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IJPAP Vol.47 [2009] >
IJPAP Vol.47(12) [December 2009] >
| Title: | Temperature and electric field dependence of soft mode frequency, dielectric constant and loss tangent in rochelle salt crystal |
| Authors: | Upadhyay, Trilok Chandra
Semwal, Kalika Prasad |
| Keywords: | Ferroelectrics
Green's function
Soft mode
Anharmonic interaction |
| Issue Date: | Dec-2009 |
| Publisher: | CSIR |
| Abstract: |
A two-sublattice pseudospin lattice coupled mode
model of Chaudhuri et al. [J Phys Soc Japan, 49 (1980) 609.]
along with third-and fourth-order phonon anharmonic interaction terms and
electric field term, has been considered.
By using double-time temperature dependent Green's function method, expressions
for shift, width, soft mode frequency, dielectric constant and loss tangent are
obtained for rochelle salt crystal. By fitting model values of physical
quantities, temperature dependence of soft mode frequency, dielectric constant
and loss tangent have been calculated for different
fields for rochelle salt. Theoretical results are seen to compare well with the
experimental results of Sandy and Jones
[Phys Rev, 168 (1968) 481].
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| Page(s): | 883-888 |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.47(12) [December 2009]
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