Analysis of the Critical Magnetic Field and the Dielectric Susceptibility for the Smectic A-Smectic C* Transition in DOBAMBC

Date

2015-01-01

Author

Yurtseven, Hasan Hamit

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

49
views

0
downloads

The temperature dependences of the critical magnetic field H-c and the dielectric susceptibility x(at constant magnetic fields) are analyzed close to the smectic Asmectic C* transition in DOBAMBC using the experimental data according to a power-law formula. These analyses are performed below T-c in the smectic C* phase. Values of the critical exponent delta for the critical magnetic field are determined in a given temperature interval (Tc-T) with increasing and decreasing H-c. Also, values of the critical exponent gamma for the dielectric susceptibility x (dielectric constant) are determined in the two different temperature intervals (T-c-T) for constant magnetic fields ranging from 0 to 6 T. From our analysis of the temperature dependences of Hc and x, we extract the values of the critical exponent Phi to describe the magnetic field dependence of the dielectric susceptibility close to the AC* transition in DOBAMBC.

Subject Keywords

Critical magnetic field, Dielectric susceptibility (dielectric constant), Smectic A-smectic C* transition, DOBAMBC

URI

https://hdl.handle.net/11511/40042

Journal

FERROELECTRICS

DOI

https://doi.org/10.1080/00150193.2015.1100031

Collections

Department of Physics, Article

Suggestions

OpenMETU
Core

A First-Order Transition of the Smectic A-Smectic C* in Ferroelectric Liquid Crystals Kilit, E.; Yurtseven, Hasan Hamit (2012-01-01) The static dielectric constant is calculated as a function of temperature using a mean field model close to the smectic A-smectic C* transition for the ferroelectric liquid crystal 4-(3-methyl-2-chlorobutanoyloxy)-4'-heptyloxybiphenyl (A7). This calculation of the dielectric constant is performed for the pure optically active compound (T-c = 73.4 degrees C) and the temperature range is determined for a first-order smectic A-smectic C* transition from the mean field model. Our predicted values describe adequ...
Analysis of the Spontaneous Polarization and the Dielectric Constant Near the Ferroelectric Phase Transition in TSCC Yurtseven, Hasan Hamit (Informa UK Limited, 2008-01-01) The temperature dependence of the spontaneous polarization and the dielectric constant has been analyzed for the fixed pressures of 0.001,1 and 2.2 kbar close to the phase transitions in TSCC. This analysis is performed using the experimental data for TSCC according to a power-law formula. From our analysis, using the experimental data for the spontaneous polarization, we deduce the values of the critical exponent = 0.32 (1 bar), 0.28 (1 kbar) and 0.26 (2.2 kbar) for the spontaneous polarization near the tr...
Calculation of the Dielectric Constant of a Ferroelectric Liquid Crystal From a Mean Field Model YURTSEVEN, HASAN HAMİT; Yurtseven, Hasan Hamit (2011-01-01) The static dielectric constant epsilon(perpendicular to) of the ferroelectric liquid crystal 4-(3-methyl-2-chlorobutanoyloxy)-4'--heptyloxybiphenyl (A7) with high spontaneous polarization is calculated as a function of temperature using a mean field model. This calculation is performed close to the smectic A-isotropic liquid (SmA-I) transition for pure optically active compound (T-c = 81.6 degrees C). For this calculation of epsilon(perpendicular to), the free energy of the SmA phase is expanded in terms of...
Analysis of the Magnetization as a Function of the Magnetic Field at the Transition Temperature for La0.6Nd0.4Mn2Si2 Yurtseven, Hasan Hamit; Emre, B.; Acet, M. (2015-03-01) We analyze in this study our experimental data for the magnetization (M) as a function of the magnetic field (H) at various constant temperatures for the multilayer structure of La Nd-0.6 Mn-0.4 Si-2 (2) close to the ferromagnetic-antiferromagnetic transitions. This analysis is performed at the transition temperatures (T (c)) for the M vs. H- H (c) (H (c) is the critical field) according to a power-law formula above and below H (c), and the values of the critical isotherm delta are deduced for La Nd-0.6 Mn-...
Analysis of the Specific Heat for the Transitions of the Phases I-II-III-IV in (N(CH3)(4))(2)CUCl4 Crystal Yurtseven, Hasan Hamit (2008-01-01) The temperature dependence of the specific heat C-p is analyzed here using the experimental data according to a power-law formula with the critical exponent a for the transitions of commensurate (I), incommensurate (II) and the ferroelastic (III and IV) phases in (N(CH3)(4))(2)CUCl4 crystal. From our analysis, we extract the value of a approximate to 0 above and below T-c for the successive phase transitions of which is expected from the mean field theory (alpha =0 discontinuity), XY model (alpha =0 log) an...

Citation Formats

H. H. Yurtseven, “Analysis of the Critical Magnetic Field and the Dielectric Susceptibility for the Smectic A-Smectic C* Transition in DOBAMBC,” FERROELECTRICS, pp. 66–73, 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/40042.