Influence of uniaxial and hydrostatic pressures and shear stress $\sigma_{5}$ on the phase transition and thermodynamic properties of quasi-one-dimensional ferroelectrics of the CsH$_2$PO$_4$ type
Within the framework of the modified proton ordering model for the quasi-one-dimensional hydrogen bonded ferroelectrics of the CsH2PO4 type with taking into account the linear in the strains ε1, ε2, ε3, and ε5 contributions into the energy of the proton subsystem, without tunneling, using the two-particle cluster approximation, we study the influence of uniaxial pressures pi, hydrostatic pressure ph, and shear stress σ5 on the phase transition, polarization, transverse dielectric permittivity