I. Gregora

Orbital angular momentum impact on light scattering by phonons tested experimentally

Anastasiia Pylypets, Fedir Borodavka, I. Rafalovskyi, I. Gregora et autres

Polarized Raman spectra of piezoelectric bismuth germanate single crystal were recorded using vortex light in order to verify the predicted symmetry selection rules for Raman scattering of photons with nonzero orbital angular momentum. First, the phonon spectrum is fully characterized by the …

cz (code pays fourni par la source)

Enhancing thermoelectric properties of ScN films through twin domains

Joris More-Chevalier, Urszula Danuta Wdowik, J. Martan, Tetsuya Baba et autres

Tailoring thermoelectric properties of ScN-based materials is of vital importance for their application, particularly at high operating temperatures. Here, we report on the thermoelectric properties of the ScN layers deposited on MgO (001) substrates by the DC reactive magnetron sputtering. The microstructure …

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Effect of oxygen defects on microstructure, optical and vibrational properties of ScN films deposited on MgO substrate from experiment and first principles

Joris More-Chevalier, Urszula Danuta Wdowik, Dominik Legut, Stanislav Cichoň et autres

cz (code pays fourni par la source)

New perspectives for heavily boron-doped diamond Raman spectrum analysis

Vincent Mortet, I. Gregora, Andrew J. Taylor, Nicolas LAMBERT et autres

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High‐Temperature PIN Diodes Based on Amorphous Hydrogenated Silicon‐Carbon Alloys and Boron‐Doped Diamond Thin Films

The Ha Stuchlíková, Jiří Stuchlík, Zdenek Remes, Andrew J. Taylor et autres

Amorphous SiC:H (a‐SiC:H) diode structures with different ratios of Si:C are deposited on transparent conductive boron‐doped diamond‐coated fused silica substrates by plasma‐enhanced chemical vapor deposition. The boron‐doped diamond thin films have been deposited at temperature 720 °C on the fused silica substrates …

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Optical Contrast and Raman Spectroscopy Techniques Applied to Few-Layer 2D Hexagonal Boron Nitride

Marie Kreĉmarová, Daniel Andres‐Penares, Ladislav Fekete, Petr Ashcheulov et autres

The successful integration of few-layer thick hexagonal boron nitride (hBN) into devices based on two-dimensional materials requires fast and non-destructive techniques to quantify their thickness. Optical contrast methods and Raman spectroscopy have been widely used to estimate the thickness of two-dimensional semiconductors …

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Raman scattering yields cubic crystal grain orientation

Karel Tesař, I. Gregora, P. Bérešová, P. Vaněk et autres

Abstract The paper proposes a fully optical method for determination of a cubic crystal grain orientation in a sample inspected by a Raman microscope. The method is based on a universal and strong polarisation anisotropy of the Raman scattering by doubly degenerate …

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Vibrational modes and overlap matrix of LiNb1−xTaxO3 mixed crystals

Ausrine Bartasyte, Samuel H. Margueron, A. Michael Glazer, E. Simon et autres

The wave numbers and efficiencies of the first-order lattice vibrational modes of the isomorphous solid solutions of $\mathrm{LiNb}{\mathrm{O}}_{3}\text{\ensuremath{-}}\mathrm{LiTa}{\mathrm{O}}_{3}$ have been studied by Raman and infrared spectroscopies. The substitution of niobium by tantalum induces a continuous shift of wave numbers and intensities of …

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Lattice dynamics and domain wall oscillations of morphotropic Pb(Zr,Ti)O3 ceramics

E. Buixaderas, Viktor Bovtun, Martin Kempa, D. Nuzhnyy et autres

The temperature dependence of the optical phonons and high-frequency microwave excitations of morphotropic $\mathrm{Pb}(\mathrm{Z}{\mathrm{r}}_{1\ensuremath{-}x}\mathrm{T}{\mathrm{i}}_{x}){\mathrm{O}}_{3}$ (PZT) ceramics with compositions PZT 52/48 and 53/47 were studied by a broadband spectroscopy approach, using Raman, far-infrared, time-domain terahertz (THz), and microwave spectroscopies. A careful evaluation of …

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Lattice modes and the Jahn-Teller ferroelectric transition of GaV4S8

J. Hlinka, Fedir Borodavka, I. Rafalovskyi, Z. Dočekalová et autres

Crystal of ${\mathrm{GaV}}_{4}{\mathrm{S}}_{8}$, a multiferroic system hosting a N\'eel-type skyrmion lattice phase, has been investigated by polarized Raman and IR spectroscopy above and below the ferroelectric phase transition. Counts of the observed IR and Raman-active modes belonging to distinct irreducible representations agree …

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Electric-field-induced tetragonal phase in [Pb(Mg1/3Nb2/3)O3]0.68–[PbTiO3]0.32 by Raman scattering

I. Rafalovskyi, I. Gregora, J. Hlinka

The paper describes investigation of the electric-field-induced phase transition in PMN-xPT single crystals with x = 0.32 by means of detailed polarized Raman scattering measurements. Field-induced tetragonal state was reached by applying an electric field up to 30 kV/cm along pseudo-cubic direction …

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Macroscopic lamellar heterophase pattern in Pb(Mg1/3Nb2/3)O3−PbTiO3 single crystals

I. Rafalovskyi, Mael Guennou, I. Gregora, J. Hlinka

The paper describes lamellar heterostructures, observed in $(1\ensuremath{-}x)\text{Pb}({\mathrm{Mg}}_{1/3}{\mathrm{Nb}}_{2/3}){\mathrm{O}}_{3}\text{\ensuremath{-}}x{\mathrm{PbTiO}}_{3}$ (PMN-$x\text{PT}$) single crystals with $x=0.32$. These lamellas are naturally formed in single crystals cooled under bias electric field applied along $[001{\mathrm{]}}_{\mathrm{pc}}$ and then zero-field heated to the vicinity of the so-called depoling temperature ${T}_{\mathrm{RT}}$, …

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