Publications by authors named "O Gorobtsov"
Mott metal-insulator transitions possess electronic, magnetic, and structural degrees of freedom promising next-generation energy-efficient electronics. A previously unknown, hierarchically ordered, and anisotropic supercrystal state is reported and its intrinsic formation characterized in-situ during a Mott transition in a CaRuO thin film. Machine learning-assisted X-ray nanodiffraction together with cryogenic electron microscopy reveal multi-scale periodic domain formation at and below the film transition temperature (T ≈ 200-250 K) and a separate anisotropic spatial structure at and above T.
View Article and Find Full Text PDFReal-space imaging of periodic nanotextures in thin films via phasing of diffraction data.
Proc Natl Acad Sci U S A
July 2023
Article Synopsis
- New periodic nanotextures can arise in materials due to nanoscale features, leading to interesting quantum phenomena like Moire patterns and topologically protected states.
- The study develops a new, nondestructive imaging technique that uses advanced methods to convert diffuse X-ray scattering data into clear images of structural changes in thin films, specifically in a Mott insulator.
- Results show that one material, CaRuO, exhibits a novel strain-induced nanotexture that has not been seen in bulk crystals, suggesting exciting new possibilities for exploring quantum materials.
Article Synopsis
- * The study uses Bragg coherent X-ray diffractive imaging to observe nanoscale structural dynamics in BZY over 40 hours at 200 °C, revealing surprising topological defects and cracking despite overall material stability.
- * Findings indicate that nanoscale processes significantly influence proton conductivity and hydration in solid oxides, providing insights for improving low-temperature protonic ceramic electrochemical cells.
Shear displacement gradient in X-ray Bragg coherent diffractive imaging.
J Synchrotron Radiat
May 2022
Bragg coherent X-ray diffractive imaging is a cutting-edge method for recovering three-dimensional crystal structure with nanoscale resolution. Phase retrieval provides an atomic displacement parallel to the Bragg peak reciprocal lattice vector. The derivative of the displacement along the same vector provides the normal strain field, which typically serves as a proxy for any structural changes.
View Article and Find Full Text PDFSecond-order intensity interferometry was employed to study the spatial and temporal properties of the European X-ray Free-Electron Laser (EuXFEL). Measurements were performed at the soft x-ray Self-Amplified Spontaneous Emission (SASE3) undulator beamline at a photon energy of 1.2 keV in the Self-Amplified Spontaneous Emission (SASE) mode.
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