Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/4082
Title: Field dependent soft mode frequency in Ba<sub>x</sub>Sr<sub>1-x</sub>TiO<sub>3 </sub>ferroelectric perovskites
Authors: Kumar, Ashok
Kukreti, Ashish
Naithani, U C
Keywords: Soft mode frequency
Ferroelectric perovskites
Green’s function
Anharmonicity
Issue Date: Apr-2009
Publisher: CSIR
Abstract: An expression has been obtained for the soft mode frequency in Ba<sub>x</sub>Sr<sub>1-x</sub>TiO<sub>3</sub> ferroelectric perovskites in the presence of external electric field, by using double time temperature dependent Green’s function technique. The mass and force constant change due to impurity atoms which are taken into account in the presence of higher order anharmonic and electric moment terms in the Silverman Joseph Hamiltonian. The soft mode frequency is obtained in the presence of both the electric field and impurity of Ba in an anharmonic SrTiO<sub>3</sub> ferroelectric perovskites. The soft mode frequency decreases with increase of impurity concentration of Ba in pure SrTiO<sub>3 </sub>. The soft mode frequency also increases with increase of external electric field in Ba<sub>X</sub>Sr<sub>1-X</sub>TiO<sub>3</sub> ferroelectric perovskites.<b></b>
Description: 300-305
URI: http://hdl.handle.net/123456789/4082
ISSN: 0019-5596
Appears in Collections:IJPAP Vol.47(04) [April 2009]

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