As^<75> and Cs^<133> Quadrupole Interactions in Ferroelectric CsH_2AsO_4

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概要

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• Quadrupole coupling parameters of As^<75> and Cs^<133> have been studied in a single crystal of CsH_2AsO_4 (ferroelectric Curie point T_c=143°K). As^<75> resonance could not be observed below 153°K. The temperature coefficient of As^<75> quadrupole coupling constant exhibits an anomalous behaviour. Cs^<133> resonance was seen in the ferroelectric phase also. The average of the two EFG tensors corresponding to the two physically nonequivalent Cs-sites in the ferroelectric state is exactly equal to the EFG tensor in paraelectric phase. The EFG tensors in ferroelectric phase are diagonal in the crystal-fixed x(a), y(b) and z(c) frame of reference and therefore no further splitting was observed due to domain effects. These results have been discussed using the dynamic model of ferroelectricity of KH_2PO_4-type crystals in which proton tunneling motion is coupled with optical mode of [K-PO_4] lattice vibration.

• 社団法人日本物理学会の論文
• 1969-11-05

著者

• Gupta L.c.

  Tata Institute Of Fundamental Research

• Gupta L.

  Tata Institute Of Fundamental Research

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