4 research outputs found
The effect of the surface field on the phase diagrams of a transverse Ising thin film
Within an effective field theory (EFT), the phase diagrams of a transverse Ising thin film (TIM) has been investigated. The effects of the Ωs on the critical temperature are discussed by including the modification of surface exchange interaction. The phase diagrams are also determinated as function of the transverse field for different values of the film thickness n and for same value of ∆sWithin an effective field theory (EFT), the phase diagrams of a transverse Ising thin film (TIM) has been investigated. The effects of the Ωs on the critical temperature are discussed by including the modification of surface exchange interaction. The phase diagrams are also determinated as function of the transverse field for different values of the film thickness n and for same value of ∆
Ising-Like Model For Ferroelectric Phase Transitions In Tetragonal Tungsten Bronze Compounds
The two-component anisotropic Ising-like model was proposed to model the ferroelectric phase transitions in Tetragonal Tungsten Bronze (TTB) compounds. Using the mean-field approach we reconstructed the phase diagram of the TTB system and showed that depending on he relative strength of the interaction parameters there ferroelectric states are possible: (i) the state with y-directed polarization that corresponds to the tetragonal ferroelectric phase in TTB compounds, (ii) the state with x-directed polarization that corresponds to the orthorhombic TTB phase and (iii) Â the state with superposition of x- and y- polarization components that can correspond to the not yet discovered mixed phase.The two-component anisotropic Ising-like model was proposed to model the ferroelectric phase transitions in Tetragonal Tungsten Bronze (TTB) compounds. Using the mean-field approach we reconstructed the phase diagram of the TTB system and showed that depending on he relative strength of the interaction parameters there ferroelectric states are possible: (i) the state with y-directed polarization that corresponds to the tetragonal ferroelectric phase in TTB compounds, (ii) the state with x-directed polarization that corresponds to the orthorhombic TTB phase and (iii) Â the state with superposition of x- and y- polarization components that can correspond to the not yet discovered mixed phase
Phase diagrams of ferroelectric thin film with two surface layers
Phase diagram of a ferroelectric thin film with two surface layers is
studied in frame of the effective field theory (EFT) of transverse Ising
model (TIM). The surface of the system is formed from two layers
characterized by the exchange interaction anisotropy
and the transverse field .
The crossover from the ferroelectric phase (FP) to the paraelectric phase
(PP) is discussed. The phase diagram of the system is studied in coordinates as function
of the thickness parameter L. The special attention is given to the effect
of the transverse field on the phase transitions