X-ray diffraction on the X-cut of a Ca3TaGa3Si2O14 single crystal modulated by a surface acoustic wave

Иржак, Д. В.; Рощупкин, Д. В.

doi:10.1063/1.4884875

Cited by 11 publications

(5 citation statements)

References 11 publications

(17 reference statements)

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“…Subsequently we observe oscillations of the diffracted intensity with a period of T SAW = 1310 ps. Due to the short x-ray penetration depth in our surface diffraction experiment, we rely on kinematic theory [31][32][33][34] and find the following expression for the diffracted intensity from a PSE under grazing incidence below the critical angle α i < α c :…”

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confidence: 99%

Spatiotemporal Coherent Control of Thermal Excitations in Solids

et al. 2017

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X-ray reflectivity (XRR) measurements of femtosecond laser-induced transient gratings (TG) are applied to demonstrate the spatio-temporal coherent control of thermally induced surface deformations on ultrafast timescales. Using grazing incidence x-ray diffraction we unambiguously measure the amplitude of transient surface deformations with sub-Å resolution. Understanding the dynamics of femtosecond TG excitations in terms of superposition of acoustic and thermal gratings makes it possible to develop new ways of coherent control in x-ray diffraction experiments. Being the dominant source of TG signal, the long-living thermal grating with spatial period Λ can be canceled by a second, time-delayed TG excitation shifted by Λ/2. The ultimate speed limits of such an ultrafast x-ray shutter are inferred from the detailed analysis of thermal and acoustic dynamics in TG experiments. [5][6][7] or plasmonic [8,9] degrees of freedom. Strain-induced phenomena may be used to discover new material properties and develop new applications, for example the modification of optical and electronic properties in semiconductor nanostructures [10]. Surface acoustic waves (SAWs) are often employed as a source of lattice strain. They can be generated [11] and controlled [12] optically via the excitation of transient gratings (TGs) [13,14]. Recently, these TG-excitations heave been used to probe heat transport in suspended thin films [15] and magneto-elastic coupling in thin nickel films [16][17][18]. Optical excitation of a solid generates not only coherent sound waves but also incoherent thermal strain. Coherent excitations can be controlled in amplitude and phase by series of light pulses in time domain, which is labeled temporal coherent control [19]. The main fraction of the deposited optical energy is stored in incoherent excitations of the lattice, i.e., heat [20,21] which can consequently not be controlled by a temporal sequence of light pulses. This thermal lattice excitation often generates a background which makes is difficult to precisely observe the coherent acoustic signal in purely optical experiments.In this letter we demonstrate, for the first time, the coherent control of incoherent, thermal transient gratings. We apply spatio-temporal coherent control showing that the spatial part of coherent control adds a new degree of freedom to control the amplitude and the phase of a thermally deformed surface. This is clearly a new approach that introduces the concept of spatial coherent control to the dynamics of incoherent excitations on ultrafast time scales, a phenomenon impossible to achieve with temporal coherent control only. We also demonstrate the control of a transient thermal grating on a timescale faster than the oscillation of the simultaneously excited coherent acoustic modes. Our new quantitative method allows for decomposing the coherent and incoherent dynamics in the sample by measuring the amplitude of the surface excursion with sub-Å precision and ≈ 70 ps temporal resolution. The modification of x-ray diffracti...

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confidence: 99%

Spatiotemporal Coherent Control of Thermal Excitations in Solids

et al. 2017

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“…These topography methods can be applied to visualize the interaction process with crystal lattice defects, to measure the power flow angles, and to obtain the wavelength of the SAW. The investigation of the SAW propagation process in solids via high-resolution X-ray diffractometry is based on the process of X-ray diffraction on a crystal lattice, which is sinusoidally modulated by the SAW [ 22 , 23 ]. The presence of such a diffraction grating leads to the appearance of diffraction satellites around the Bragg peak on the rocking curve.…”

Section: Introductionmentioning

confidence: 99%

Coefficients of Thermal Expansion in La3Ga5SiO14 and Ca3TaGa3Si2O14 Crystals

Рощупкин

Kovalev

2023

Materials

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The ordered Ca3TaGa3Si2O14 and disordered La3Ga5SiO14 crystals of the lantangallium silicate family were grown via the Czochralski method. The independent coefficients of thermal expansion of crystals αc and αa were determined using X-ray powder diffraction based on the analysis of X-ray diffraction spectra measured in the temperature range of 25~1000 °C. It is shown that, in the temperature range of 25~800 °C, the thermal expansion coefficients are linear. At temperatures above 800 °C, there is a nonlinear character of the thermal expansion coefficients, associated with a decrease in the Ga content in the crystal lattice.

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“…These topography methods can be used to visualize the interaction process with crystal lattice defects, to measure the power flow angles, and to determine the wavelength of the SAW. The investigation of the SAW propagation process in solids by high-resolution X-ray diffractometry is based on the process of X-ray diffraction on a crystal lattice which is sinusoidally modulated by the SAW [23][24][25]. The presence of such a diffraction grating leads to the appearance of diffraction satellites around the Bragg peak on the rocking curve.…”

Section: Introductionmentioning

confidence: 99%

Thermal Expansion Coefficients in La3Ga5SiO14 and Ca3TaGa3Si2O14 Crystals

Рощупкин¹,

Kovalev²

2023

Preprint

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The ordered Ca3TaGa3Si2O14 and disordered La3Ga5SiO14 crystals of the lantangallium silicate family were grown by the Czochralski method. The independent coefficients of thermal expansion of crystals αc and αa were determined by X-ray powder diffraction based on the analysis of X-ray diffraction spectra measured in the temperature range of 25÷1000°C. It is shown that in the temperature range of 25÷800°C the thermal expansion coefficients are linear. At temperatures above 800°C there is a nonlinear character of the thermal expansion coefficients associated with a decrease in the Ga content in the crystal lattice of the lantangallium silicate family crystals.

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X-ray diffraction on the X-cut of a Ca3TaGa3Si2O14 single crystal modulated by a surface acoustic wave

Cited by 11 publications

References 11 publications

Spatiotemporal Coherent Control of Thermal Excitations in Solids

Spatiotemporal Coherent Control of Thermal Excitations in Solids

Coefficients of Thermal Expansion in La3Ga5SiO14 and Ca3TaGa3Si2O14 Crystals

Thermal Expansion Coefficients in La3Ga5SiO14 and Ca3TaGa3Si2O14 Crystals

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