265 citations · 3.7k across the 158 of their papers we have counts for
51 papers · 1 filter
Multicritical Bifurcation and First-order Phase Transitions in a Three-dimensional Blume-Capel Antiferromagnet
Daniel Silva, Gloria M. Buendia, Per Arne Rikvold
We present a detailed study by Monte Carlo simulations and finite-size scaling analysis of the phase diagram and ordered bulk phases for the three-dimensional Blume-Capel antiferro…
Complete catalog of ground-state diagrams for the general three-state lattice-gas model with nearest-neighbor interactions on a square lattice
Daniel Silva, Per Arne Rikvold
The ground states of the general three-state lattice-gas (equivalently, Ising) model with nearest-neighbor interactions on a square lattice are explored in the full, five-dim…
Multistability in an unusual phase diagram induced by the competition between antiferromagnetic-like short-range and ferromagnetic-like long-range interactions
Masamichi Nishino, Per Arne Rikvold, Conor Omand +1
The interplay between competing short-range (SR) and long-range (LR) interactions can cause nontrivial structures in phase diagrams. Recently, horn-shaped unusual structures were f…
Nontrivial phase diagram for an elastic interaction model of spin crossover materials with antiferromagnetic-like short-range interactions
Masamichi Nishino, Seiji Miyashita, Per Arne Rikvold
We study the phase diagram of an elastic interaction model for spin crossover (SC) materials with antiferromagnetic-like short-range interactions. In this model, the interplay betw…
Density of states for systems with multiple order parameters: a constrained Wang-Landau method
Chor-Hoi Chan, Gregory Brown, Per Arne Rikvold
A macroscopically constrained Wang-Landau Monte Carlo method was recently proposed to calculate the joint density of states (DOS) for systems with multiple order parameters. Here w…
Macroscopically constrained Wang-Landau method for systems with multiple order parameters and its application to drawing complex phase diagrams
Chor-Hoi Chan, Gregory Brown, Per Arne Rikvold
A generalized approach to Wang-Landau simulations, macroscopically constrained Wang-Landau, is proposed to simulate the density of states of a system with multiple macroscopic orde…
Monte Carlo Studies of the Ising Antiferromagnet with a Ferromagnetic Mean-field Term
Gregory Brown, Per Arne Rikvold, Seiji Miyashita
The unusual thermodynamic properties of the Ising antiferromagnet supplemented with a ferromagnetic, mean-field term are outlined. This simple model is inspired by more realistic m…
A model for the catalytic oxidation of CO that includes CO desorption and diffusion, O repulsion, and impurities in the gas phase
Gloria Buendía, Per Arne Rikvold
We present kinetic Monte Carlo simulations exploring the nonequilibrium phase diagram of a modified Ziff-Gulari-Barshad (ZGB) dynamic lattice-gas model for the catalytic oxidation…
Phase separation on a hyperbolic lattice
Jesse Raffield, Howard L. Richards, James Molchanoff +1
We report a preliminary numerical study by kinetic Monte Carlo simulation of the dynamics of phase separation following a quench from high to low temperature in a system with a sin…
Macroscopic nucleation phenomena in continuum media with long-range interactions
Masamichi Nishino, Cristian Enachescu, Seiji Miyashita +3
Nucleation, commonly associated with discontinuous transformations between metastable and stable phases, is crucial in fields as diverse as atmospheric science and nanoscale electr…
Critical temperature and correlation length of an elastic interaction model for spin-crossover materials
Taro Nakada, Takashi Mori, Seiji Miyashita +4
It has previously been pointed out that the coexistence of infinite-range and short-range interactions causes a system to have a phase transition of the mean-field universality cla…
Crossover between a Short-range and a Long-range Ising model
Taro Nakada, Per Arne Rikvold, Takashi Mori +2
Recently, it has been found that an effective long-range interaction is realized among local bistable variables (spins) in systems where the elastic interaction causes ordering of…
Asymptotic forms and scaling properties of the relaxation time near threshold points in spinodal-type dynamical phase transitions
Takashi Mori, Seiji Miyashita, Per Arne Rikvold
We study critical properties of the relaxation time at a threshold point in switching processes between bistable states under change of external fields. In particular, we investiga…
Effect of CO desorption and coadsorption with O on the phase diagram of a Ziff-Gulari-Barshad model for the catalytic oxidation of CO
G. M. Buendia, E. Machado, P. A. Rikvold
We study the effect of coadsorption of CO and O on a Ziff-Gulari-Barshad (ZGB) model with CO desorption (ZGB-d) for the reaction CO + O --> CO_2 on a catalytic surface. Coadsorptio…
Threshold Phenomena under Photo Excitation of Spin-crossover Materials with Cooperativity due to Elastic Interactions
Seiji Miyashita, Per Arne Rikvold, Takashi Mori +3
Photo-induced switching from the low-spin state to the high-spin state is studied in a model of spin-crossover materials, in which long-range interactions are induced by elastic di…
Scaling properties of the relaxation time near the mean-field spinodal
Takashi Mori, Seiji Miyashita, Per Arne Rikvold
We study the relaxation processes of the infinitely long-range interaction model (the Husimi-Temperley model) near the spinodal point. We propose a unified finite-size scaling func…
Dynamic phase transition in the two-dimensional kinetic Ising model in an oscillating field: Universality with respect to the stochastic dynamic
Gloria M. Buendia, Per Arne Rikvold
We study the dynamical response of a two-dimensional Ising model subject to a square-wave oscillating external field. In contrast to earlier studies, the system evolves under a so-…
Evidence for a dynamic phase transition in [Co/Pt]_3 magnetic multilayers
D. T. Robb, Y. H. Xu, O. Hellwig +4
A dynamic phase transition (DPT) with respect to the period P of an applied alternating magnetic field has been observed previously in numerical simulations of magnetic systems. Ho…
Two Modes of Magnetization Switching in a Simulated Iron Nanopillar in an Obliquely Oriented Field
S. H. Thompson, G. Brown, P. A. Rikvold +1
Finite-temperature micromagnetics simulations are employed to study the magnetization-switching dynamics driven by a field applied at an angle to the long axis of an iron nanopilla…
Nanostructure and velocity of field-driven solid-on-solid interfaces moving under a phonon-assisted dynamic
G. M Buendia, P. A. Rikvold, M. Kolesik +2
The nanoscopic structure and the stationary propagation velocity of (1+1)-dimensional solid-on-solid interfaces in an Ising lattice-gas model, which are driven far from equilibrium…
Network Growth with Preferential Attachment for High Indegree and Low Outdegree
Volkan Sevim, Per Arne Rikvold
We study the growth of a directed transportation network, such as a food web, in which links carry resources. We propose a growth process in which new nodes (or species) preferenti…
Conjugate field and fluctuation-dissipation relation for the dynamic phase transition in the two-dimensional kinetic Ising model
D. T. Robb, P. A. Rikvold, A. Berger +1
The two-dimensional kinetic Ising model, when exposed to an oscillating applied magnetic field, has been shown to exhibit a nonequilibrium, second-order dynamic phase transition (D…
Effects of Preference for Attachment to Low-degree Nodes on the Degree Distributions of a Growing Directed Network and a Simple Food-Web Model
Volkan Sevim, Per Arne Rikvold
We study the growth of a directed network, in which the growth is constrained by the cost of adding links to the existing nodes. We propose a new preferential-attachment scheme, in…
Decay of metastable phases in a model for the catalytic oxidation of CO
E. Machado, G. M. Buendia, P. A. Rikvold
We study by kinetic Monte Carlo simulations the dynamic behavior of a Ziff-Gulari-Barshad model with CO desorption for the reaction CO + O CO on a catalytic surface. Fini…