TY - JOUR

T1 - Temperature-dependent domain-growth kinetics of orientationally ordered phases

T2 - Effects of annealed and quenched vacancies

AU - Mouritsen, Ole G.

PY - 1985

Y1 - 1985

N2 - The kinetics of domain growth in the orientationally ordered phases of a two-dimensional anisotropic-planar rotor model with vacancies is calculated by computer simulation of thermal quenches below the phase-transition temperature. The ground state of the model is a sixfold-degenerate herringbone structure in the absence of vacancies and a twofold- or eightfold-degenerate pinwheel structure in the presence of quenched or annealed vacancies. Quenches to zero and nonzero temperature are considered. The following aspects of domain-growth kinetics are studied: (i) freezing-in phenomena at zero temperature, (ii) temperature dependence of kinetic exponents, (iii) importance of soft and hard domain walls, (iv) relevance of the number of degenerate ground states, and (v) influence of quenched and annealed vacancies. Potential physical realizations of the model include N2 and mixtures of N2 and rare gases physisorbed on graphite. The results of the model simulations are discussed in relation to recent theories of domain-growth kinetics and compared with results of other model simulations as well as experimental studies of ordering processes in adsorbed molecular monolayers.

AB - The kinetics of domain growth in the orientationally ordered phases of a two-dimensional anisotropic-planar rotor model with vacancies is calculated by computer simulation of thermal quenches below the phase-transition temperature. The ground state of the model is a sixfold-degenerate herringbone structure in the absence of vacancies and a twofold- or eightfold-degenerate pinwheel structure in the presence of quenched or annealed vacancies. Quenches to zero and nonzero temperature are considered. The following aspects of domain-growth kinetics are studied: (i) freezing-in phenomena at zero temperature, (ii) temperature dependence of kinetic exponents, (iii) importance of soft and hard domain walls, (iv) relevance of the number of degenerate ground states, and (v) influence of quenched and annealed vacancies. Potential physical realizations of the model include N2 and mixtures of N2 and rare gases physisorbed on graphite. The results of the model simulations are discussed in relation to recent theories of domain-growth kinetics and compared with results of other model simulations as well as experimental studies of ordering processes in adsorbed molecular monolayers.

U2 - 10.1103/PhysRevB.32.1632

DO - 10.1103/PhysRevB.32.1632

M3 - Journal article

AN - SCOPUS:5544292360

VL - 32

SP - 1632

EP - 1638

JO - Physical Review B

JF - Physical Review B

SN - 2469-9950

IS - 3

ER -