Infrared and Raman responses in ferroelectric perovskite crystals: Apparent inconsistencies

Servoin, J. L.; Gervais, F.; Quittet, A. M.; Luspin, Y.

doi:10.1103/physrevb.21.2038

Cited by 90 publications

(58 citation statements)

References 15 publications

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“…Magnitudes of the (T) maximums appeared to be larger that those in KNO in the vicinity of cubic-tetragonal PT (~ 4500) and nearly the same for tetragonal-orthorhombic one [13]. which are split by symmetry change due to phase transitions [14]. As result at room temperature KLN-2 is in the orthorhombic phase and has three IR …”

Section: Results Uand Discussionmentioning

confidence: 81%

Li doping effect on properties and phase transfomations of KNbO3

Трепаков

Savinov

Železný

et al. 2007

Journal of the European Ceramic Society

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Section: Results Uand Discussionmentioning

confidence: 81%

Li doping effect on properties and phase transfomations of KNbO3

Трепаков

Savinov

Železný

et al. 2007

Journal of the European Ceramic Society

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“…BTO shows a phonon resonance 25 around 20 µm resulting in superlensing close to λ SL = 16.5 µm when considered free standing in air. Here, the superlensing condition 13,14 Re(ε SL ) = -Re(ε air ) = -1 is met as indicated in Fig.…”

mentioning

confidence: 99%

A Local Superlens

et al. 2015

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Superlenses enable near-field imaging beyond the optical diffraction limit. However, their widespread implementation in optical imaging technology so far has been limited by large-scale fabrication, fixed lens position, and specific object materials. Here we demonstrate that a dielectric lamella of subwavelength size in all three spatial dimensions behaves as a compact superlens that operates at infrared wavelengths and can be positioned to image any local microscopic area of interest on the sample. In particular, the lamella superlens may be placed in contact with any type of object and therefore enables examination of hard-to-scan samples, for example, with high topography or in liquids, without altering the specimen design. This lamella-based local superlens design is directly applicable to subwavelength light-based technology, such as integrated optics.

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“…This is because the E-polarized soft mode in bulk BTO has a very strong oscillator strength and is overdamped 51 . Its parameters, therefore, can be hardly determined even for a bulk sample.…”

Section: Infrared Spectroscopy Of the (Bto)8/(sto)4 Superlatticementioning

confidence: 99%

“…Our BTO/STO superlattices serves as a good example. Knowing Servion's data for bulk BTO 51 and STO 52 we can make mode assignments. The highest frequency, TO4, modes are found at 485 cm −1 for BTO and 545 cm −1 for STO in pure bulk compounds.…”

Section: Infrared Spectroscopy Of the (Bto)8/(sto)4 Superlatticementioning

confidence: 99%

Temperature-dependent far-infrared reflectance of an epitaxial (BaTiO3)8/(SrTiO3)4 superlattice

et al. 2017

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Infrared reflectance spectra of the polar optic phonons in a [(BaTiO3)8/(SrTiO3)4]50 superlattice over the temperature range 8 to 650 K are reported. The spectra exhibit lattice vibration features typical of the perovskite constituents, BaTiO3 and SrTiO3. Using the effective medium approximation for multilayers systems and a fitting procedure, we were able to successfully simulate the infrared reflectivity of the superlattice structures and extract the parameters and dielectric functions of the phonons. When applied at varying temperatures, this approach provides the parameters of the zone-center polar phonons and their temperature dependence. Comparing these results with x-ray diffraction we identified some anomalies in phonon behavior related to the phase transitions that the superlattice undergoes.

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Infrared and Raman responses in ferroelectric perovskite crystals: Apparent inconsistencies

Cited by 90 publications

References 15 publications

Li doping effect on properties and phase transfomations of KNbO3

Li doping effect on properties and phase transfomations of KNbO3

A Local Superlens

Temperature-dependent far-infrared reflectance of an epitaxial (BaTiO3)8/(SrTiO3)4 superlattice

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