6533b871fe1ef96bd12d0d6c
RESEARCH PRODUCT
Observation of random-field behavior in (CO)1−x(N2)xmixtures physisorbed on graphite
Stefan-alexander ArltH. Wiechertsubject
Phase transitionCrystallographyMaterials scienceRandom fieldSpecific heatGeneral Physics and AstronomyPhysical chemistryIsing modelGraphiteRenormalization groupHeat capacitySolid solutiondescription
Heat-capacity studies have been carried out on submonolayers of (CO${)}_{1\mathrm{\ensuremath{-}}\mathit{x}}$(${\mathrm{N}}_{2}$${)}_{\mathit{x}}$ mixtures physisorbed on graphite. We find that pure CO undergoes an end-to-end ordering transition at ${\mathit{T}}_{\mathit{c}}$=5.18 K, which is shown to belong to the two-dimensional Ising universality class. In diluting CO with ${\mathrm{N}}_{2}$ the heat-capacity peaks become progressively rounded until the phase transition is completely suppressed at a ${\mathrm{N}}_{2}$ concentration of only x=0.07. The analysis of the data shows that this behavior is in quantitative agreement with predictions of the random-field theory applied to adsorbed films.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1993-09-27 | Physical Review Letters |