Dielectric properties of KDP-type ferroelectric crystals in the presence of external electric field |
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Authors: | Trilok Chandra Upadhyay Ramendra Singh Bhandari Birendra Singh Semwal |
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Institution: | (1) Physics Department, H.N.B. Garhwal University, Srinagar (Garhwal), 246 174 Uttaranchal, India |
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Abstract: | Considering external electric field as well as third- and fourth-order phonon anharmonic interaction terms in the pseudospin-lattice
coupled mode (PLCM) model Hamiltonian for KDP-type ferroelectrics, expressions for field-dependent shift, width, renormalized
soft mode frequency, Curie temperature, dielectric constant and dielectric loss are evaluated. For the calculation, method
of statistical double-time temperature-dependent Green’s function has been used. By fitting model values of physical quantities,
temperature and electric field dependences of soft mode frequency, dielectric constant and loss have been calculated which
compare well with experimental results of Baumgartner 8] and Choi and Lockwood 9]. Both dielectric constant and loss decrease
with electric field. |
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Keywords: | Ferroelectrics psendospin soft mode Green’ s function dielectric constant tangent loss |
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