted to match qualitatively the other features of the experimental phase diagram. Each pair of neighboring ordered phases is separated by a coexistence region at low temperatures. The low-coverage 2v3 phase disorders via a first-order transition at higher temperature. At higher coverage, a (v'lXV’DR 30 phase occurs at intermediate temperature. This phase melts by a first-order transition at low coverages and a continuous, three-state Potts transition at higher coverages. Thus, the simulations suggest that this chemisorbed system may provide an experimental realization of Potts tricritical behavior. Alternate sets of interactions in this long-range lattice gas model produce the (VIXV 1)R 19, (3x3), and (2x2) phases, which have been reported for other chemisorbed systems on triangular lattices.

UR - http://www.scopus.com/inward/record.url?scp=84957274291&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84957274291&partnerID=8YFLogxK

U2 - 10.1116/1.575949

DO - 10.1116/1.575949

M3 - Article

VL - 7

SP - 2158

EP - 2161

JO - Journal of Vacuum Science and Technology A

JF - Journal of Vacuum Science and Technology A

SN - 0734-2101

IS - 3

ER -