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High gas pressure up to llkbar has been applied for the synthesis of cuprates. Both single crystals and polycrystalline samples of Hg-based superconductors and quasi-one-dimensional A1−xCuO2 (A =Sr,Ca, Ba) compounds have been obtained. The influence of substitutions and oxygen content on the magnetic flux-pinning properties of single crystals of Hg-based superconductors has been investigated...
An overview is presented of the phase diagram, crystal growth, physical and structural investigations of Y2Ba4Cu6+nO14+n and HgBa2Can−1CunO2n+2+δ compounds synthesized at high pressure.
We have studied time-resolved intervalley transitions of electrons between the conduction band Gamma and L valleys in bulk GaN crystals using a two-color, femtosecond, pump-probe technique. The transition threshold and intervalley scattering times were determined.
We report experimental and theoretical studies on time-resolved generation and detection of coherent acoustic phonons in bulk GaN single crystals with an ultrafast two-color pump-probe technique. Optically-induced electronic stress is responsible for the phonon generation.
We have studied time-resolved intervalley transitions of electrons between the conduction band ?? and L valleys in bulk GaN crystals using a two-color, femtosecond, pump-probe technique. The transition threshold and intervalley scattering times were determined.
We report experimental and theoretical studies on time-resolved generation and detection of coherent acoustic phonons in bulk GaN single crystals with an ultrafast two-color pump-probe technique. Optically-induced electronic stress is responsible for the phonon generation.
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