A5105406937- Rare-earth and actinide compounds
- Neutrino Physics Research
- Iron-based superconductors research
- Particle physics theoretical and experimental studies
- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Nuclear physics research studies
- Physics of Superconductivity and Magnetism
- Magnetic Properties of Alloys
- Nuclear Physics and Applications
- Inorganic Chemistry and Materials
- Atomic and Subatomic Physics Research
- Crop Yield and Soil Fertility
- Dark Matter and Cosmic Phenomena
- Theoretical and Computational Physics
- Multiferroics and related materials
- Astrophysics and Cosmic Phenomena
- 2D Materials and Applications
- Topological Materials and Phenomena
- Potato Plant Research
- Superconducting Materials and Applications
- Advanced Chemical Physics Studies
- Soil Mechanics and Vehicle Dynamics
Charles University
2013-2024
Heinz Maier-Leibnitz Zentrum
2015-2024
Forschungszentrum Jülich
2014-2023
Comenius University Bratislava
2009-2021
University Library in Bratislava
2021
Czech Technical University in Prague
2006-2015
Institut Laue-Langevin
2013
Czech Academy of Sciences, Institute of Atmospheric Physics
2006-2012
Joint Institute for Nuclear Research
2009-2011
Protéomique, Réponse Inflammatoire et Spectrométrie de Masse
2009-2011
We report on comprehensive results identifying the ground state of a triangular-lattice structured YbZnGaO$_4$ to be spin glass, including no long-range magnetic order, prominent broad excitation continua, and absence thermal conductivity. More crucially, from ultralow-temperature a.c. susceptibility measurements, we unambiguously observe frequency-dependent peaks around 0.1 K, indicating spin-glass state. suggest this conclusion hold also for its sister compound YbMgGaO$_4$, which is...
Evolution of magnetism in single crystals the van der Waals compound $\mathrm{V}{\mathrm{I}}_{3}$ external pressure up to 7.3 GPa studied by measuring magnetization and ac magnetic susceptibility is reported. Four phase transitions, at ${T}_{1}=54.5\phantom{\rule{0.16em}{0ex}}\mathrm{K}, {T}_{2}=53\phantom{\rule{0.16em}{0ex}}\mathrm{K}, {T}_{\mathrm{C}}=49.5\phantom{\rule{0.16em}{0ex}}\mathrm{K}$, ${T}_{\mathrm{FM}}=26\phantom{\rule{0.16em}{0ex}}\mathrm{K}$, respectively, have been observed...
The results of a single-crystal x-ray-diffraction study the evolution crystal structures $\mathrm{V}{\mathrm{I}}_{3}$ with temperature an emphasis on phase transitions are presented. Some related specific-heat and magnetization data included. existence room-temperature trigonal structure $R\overline{3}$ (148) has been confirmed. Upon cooling, undergoes structural transition to monoclinic at ${T}_{\mathrm{s}}\ensuremath{\sim}79\phantom{\rule{0.16em}{0ex}}\mathrm{K}$. ${T}_{\mathrm{s}}$ is...
The interactions between elementary excitations such as phonons, plasmons, magnons, or particle-hole pairs, drive emergent functionalities and electronic instabilities multiferroic behaviour, anomalous thermoelectric properties, polar order, superconductivity. Whereas various hybrid have been studied extensively, the feed-back of prototypical on crystal electric fields (CEF), defining environment in which arise, has explored for very strong coupling only. We report high-resolution neutron...
The cold three axes spectrometer PANDA, operated by JCNS, Forschungszentrum Jülich, offers high neutron flux over a large dynamic range keeping the instrumental background comparably low.
Abstract The neutron spin resonance is a collective magnetic excitation that appears in the unconventional copper oxide, iron pnictide and heavy fermion superconductors. Although commonly associated with spin-exciton due to d ( s ± )-wave symmetry of superconducting order parameter, it has also been proposed be magnon-like appearing state. Here we use inelastic scattering demonstrate superconductor Ce 1− x Yb CoIn 5 =0, 0.05 0.3 ring-like upward dispersion robust against Yb-doping. By...
Superconductivity mediated by phonons is typically conventional, exhibiting a momentum-independent s-wave pairing function, due to the isotropic interactions between electrons and along different crystalline directions. Here, performing inelastic neutron scattering measurements on superconducting single crystal of Sr0.1Bi2Se3, prime candidate for realizing topological superconductivity doping insulator Bi2Se3, we find that there exist highly anisotropic phonons, with linewidths acoustic...
Abstract Spin-fluctuation-mediated unconventional superconductivity can emerge at the border of magnetism, featuring a superconducting order parameter that changes sign in momentum space. Detection such sign-change is experimentally challenging, since most probes are not phase-sensitive. The observation spin resonance mode (SRM) from inelastic neutron scattering often seen as strong phase-sensitive evidence for sign-changing parameter, by assuming SRM spin-excitonic bound state. Here we show...
The $\mathrm{Ce}T{X}_{3}$ compounds belong to the intensively studied group of materials revealing such properties as valence fluctuations, heavy-fermion behavior, or pressure-induced superconductivity. So far, magnetic structure was investigated in only a few these. We performed series neutron-diffraction experiments on structurally well-defined ${\mathrm{CeCuAl}}_{3}$ single crystal. ordered non-centro-symmetric tetragonal ${\mathrm{BaNiSn}}_{3}$-type (I4mm) crystal well antiferromagnetic...
${\mathrm{La}}_{0.4}{\mathrm{Na}}_{0.6}{\mathrm{Fe}}_{2}{\mathrm{As}}_{2}$ single crystals have been grown out of an NaAs flux in alumina crucible and characterized by measuring magnetic susceptibility, electrical resistivity, specific heat, as well single-crystal x-ray neutron diffraction. show a structural phase transition from high-temperature tetragonal to low-temperature orthorhombic at ${T}_{s}\phantom{\rule{0.16em}{0ex}}=\phantom{\rule{0.16em}{0ex}}125$ K. This is accompanied anomaly...
A set of 29 pond sediments samples was collected. The were separated into three groups, field, village, and forest sediments. sediment taken from bottoms heaps. characteristics (pH, CEC, Al-exchangeable, Cox, humus substances), the content potentially toxic elements persistent organic pollutants analysed in compared between groups. comparison contamination with Czech legislation for use agriculture conducted. village more loaded by than others. pH value considered as properties regulating...
We report on plans for a multiplexed neutron analyser option the PANDA spectrometer. The key design concept is to have many analysers positioned give large coverage in scattering plane, and multiple arcs of these measure different energy transfers simultaneously. main goal bring intensity gains improved reciprocal-space mapping capabilities existing cold triple-axis
In contrast to magnetic order formed by electrons' dipolar moments, ordering phenomena associated with higher-order multipoles (quadrupoles, octupoles, etc.) are more difficult characterize because of the limited choice experimental probes that can distinguish different multipolar moments. The heavy-fermion compound CeB6 and its La-diluted alloys among best-studied realizations long-range-ordered phases, often referred as "hidden order." Previously, hidden in phase II was identified primary...
We report on a neutron diffraction study of single-crystal ${\mathrm{CePtAl}}_{3}$ complemented by measurements the specific heat under applied magnetic field. Below ${T}_{\mathrm{N}}\ensuremath{\approx}3$ K, develops incommensurate antiferromagnetic order with single modulation vector $\mathbf{k}$ = $(0.676\phantom{\rule{0.16em}{0ex}}0\phantom{\rule{0.16em}{0ex}}0)$. Residual scattering intensity above ${T}_{\mathrm{N}}$ and broadening anomaly at may be consistently described in terms...
Abstract Multiferroic Ba 2 CuGe O 7 was anticipated as a potential member of the exciting group materials hosting skyrmion or vortex lattice because its profound Dzyaloshinskii–Moriya interaction (DMI) and absence single ion anisotropy (SIA). This phase, however, could not be evidenced instead, it exhibits complex incommensurate antiferromagnetic (AFM) cycloidal structure. Its sister compound MnGe , in contrast, is characterized by relatively strong in-plane exchange that competes with...
Search for double beta decay (β+β+, β+/EC, EC/EC) of 106Cd was performed at the Modane underground laboratory (4800 m w.e.) using a spectrometer TGV-2 with 32 HPGe detectors. New limits on half-lives 0vEC/EC resonant – T1/2 ≥ 1.6 × 1020 y, and 2vEC/EC − 4.1 y (at 90% CL) were obtained from preliminary calculations experimental data accumulated 12900 h measurement ~13.6 g enrichment 75%. The to 2+,512 keV 0+1,1334 excited states 106Pd 2vβ+β+ 2vβ+/EC improved
The SuperNEMO experiment is devoted to neutrinoless double beta decay detection and main R&D of the detector design already finished. crucial role in such low background experiments plays suppression background. One most important sources radioactivity radon gas its daughter products. activity volume will be reduced significantly using antiradon facility installed Modane underground laboratory which provides air with a at order ∼ mBq/m3. To able measure activities output this reasonable time...