59 research outputs found
LOCAL PIEZOELECTRICITY IN SrTiO3-BiTiO3 CERAMICS
Local piezoelectric properties of Bi-doped SrTiO3 ceramics have been investigated by piezoresponse force microscopy. The appearance of both out-of-plane and in-plane polarization components confirmed the piezoelectric nature of the obtained signal. The absence of labyrinth-like structures in observed piezoelectric contrast is not consistent with the expected existence of a relaxor ferroelectric state in this material. The close similarity of local piezoelectric properties in Bi-doped SrTiO3 with pure SrTiO3 suggests that the origin of obtained piezoresponse can be attributed to the flexoelectric phenomenon. Bi-doping leads to occurrence of oxygen vacancies and negative charge on the surface of the sample
Coulomb gap in a model with finite charge transfer energy
The Coulomb gap in a donor-acceptor model with finite charge transfer energy
describing the electronic system on the dielectric side of the
metal-insulator transition is investigated by means of computer simulations on
two- and three-dimensional finite samples with a random distribution of equal
amounts of donor and acceptor sites. Rigorous relations reflecting the symmetry
of the model presented with respect to the exchange of donors and acceptors are
derived. In the immediate neighborhood of the Fermi energy the the
density of one-electron excitations is determined solely by
finite size effects and further away from is described by
an asymmetric power law with a non-universal exponent, depending on the
parameter .Comment: 10 pages, 6 figures, submitted to Phys. Rev.
Magnetic Stripes on Hexagonal Lattice with Competing Exchange and Dipole-Dipole Interactions
We obtained the phase diagram for the Ising model with competing exchange and dipolar interactions on 2D hexagonal lattice. By using histogram method we determined the order of the phase transition from isotropic stripe phase to low-temperature anisotropic stripe phases AFh of different stripe widths h. The first order phase transition was found to AF1 and AF2 phases and the second order - to AF3 and AF4 phases. We have also found that in AF1 phase stripe domain grows with time as . In phases AF3 and AF4 stripe domain growth is proportional to log t
Magnetic Stripes on Hexagonal Lattice with Competing Exchange and Dipole-Dipole Interactions
We obtained the phase diagram for the Ising model with competing exchange and dipolar interactions on 2D hexagonal lattice. By using histogram method we determined the order of the phase transition from isotropic stripe phase to low-temperature anisotropic stripe phases AFh of different stripe widths h. The first order phase transition was found to AF1 and AF2 phases and the second order -to AF3 and AF4 phases. We have also found that in AF1 phase stripe domain grows with time as t 0.5 . In phases AF3 and AF4 stripe domain growth is proportional to log t
Simulation of Reaction-Induced Phase Separation in Surface Alloy
Using kinetic Monte Carlo method we simulate the dynamics of biatomic surface alloy separation on Ni(111) due to out-reaction. The experiment of Vestergaard et al. is modeled by counterbalancing dynamical processes and interactions between reactants. The simulations demonstrate step flow rate increase with CO coverage, in qualitative agreement with the experiment only for ≲ 0.45 monolayer. Moreover, we demonstrate both CO influence on reaction process and Au domain formation
Magnetic Stripes on Hexagonal Lattice with Competing Exchange and Dipole-Dipole Interactions
We obtained the phase diagram for the Ising model with competing exchange and dipolar interactions on 2D hexagonal lattice. By using histogram method we determined the order of the phase transition from isotropic stripe phase to low-temperature anisotropic stripe phases AFh of different stripe widths h. The first order phase transition was found to AF1 and AF2 phases and the second order - to AF3 and AF4 phases. We have also found that in AF1 phase stripe domain grows with time as . In phases AF3 and AF4 stripe domain growth is proportional to log t
Simulation of Hydrogen-Induced Reconstruction of Oxygen on Pd(111)
The oxygen and hydrogen atoms co-adsorption experiment on Pd(111) is modelled using kinetic Monte Carlo method. We consider O-O, H-H, and O-H interactions and several kinetic processes (diffusion, surface and subsurface H-atoms exchange and water-formation reaction) leading to the phase transition → with increase in H-coverage. We also demonstrate how reverse phase transition → occurs due to hydrogen dissolution into subsurface in the absence of hydrogen gas. At higher temperature we observe the disappearance of oxygen islands due to water-formation reaction
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