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

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.