Temperature Dependence Of Polarizability Research Articles

Polarizability of electrically induced magnetic vortex “atoms”

Electric field control of magnetic structures, particularly topological defects in magnetoelectric materials, draws a great attention, which has led to experimental success in creation and manipulation of single magnetic defects, such as skyrmions and domain walls. In this work we explore a scenario of electric field creation of another type of topological defects – magnetic vortices and antivortices. Because of interaction of magnetic and electric subsystems each magnetic vortex (antivortex) in magnetoelectric materials possesses quantized magnetic charge, responsible for interaction between vortices, and electric charge that couples them to electric field. This property of magnetic vortices makes possible their creation by electric fields. We show that the electric field, created by a cantilever tip, produces a “magnetic atom” with a localized spot of ordered vortices (“nucleus” of the atom) surrounded by antivortices (“electronic shells”). We analytically find the vortex density distribution profile and temperature dependence of polarizability of this structure and confirm it numerically by Monte Carlo simulation.

Temperature Dependence of Polarizability in Sodium Potassium Tantalate Mixed Ceramic System

Using a quadratic anharmonic model Hamiltonian and using double time temperature dependent Green’s function method and Dyson’s equation treatment, expression for polarizability in the frequency response for mixed perovskite type ferroelectrics have been obtained. Using the experimentally observed temperature dependent dielectic constant, loss tangent, soft mode frequency, width for Na1-xKxTaO3 (x=0,0.2,0.4,0.5 and 0.6) the polarizability has been calculated for these samples at 10kHz

Temperature Dependence of Polarizability and Dispersion in Three, Two and One Dimensional Electron Gases

Both temperature dependence of polarizability and plasmon dispersion in unmagnetized metal (or semiconductor) electron gases are investigated in this paper. It is obtained that, with a continuous variation of temperature in a large region, the polarizability and dispersion change non-monotonously. The static polarizability χ(q, ω = 0, μ,T) and dispersion ωp(q, T) for finite T in three, two and one dimensional electron gases are calculated numerically. In addition, dispersion relation ω(q) at a definite temperature (T ≠ 0) is similar to that at T = 0.

Temperature Dependence of Polarizability of Diatomic Homonuclear Molecules

Temperature Dependence of Polarizability of Diatomic Homonuclear Molecules