A5024329288- Astrophysics and Cosmic Phenomena
- High-pressure geophysics and materials
- Neutrino Physics Research
- Particle accelerators and beam dynamics
- Computational Physics and Python Applications
- Geological and Geochemical Analysis
- Advanced Condensed Matter Physics
- Crystal Structures and Properties
- Rare-earth and actinide compounds
- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- Hydrogen Storage and Materials
- Intermetallics and Advanced Alloy Properties
- Magnetic Properties of Alloys
- Radio Astronomy Observations and Technology
- Geomagnetism and Paleomagnetism Studies
- Nuclear Materials and Properties
- Diamond and Carbon-based Materials Research
- X-ray Spectroscopy and Fluorescence Analysis
- Boron and Carbon Nanomaterials Research
- Earthquake Detection and Analysis
- Scientific Research and Discoveries
- Methane Hydrates and Related Phenomena
- Crystallography and Radiation Phenomena
- Magneto-Optical Properties and Applications
Institute for Nuclear Research
2004-2023
Russian Academy of Sciences
1997-2009
Peeking into a diamond pressure cell A defining characteristic of superconductor is that it expels an external magnetic field. Demonstrating this effect can be tricky when the sample under enormous pressures in anvil cell. Troyan et al. placed tinfoil sensor inside H 2 S pressure. They then bombarded with synchrotron radiation and watched how scattering photons tin nuclei changed over time. When was normal state, field reached through sample, causing nuclear levels to split. In...
A miniature versatile nonmagnetic diamond anvil cell for diverse physical property measurement under cryogenic environments and high magnetic fields at pressure has been developed. Several such cells have manufactured tested in the Physical Properties Measurement System (PPMS) by Quantum Design pressures low temperatures. The good stability during temperature scans down to helium temperatures back room temperature. strong demonstrated excellent properties. wide-angle side openings give...
Abstract Insulator-metal transition in NiO and concomitant collapse of spin magnetism the material are important subjects studies strong electronic correlations as such they generate multiple theoretical experimental efforts aimed at understanding complicated physics strongly correlated systems. We report here iso-structural accompanying previously observed by us to metallic state. These findings resolve some controversies regarding transition. also discuss latest results detail show that...
Ferropericlase [(Mg,Fe)O] is one of the most abundant minerals earth’s lower mantle. The high-spin (HS) to low-spin (LS) transition in Fe 2+ ions may dramatically alter physical and chemical properties (Mg,Fe)O deep To understand effects compression on ground electronic state iron, magnetic states (Mg 0.75 0.25 )O have been investigated using transmission synchrotron Mössbauer spectroscopy at high pressures low temperatures (down 5 K). Our results show that critical pressure P c spin close T...
The langasite-type crystals with 3d ions are considered as a class of multiferroics in which ferroelectricity can be induced by the magnetic ordering. In this paper, high-pressure states powdered sample Ba3TaFe3Si2O14 have been investigated diamond anvil cell nuclear forward scattering synchrotron radiation technique at different temperatures hydrostatic conditions. pressure range 0 < P 19.5 GPa, an increase Neel temperature TN from 27 to 41 K was observed antiferromagnetic phase...
Electronic spin transitions of iron in the Earth’s mantle minerals are great interest to deep-Earth researchers because their effects on physical and chemical properties can significantly affect our understanding deep planet. Here we have studied electronic states ringwoodite (Mg0.75Fe0.25)2SiO4 using synchrotron Mössbauer spectroscopy a diamond-anvil cell up 82 GPa. The starting samples were analyzed extensively transmission scanning electron microscopes investigate nanoscale crystal...
NdFeAsO0.88F0.12 belongs to the recently discovered family of high-TC iron-based superconductors. The influence high pressure on transport properties this material has been studied. Contrary La-based compounds, we did not observe a maximum in TC under pressure. Under compression, drops rapidly as linear function with slope k = -2.8 \pm 0.1 K / GPa. extrapolated value at zero is about (0) 51.7 0.4 K. At pressures higher than ~18.4 GPa, superconducting state disappears all measured...
An attractive technique to explore for super-high-energy cosmic neutrino fluxes, via deep underwater acoustic detection, is discussed. Acoustic signals emitted by the induced cascades at large distances (10-50 km) from are considered. It argued that an existing hydroacoustic array of 2400 hydrophones, which available in Great Ocean near Kamchatka Peninsula, could be used as a base exploratory telescope SADCO (Sea Detector Cosmic Objects). The detection volume registration with energies range...
A method of simulation particle cascades induced by ultra-high (>10$^{15}$ eV) and extremely high (>10$^{18}$ energy neutrinos in water or other dense medium has been elaborated. The lateral spread high-energy particles due to Coulomb scattering is negligible. So it possible use an approximation the one-dimensional development UHE (or EHE) cascade if energies higher than 10-100 GeV. An original program EHE media taking into account fluctuations Landau-Pomeranchuk-Migdal effect GEANT4 package...