Neutron scattering study of lattice dynamics and diffuse scattering in relaxor KLT

Wakimoto, Shuichi ; Samara, G. A.*; Grubbs, R. K.*; Venturini, E. L.*; Boatner, L. A.*; Xu, G. Y.*; Shirane, Gen*; Lee, S.-H.*

Neutron scattering has been performed on relaxor K $_{1-x}$ Li $_{x}$ TaO $_{3}$ (KLT) single crystals to study phonon and duffuse scattering. Dielectric measurements show that the sample has only relaxor state down the base temperature while the sample has a clear ferroelectric transition at K below which the system still shows relaxation of Li ions. Neutron scattering results demonstrate that the transiverse optic ferrolectric mode softens gradually with decreasing temperature for the former sample. On the other hand, the latter sample exhibits small hardening of the TO mode at Tc and then softens below Tc. These facts imply that the TO mode plays an important role in addition to the Li relaxation.

Language	:	Japanese
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Meeting title	:	日本物理学会2007年春季大会(物性)
Held date	:	2007/03
Location (city)	:	鹿児島
Location (country)	:	日本
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Keywords	:	no keyword
Research Facility	:	JRR-3M(研究炉3)
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Registration No. : BB20063288
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