A5055155418- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Particle Detector Development and Performance
- Nuclear Physics and Applications
- Advanced Condensed Matter Physics
- Physics of Superconductivity and Magnetism
- Dark Matter and Cosmic Phenomena
- Nuclear physics research studies
- Radiation Detection and Scintillator Technologies
- Magnetism in coordination complexes
- Iron-based superconductors research
- Inorganic Fluorides and Related Compounds
- Rare-earth and actinide compounds
- Magnetic properties of thin films
- Particle physics theoretical and experimental studies
- Nuclear reactor physics and engineering
- Radiation Therapy and Dosimetry
- Quantum and electron transport phenomena
- Mechanical and Optical Resonators
- Silicon Carbide Semiconductor Technologies
- Crystal Structures and Properties
- Theoretical and Computational Physics
- Magnetic Field Sensors Techniques
- Radiation Effects in Electronics
- Optical Polarization and Ellipsometry
Czech Technical University in Prague
2019-2025
VSB - Technical University of Ostrava
2014-2018
Charles University
2003-2017
University of South Alabama
2005
Oak Ridge National Laboratory
2005
Abstract The workshop “Shedding light on X17” brings together scientists looking for the existence of a possible new particle, often referred to as X17. This hypothetical particle can explain resonant structure observed at $$\sim $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mo>∼</mml:mo> </mml:math> 17 MeV in invariant mass electron-positron pairs, produced after excitation nuclei such $$^8\hbox {Be}$$ <mml:mrow> <mml:msup> <mml:mrow /> <mml:mn>8</mml:mn> </mml:msup>...
We report Hall, magnetic, heat capacity, and doping studies from single crystals of ${\mathrm{Yb}}_{14}{\mathrm{MnSb}}_{11}$ ${\mathrm{Yb}}_{13.3}{\mathrm{La}}_{0.7}{\mathrm{MnSb}}_{11}$. These heavily doped semiconducting compounds are ferromagnetic below 53 39 K, respectively. The renormalization the carrier mass $2{m}_{e}$ near room temperature to $20{m}_{e}$ at 5 plus magnetic evidence for partial screening Mn moments suggest that these represent rare examples an underscreened Kondo...
Abstract At the Montreal Tandem accelerator, an experiment is being set up to measure internal pair creation from decay of nuclear excited states using a multiwire proportional chamber and scintillator bars surrounding it Daphne experiment. The acceptance covers solid angle nearly 4π. Preamplifiers data acquisition hardware have been designed tested. 7 LiF target, mounted on Al foil water-cooled in thin carbon fiber section beamline. will focus at first measurement 18.15 MeV state 8 Be with...
Theoretical and experimental studies of a quasi-two-dimensional quantum antiferromagnet $\text{Cu}(\mathrm{en}){({\mathrm{H}}_{2}\mathrm{O})}_{2}{\mathrm{SO}}_{4}$ $(\mathrm{en}={\mathrm{C}}_{2}{\mathrm{H}}_{8}{\mathrm{N}}_{2})$ were performed. ab initio calculations exchange interactions confirmed that the system represents realization spatially anisotropic zigzag square lattice. Corresponding Monte Carlo thermodynamic quantities realized results applied in analysis susceptibility,...
A theoretical ab-initio investigation of exchange interaction between Cu atoms in an insulating antiferromagnet Cu(H2O)2(en)SO4, en = C2H8N2, is reported. While the previous experimental studies described system's magnetism to be quasi-two-dimensional, our results, based on a mapping system onto effective Heisenberg model, rather support quasi-one-dimensional character with coupling being propagated mainly along zigzag line lying crystal's bc plane and connecting through N atoms. Further,...
We report on measurements of 1 and 1.5 MeV monoenergetic electrons with a Timepix3-based detector using 0.5 mm thick silicon sensor. A $^{90}$Sr $\beta$-emitting radioisotope was used as the source electrons, monochromator equipped an adjustable magnetic field employed to only pass desired energy into detector. provide experimental results deposited-energy spectrum in sensor linearity detected tracks. Alongside experiment, whole system has been modelled software Monte Carlo Geant4 /...
We present a method based on graph theory for the evaluation of inelastic propensity rules molecules exhibiting complete destructive quantum interference in their elastic transmission. The uses an extended adjacency matrix corresponding to structural molecule calculating Green’s function between sites with attached electrodes and consequently states conditions electron-vibration coupling must meet observation signal terminals. can be fully automated we provide functional website running code...
Elastic moduli, hardness (both at room temperature) and thermal expansion (4.2–670 K) have been experimentally determined for polycrystalline CePt3Si its prototype compound CePt3B as well single-crystalline CePt3Si. Resonant ultrasound spectroscopy was used to determine elastic properties (Young's modulus E Poisson's ratio ν) via the eigenfrequencies of sample knowledge mass dimensions. Bulk shear moduli were calculated from ν, respective Debye temperatures derived. In addition, ab initio...
We analyze color superconductivity of one massive flavor quark matter at moderate baryon density with a spin-zero color-sextet condensate. The most general Higgs-type ground-state expectation value the order parameter implies complete breakdown $\mathrm{SU}(3)\ifmmode\times\else\texttimes\fi{}U(1)$ symmetry. However, both conventional fourth-order polynomial effective bosonic description and Nambu--Jona-Lasinio--type fermionic in mean-field approximation favor an enhanced $\mathrm{SO}(3)$...
ADVERTISEMENT RETURN TO ISSUEPREVCommentNEXTComment on "Is the Antiresonance in Meta-Contacted Benzene Due to Destructive Superposition of Waves Traveling Two Different Routes around Ring"Rudolf Sýkora and Tomáš Novotný*View Author Information Department Condensed Matter Physics, Faculty Mathematics Charles University, Ke Karlovu 5, CZ-121 16 Prague 2, Czech Republic*E-mail: [email protected]Cite this: J. Phys. Chem. C 2017, 121, 35, 19538–19539Publication Date (Web):August 10,...
An analytically tractable simple model of a magnetic domain wall in ferromagnetic metal is considered and, assuming the ballistic regime electronic transport, transmission and reflection coefficients such are calculated within stationary scattering theory.It rederived that for realistic values electron energies widths coefficient very close to one thus an ideal itself (i.e.not taking into account other aspects as disorder) does not essentially represent hindrance transport.
In this paper the Mueller matrix ellipsometry in spectral range from 0.73 to 6.4 eV measured using dual rotating compensator ellipsometer RC2 (Woollam company) is applied study anisotropic crystals. First we summarize effects of optical anisotropy spectra. As an example uniaxial sample have characterized a Rutile (TiO2) tetragonal crystal. The axis parallel its surface. at variable angle incidence and azimuthal rotation angle. spectra are fitted model based on Kramers-Kronig consistent Basis...
Results of first-principles calculations the Fe/GaAs/Ag(001) epitaxial tunnel junctions reveal that hybridization interface resonances formed at both interfaces can enhance tunnelling anisotropic magnetoresistance (TAMR) systems. This mechanism is manifested by a non-monotonic dependence TAMR effect on thickness barrier, with maximum for intermediate thicknesses. A detailed scan k-resolved transmissions over two-dimensional Brillouin zone proves an interplay between few hybridization-induced...
We report a theoretical ab-initio investigation of the exchange interaction between Cu atoms in Cu(H2O)2(en)SO4, en=C2H8N2(ethylenediamine), an insulating magnetic material.Unlike previous experimental studies which describe system as quasi-two-dimensional antiferromagnet, our results, based on mapping onto eective Heisenberg model, suggest quasi-one-dimensional character magnetism, with coupling being propagated along zigzag line, lying crystal's bc plane and connecting through N...
Cross sections for the $^{35}\mathrm{Cl}(n,\ensuremath{\alpha})\phantom{\rule{0.16em}{0ex}}^{32}\mathrm{P}$ reaction were systematically measured at incident neutron energies in range of 3.3 to 5.3 MeV. The experiment was carried out on Van de Graaff accelerator EG-5 Frank Laboratory Neutron Physics, Joint Institute Nuclear Research, Russia. Fast neutrons produced $^{2}\mathrm{H}(d,n){\phantom{\rule{0.16em}{0ex}}}^{3}\text{He}$. Alpha particles from ($n,\ensuremath{\alpha}$) reactions...
Abstract Silicon Carbide is a suitable semiconductor sensor for radiation measurement and nuclear applications. It has been recently implemented as position-sensitive imaging device coupled to the Timepix3 ASIC chip in form of miniaturized camera MiniPIX-Timepix3 SiC. In this work we systematically evaluate detection resolving power different species: electrons, fast neutrons, ions protons. Experimental calibrations were made at well-defined reference fields terms particle type, energy...
The density functional theory was used to calculate elastic tensor for the quasi-one-dimensional antiferromagnetic compound Cu(en)(H₂O)₂SO₄, with en = C₂H8N₂. bulk, shear, Young moduli, Poisson ratio, and anisotropy were determined polycrystalline Cu(en)(H₂O)₂SO₄ by employing Hill averaging of single crystal constants. They compared respective quantities other low-dimensional magnetic systems. is predicted be soft ductile. We have also estimated Debye temperature using sound velocities...
Cross sections of the $^{91}\mathrm{Zr}(n,\ensuremath{\alpha})^{88}\mathrm{Sr}$ reaction were measured at four incident neutron energies in range 3.9 to 5.3 MeV. The experiment was carried out on Van de Graaff accelerator EG-5 Frank Laboratory Neutron Physics, Joint Institute for Nuclear Research, Russia. Fast neutrons produced via $^{2}\mathrm{H}(d,n)^{3}\mathrm{He}$ with a deuterium gas target. A twin gridded ionization chamber (GIC) used as charged particle detector, which...
We compare theoretically predicted, by means of ab-initio calculations, dielectric tensor and related experimental values obtained from Mueller-ellipsometry measurements an insulating monoclinic (optically biaxial) crystal Cu(H2O)2(en)SO4, en = C2H8N2.We concentrate on the static limit, ω → 0.
At the Montreal Tandem accelerator, an experiment is being set up to measure internal pair creation from decay of nuclear excited states using a multiwire proportional chamber and scintillator bars surrounding it DAPHNE experiment. The acceptance covers solid angle nearly 4$π$. Preamplifiers data acquisition hardware have been designed tested. water-cooled $^7$LiF target, mounted on Al foil in thin carbon fiber section beamline. will focus at first measurement 18.15 MeV state $^8$Be....