Measurement of the soft polariton in KTa[sub 0. 93]Nb[sub 0. 07]O[sub 3] by time-resolved four-wave mixing

Journal Article · Thu Dec 01 00:00:00 EST 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.50.16295· OSTI ID:6995361

Grenier, P ^[1]; Houde, D ^[2]; Jandl, S ^[1]; Boatner, L A ^[3]

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1. Departement de Physique, Universite de Sherbrooke, Sherbrooke, Quebec, J1K 2R1 (Canada)
2. Departement de Medecine Nucleaire et de Radiobiologie, Universite de Sherbrooke, Sherbrooke, Quebec, J1K 2R1 (Canada)
3. Solid State Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6056 (United States)

Measurement of the [ital A][sub 1](TO) soft-polariton mode in KTa[sub 0.93]Nb[sub 0.07]O[sub 3] has been made as a function of wave vector and temperature by means of a time-resolved third-order optical susceptibility technique. With the use of a polariton model calculation, the [ital A][sub 1](TO) soft-phonon mode self-energy wave-vector dependence, the Raman tensor, and the electro-optic tensor are inferred. The results indicate the particularity of the soft-phonon mode dynamics in the polariton region. The soft-phonon self-energy shows the presence of a four-particle interaction relaxation process and of an additional relaxation process associated with the intercluster dynamics, while the Raman and electro-optic tensor behavior as a function of temperature indicates the predominance of the electromagnetic interaction in the soft-phonon mode dynamics close to [ital T][sub [ital c]].

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6995361
• Journal Information: Physical Review, B: Condensed Matter; (United States), Vol. 50:22; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
NIOBIUM OXIDES
QUASI PARTICLES
POTASSIUM OXIDES
TANTALUM OXIDES
DISPERSION RELATIONS
ELECTRO-OPTICAL EFFECTS
RAMAN EFFECT
TEMPERATURE DEPENDENCE
ALKALI METAL COMPOUNDS
CHALCOGENIDES
NIOBIUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
REFRACTORY METAL COMPOUNDS
TANTALUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360606* - Other Materials- Physical Properties- (1992-)