Analysis of Phonon-Tunneling Modes in the Raman Spectrum of Tetragonal KH_2PO_4

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概要

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• With a view to analyzing recent room temperature Raman measurements by Lavrencic et al. on KH_2PO_4, an earlier treatment of a generalized Kobayashi model is extended to the paraelectric phase. This model couples one optic phonon branch to each of four branches of the excitations determined by tunneling of protons. The frequencies of these coupled modes calculated by the equation-of-motion method are shown to obey sum rules which lead to the interpretation of for of the Raman lines as resulting from the coupling of modes of B_2 and E symmetry, and one other B_1 line as doubtful but possibly a peak in the second-order spectrum. The sum rules also provide upper and lower bounds on the tunneling integral T, which is estimated to be ∼314cm^<-1>. It is shown that if long-range interproton interactions are weak, the ferroelectric B_2 mode should soften as T→T_c+, whereas if long-range interactions are strong, there may be little appreciable softening.

• 社団法人日本物理学会の論文
• 1972-09-05

著者

• Nettleton R.

  Department Of Physics And Astronomy University Of Kentucky

• Nettleton R.E.

  Department of Physics and Astronomy, University of Kentucky

関連論文

• Analysis of Phonon-Tunneling Modes in the Raman Spectrum of Tetragonal KH_2PO_4
• Evaluation of Correlations Defining Coefficients in NON-Equilibrium Thermodynamics

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