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| STRIPEX – Vplyv dynamických nábojových pásov na kvantové magnety a supravodiče v extrémnych podmienkach | |
| Influence of dynamic charge stripes on quantum magnets and superconductors in extreme conditions | |
| Program: | SRDA |
| Project leader: | doc. RNDr. Gabáni Slavomír, PhD. |
| Annotation: | The project is aimed at solving the urgent fundamental problem of the genesis of the so-called of dynamic charge stripes (DCS) – inhomogeneous distribution of conduction electron oscillations – and their influence on the properties of strongly correlated electron systems (SCES). The charge stripes play an important role in the high-temperature superconductivity (HTSC) of cuprates and also underlie the mechanisms responsible for the colossal magnetoresistance in manganites, cobaltites, iron-based HTSCs, etc. Observing directly the effect of DCS on the scattering of charge carriers in the mentioned SCES is very sophisticated due to their complex composition, low symmetry of the crystal structure and high sensitivity to external conditions. Instead, it is suitable to use model SCES. Such model materials are rare earth dodecaborides (RB12) with Jahn-Teller structural instability and electronic phase separation on the nanoscale range, in which the appearance of dynamic charge stripes was reliably determined for the first time both for superconductors (ZrB12, LuB12) and for quantum magnets (R = Ho, Er, Tm). The comprehensive study of DCS will be extended by additional model systems based on hexaborides (RB6) and frustrated quantum magnets based on rare earth tetraborides (RB4), and will includes the influence of external extreme conditions such as very low temperatures, high magnetic fields and pressures. |
| Duration: | 1.7.2024 – 30.6.2028 |
| Teoretické štúdium vlastností geometricky a interakčne frustrovaných magnetických systémov | |
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| Program: | VEGA |
| Project leader: | RNDr. Jurčišinová Eva, PhD. |
| Duration: | 1.1.2023 – 31.12.2026 |
| Teoretické štúdium frustrovaných magnetických systémov | |
| Theoretical study of frustrated magnetic systems | |
| Program: | SRDA |
| Project leader: | RNDr. Jurčišin Marián, PhD. |
| Duration: | 1.7.2021 – 30.6.2025 |
| Anomálne škálovanie v turbulentných systémoch s narušenou symetriou | |
| Anomalous scaling in turbulent systems with symmetry breaking | |
| Program: | VEGA |
| Project leader: | RNDr. Jurčišin Marián, PhD. |
| Annotation: | Turbulent behavior belongs among basic properties of various macroscopic physical, chemical, biological,social-economical, financial, as well as environmental systems. Typical well-known examples of turbulent motionsare various atmospheric phenomena (tornadoes, hurricanes, cyclones, etc.), turbulent streams in rivers andoceans, and turbulent motions in electrically conductive environments (motion of the outer earth core, solar wind,etc.) . The main task of theoretical investigations of turbulent systems is, first of all, the understanding offundamental physical properties of turbulent flows that are common for all turbulent systems and which couldpotentially be applied in technical praxis in the future. In this respect, the main aim of the project is theinvestigation of the influence of breaking of various symmetries of developed turbulent environments on theproperties of the anomalous scaling of correlation functions of fluctuating fields as well as on universalcharacteristics of turbulent systems. |
| Duration: | 1.1.2021 – 31.12.2024 |
| FRUSTKOM – Frustrované kovové magnetické systémy | |
| Frustrated metallic magnetic systems | |
| Program: | SRDA |
| Project leader: | doc. RNDr. Gabáni Slavomír, PhD. |
| Annotation: | The up to now experimental and theoretical studies of frustrated magnetic systems (FMS) has been concentrated mainly on dielectric systems. Such systems can be found in 2D and 3D lattices based on equilateral triangles, and in dielectrics the interaction between their spins can be relatively well defined and described. In metallic FMS (M-FMS), which have been much less studied, an important role plays the long-range indirect exchange interaction between the spins mediated by conduction electrons (the RKKY interaction). To the small number of up to now studied M-FMS belong also some rare earth metallic borides having a fcc (e.g.HoB12, ErB12) or Shastry-Sutherland (e.g.TmB4, HoB4, ErB4) structure. This project aims are to investigate experimentally the impact of high pressure (hydrostatic and uniaxial), the influence of alloying and the anisotropy on the magnetic, transport and thermal properties of M -FMS, which has not been studied yet. A pioneering work will be above all the direct observation of magnetic structures of individual phase diagram regions of these M-FMS by spin-polarized scanning tunnelling microscopy. Investigated will be also the dynamics of magnetic structures (the influence of the rate of change of the magnetic field on these structures) and the study of magnetic excitations (by neutron diffraction methods) in selected tetraborides and dodecaborides.The challenging experimental studies, for which both high quality samples and suitable methods are already available, will be supported by the theoretical interpretation of received results, and by the theoretical elaboration. |
| Project webpage: | http://extremeconditions.saske.sk/projects/ |
| Duration: | 1.8.2018 – 31.12.2022 |
| Štúdium termodynamických vlastností frustrovaných magnetických systémov exaktne riešiteľnými modelmi | |
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| Program: | VEGA |
| Project leader: | RNDr. Jurčišinová Eva, PhD. |
| Annotation: | The main aim of the project will be the study of various thermodynamic properties of antiferromagnetic as well as ferromagnetic frustrated systems in the framework of exactly solvable classical models of the statistical mechanics. In the framework of the realization of the project the main attention will be concentrated on the investigation of their properties related to the frustration such as anomalous low-temperature behavior of the specific heat capacity; magnetocaloric effect and the corresponding (de)magnetization adiabatic cooling processes and their effectiveness; magnetization properties, structure and macroscopic degeneracy of ground states; entropic properties and critical behavior of frustrated systems, as well as the influence of various additional interactions on these properties and processes. |
| Duration: | 1.1.2019 – 31.12.2022 |
| Štúdium univerzálnych vlastností difúznych procesov v turbulentných prostrediach | |
| Study of universal properties of diffusion proceses in turbulent environments | |
| Program: | VEGA |
| Project leader: | RNDr. Jurčišin Marián, PhD. |
| Annotation: | One of the basic attributes of macroscopic physical, chemical, biological, and also social-economical and environmental systems is their stochasticity. This fact is the main reason for present intensive scientific interest about various stochastic systems. Advection of various admixtures in random environments, turbulence and magnetohydrodynamic turbulence, or crossing of cosmic particles through interstellar space, are typical examples. The importance of intensive Investigation of these problems is dictated by need for fundamental understanding of the physical nature of phenomena which are involved in them, as well as from the point of view of their potential future applications in technical praxis. The aim of the project is the study of the anomalous scaling of structure and correlation functions of fluctuating fields in turbulent systems without and with symmetry breaking, as well as the study and the calculation of universal characteristics of such turbulent systems. |
| Duration: | 1.1.2017 – 31.12.2020 |
| Štúdium vlastností turbulentných prostredí s narušenými symetriami | |
| (Study of properties of turbulent environments with symmetry breaking | |
| Program: | VEGA |
| Project leader: | RNDr. Jurčišin Marián, PhD. |
| Annotation: | The fact that the stochasticity belongs among basic attributes of macroscopic physical, chemical, biological, and also social-economical and environmental systems is the main reason for present intensive scientific interest about stochastic systems. Advection of an admixture in random environments, crossing of cosmic particlesthrough interstellar space, turbulence and MHD turbulence are typical examples. Investigation of these problems is important for understanding of the physical nature of phenomena which are involved in them, as well as from the point of view of their future applications in technical praxis. The aim of the project is to study the anomalous scaling of correlation functions of fluctuating fields in turbulent systems with symmetry breaking, to calculate universal parameters of turbulent systems (e.g., the turbulent Prandtl number) and to analyze the helical MHD turbulence from the point of view of generation of homogeneous macroscopic magnetic field. |
| Duration: | 1.1.2013 – 31.12.2016 |
| CKV – Centrum kozmických výskumov: vplyvy kozmického počasia – druhá etapa | |
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| Program: | EU Structural Funds Research & Development |
| Project leader: | Prof. Ing. Kudela Karel, DrSc. |
| Project webpage: | http://ckv.astro.sk/ |
| Duration: | 1.3.2010 – 30.6.2014 |
| Štúdium anomálneho škálovania v stochastických a turbulentných systémoch s narušenými symetriami | |
| Study of anomalous scaling in stochastic and turbulent systems with symmetry breaking | |
| Program: | VEGA |
| Project leader: | prof. Dr.h.c. RNDr. Hnatič Michal, DrSc. |
| Annotation: | At present stochastic systems attract intensive interest of scientists. This interest is based on the fact that stochasticity belongs to the basic attributes of macroscopic physical, chemical, biological and, moreover, social-economical systems. Advection of admixtures in random environment (pollutants in the atmosphere of theEarth), crossing of cosmic particles through interstellar space, developed (magneto)hydrodynamic turbulenceare typical examples of stochastic systems.It is just the study of the aforementioned physical systems that will form the core of the project.Anomalous scaling is a crucial and universal feature of stochastic systems. Calculation of representativeparameters of the systems like effective viscosity, Prandtl number, Kolmogorov constant etc. forms an important part of scientific interest.Calculation of anomalous exponents and parameters of the systems with symmetry violation will be the basic objective of the project. |
| Duration: | 1.1.2009 – 31.12.2012 |
| CKV – Centrum kozmických výskumov: vplyvy kozmického počasia | |
| Center of Space Research: influence of space weather | |
| Program: | EU Structural Funds Research & Development |
| Project leader: | Prof. Ing. Kudela Karel, DrSc. |
| Duration: | 24.4.2009 – 31.8.2012 |