On the drastic temperature broadening of hard mode Raman lines of ferroelectric KDP type crystals near Tc

I. Laulicht

doi:10.1016/0022-3697(78)90153-1

On the drastic temperature broadening of hard mode Raman lines of ferroelectric KDP type crystals near Tc

I. Laulicht

Department of Physics - at Bar-Ilan University

Research output: Contribution to journal › Article › peer-review

55 Scopus citations

Abstract

The drastic broadening of a few A₁ Raman lines of ferroelectric KH₂PO₄(KDP) and KH₂AsO₄(KDA) crystals have been measured at various temperatures near T_c. The results in KDP are in fair agreement with two different simplified expressions of linewidths, which are based on pseudospin-phonon interaction arguments. No such agreement is found between the results and a simplified linewidth expression derived from a theory based on soft mode-hard mode interaction arguments. The linewidths and the reciprocal of the proton spin-lattice relaxation time in KDP exhibit a very similar temperature dependence below T_c but behave differently above T_c. This phenomena is presented in detail, and discussed.

Original language	English
Pages (from-to)	901-906
Number of pages	6
Journal	Journal of Physics and Chemistry of Solids
Volume	39
Issue number	8
DOIs	https://doi.org/10.1016/0022-3697(78)90153-1
State	Published - 1978

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10.1016/0022-3697(78)90153-1

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title = "On the drastic temperature broadening of hard mode Raman lines of ferroelectric KDP type crystals near Tc",

abstract = "The drastic broadening of a few A1 Raman lines of ferroelectric KH2PO4(KDP) and KH2AsO4(KDA) crystals have been measured at various temperatures near Tc. The results in KDP are in fair agreement with two different simplified expressions of linewidths, which are based on pseudospin-phonon interaction arguments. No such agreement is found between the results and a simplified linewidth expression derived from a theory based on soft mode-hard mode interaction arguments. The linewidths and the reciprocal of the proton spin-lattice relaxation time in KDP exhibit a very similar temperature dependence below Tc but behave differently above Tc. This phenomena is presented in detail, and discussed.",

author = "I. Laulicht",

year = "1978",

doi = "10.1016/0022-3697(78)90153-1",

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journal = "Journal of Physics and Chemistry of Solids",

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AU - Laulicht, I.

PY - 1978

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N2 - The drastic broadening of a few A1 Raman lines of ferroelectric KH2PO4(KDP) and KH2AsO4(KDA) crystals have been measured at various temperatures near Tc. The results in KDP are in fair agreement with two different simplified expressions of linewidths, which are based on pseudospin-phonon interaction arguments. No such agreement is found between the results and a simplified linewidth expression derived from a theory based on soft mode-hard mode interaction arguments. The linewidths and the reciprocal of the proton spin-lattice relaxation time in KDP exhibit a very similar temperature dependence below Tc but behave differently above Tc. This phenomena is presented in detail, and discussed.

AB - The drastic broadening of a few A1 Raman lines of ferroelectric KH2PO4(KDP) and KH2AsO4(KDA) crystals have been measured at various temperatures near Tc. The results in KDP are in fair agreement with two different simplified expressions of linewidths, which are based on pseudospin-phonon interaction arguments. No such agreement is found between the results and a simplified linewidth expression derived from a theory based on soft mode-hard mode interaction arguments. The linewidths and the reciprocal of the proton spin-lattice relaxation time in KDP exhibit a very similar temperature dependence below Tc but behave differently above Tc. This phenomena is presented in detail, and discussed.

UR - https://www.scopus.com/pages/publications/0017920611

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JO - Journal of Physics and Chemistry of Solids

JF - Journal of Physics and Chemistry of Solids

IS - 8

ER -

On the drastic temperature broadening of hard mode Raman lines of ferroelectric KDP type crystals near Tc

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