Technology of Creation Periodic Structure on Surface Crystal of Paratellurite

In this paper presents the artificial periodic structures, first obtained by method of anisotropic etching the surface of single-crystal of paratellurite. The technology of this method is in detail presented in relation to paratellurite. The geometry of the structures was analyzed with an optical interferometric profiler NanoMap 1000 WLI

Technology of Creation Periodic Structure on Surface Crystal of Paratellurite

In this paper presents the artificial periodic structures, first obtained by method of anisotropic etching the surface of single-crystal of paratellurite. The technology of this method is in detail presented in relation to paratellurite. The geometry of the structures was analyzed with an optical interferometric profiler NanoMap 1000 WLI

Perspectives of application of nanotubes in modern composite building materials

There are described the perspectives of application a carbon and hydro silicate nanotubes in modern compositional materials. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/2063

Possibilities of magnetic resonance tomography in identification and diagnostics of neurosyphilis forms

Aim: To evaluate the possibilities of the magnetic resonance tomography (MRT) in diagnostics and identification of neurosyphilis. Materials and methods: A total of 1387 patients with different forms of documented neurosyphilis were examined to study the deficiency of neurological function. The diagnosis of neurosyphilis was confirmed by CSF-study. MRT was performed in 57 cases. Results: Magnetic resonance tomography (MRT) in 6 patients showed no pathology, 16 patients had arachnoid cystic changes and in 16 cases hydrocephaly occurred. Cerebral cortical atrophy was presented in 13 patients, in 12 cases — multifocal changes were visualized, 12 patients had white matter structural changes. Two cases required diagnostics. A 59-year-old man was hospitalized with epileptic seizure, progressive dementia and multifocal neurologic symptoms. A 40-year-old man was examined with recurring episodes of acute cere-brospinal accident and progressing cognitive disorders. Conclusion: MRT could be used in differential diagnostics of neurosyphilis imitating space-occupying lesions of cerebrum and spinal cord, tumors of central nervous system and could help to define the form of neurosyphili

Unconventional Hund Metal in a Weak Itinerant Ferromagnet

The physics of weak itinerant ferromagnets is challenging due to their small magnetic moments and the ambiguous role of local interactions governing their electronic properties, many of which violate Fermi-liquid theory. While magnetic fluctuations play an important role in the materials’ unusual electronic states, the nature of these fluctuations and the paradigms through which they arise remain debated. Here we use inelastic neutron scattering to study magnetic fluctuations in the canonical weak itinerant ferromagnet MnSi. Data reveal that short-wavelength magnons continue to propagate until a mode crossing predicted for strongly interacting quasiparticles is reached, and the local susceptibility peaks at a coherence energy predicted for a correlated Hund metal by first-principles many-body theory. Scattering between electrons and orbital and spin fluctuations in MnSi can be understood at the local level to generate its non-Fermi liquid character. These results provide crucial insight into the role of interorbital Hund’s exchange within the broader class of enigmatic multiband itinerant, weak ferromagnets

Spin-orbit coupling control of anisotropy, ground state and frustration in 5d2 Sr2MgOsO6

The influence of spin-orbit coupling (SOC) on the physical properties of the 5d2 system Sr2MgOsO6 is probed via a combination of magnetometry, specific heat measurements, elastic and inelastic neutron scattering, and density functional theory calculations. Although a significant degree of frustration is expected, we find that Sr2MgOsO6 orders in a type I antiferromagnetic structure at the remarkably high temperature of 108 K. The measurements presented allow for the first accurate quantification of the size of the magnetic moment in a 5d2 system of 0.60(2) μB –a significantly reduced moment from the expected value for such a system. Furthermore, significant anisotropy is identified via a spin excitation gap, and we confirm by first principles calculations that SOC not only provides the magnetocrystalline anisotropy, but also plays a crucial role in determining both the ground state magnetic order and the size of the local moment in this compound. Through comparison to Sr2ScOsO6, it is demonstrated that SOC-induced anisotropy has the ability to relieve frustration in 5d2 systems relative to their 5d3 counterparts, providing an explanation of the high TN found in Sr2MgOsO6

Nanotube-based source of charges for experiments with solid helium at low temperatures

Methods of preparation of the field-emission sources of charges from carbon nanotubes suitable for study of injected charges in solid helium at low temperatures T < 1 K are presented. The sources have been prepared by arc discharge deposition of nanotubes onto a flat copper substrate or by mechanical rubbing of nanotubes into porous metal surface. The test study of the voltage-current characteristics of a diode cell with the nanotube source in superfluid He II have shown that at voltages above 120 V one can observe a relatively large current I ≥ 10⁻¹³ A of negative charges in liquid helium. The field and temperature dependences of positive and negative currents in solid ⁴He were studied in samples grown by the blocked capillary technique. Usage of the nanotube based source of injected charges had permitted us for the first time to observe motion of the positive charges in solid helium at temperatures below 0.1 К. The current-voltage dependence could be described by a power law I ~ Uα, with the value of the exponent α >> 2, much higher than what one would expect for the regime of space charge limited currents

Single-photon emitters in GaSe

Single-photon sources are important building blocks for quantum information technology. Emitters based on solid-state systems provide a viable route to integration in photonic devices. Here, we report on single-photon emitters in the layered semiconductor GaSe. We identify the exciton and biexciton transition of the quantum emitters with power-dependent photoluminescence and photon statistics measurements. We find evidence that the localization of the excitons is related to deformations of the GaSe crystal, caused by nanoscale selenium inclusions, which are incorporated in the crystal. These deformations give rise to local strain fields, which induce confinement potentials for the excitons. This mechanism lights the way for the controlled positioning of single-photon emitters in GaSe on the nanoscale