Krstovska, Danica
Preferred name
Krstovska, Danica
Official Name
Krstovska, Danica
Main Affiliation
Email
danica@pmf.ukim.mk
13 results
Now showing 1 - 10 of 13
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Item type:Publication, Properties of surface electronic states in layered organic conductors in out-of-plane magnetic field(World Scientific Pub Co Pte Ltd, 2022-08-25); ; Gjorgjevski, Milan<jats:p> In this paper, we have considered the properties of surface electronic states in quasi-two-dimensional organic conductors for an out-of-plane orientation of the magnetic field. The energies of these states have be calculated which allow the resonance magnetic fields and resonance angles corresponding to the positions of the peaks in oscillation spectra of surface resistance to be determined. We find that the energies of the magnetic-field induced surface states are decreasing significantly with increasing tilt angle from the surface. This is related to the fact that the surface states are realized due to electron transitions between different in size elliptical closed orbits obtained as cross-section of the Fermi surface with the plane [Formula: see text], [Formula: see text] const. In comparison to the case of in-plane magnetic field, where only the small closed orbits on the sides of the Fermi surface are involved in formation of the surface states, for out-of-plane magnetic field there are additionally present other, larger orbits that are spanning across the Fermi surface. We also find that the coordinate of the center of electron revolution is increasing significantly with increasing tilt angle but the maximum distance from the surface for the electrons involved in the surface states shows a steady increase indicating that the skipping trajectories are well confined within skin layer of the conductor. This indicates that the surface states can be observed for almost each field direction from the surface including those with higher quantum number. These studies allow to determine more accurately certain Fermi surface parameters such as the local radius of curvature in the plane perpendicular to the magnetic field as well as the Fermi velocity at each point on the elliptical cross-sections. We are highly convinced that our results will motivate new experimental investigations of surface phenomena in order to exploit the properties of surface electronic states for various scientific applications. </jats:p> - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Surface-state energies and wave functions in layered organic conductors(Walter de Gruyter GmbH, 2020-11-26); We have calculated and analyzed the surface-state energies and wave functions in quasi-two dimensional (Q2D) organic conductors in a magnetic field parallel to the surface. Two different forms for the electron energy spectrum are used in order to obtain more information on the elementary properties of surface states in these conductors. In addition, two mathematical approaches are implemented that include the eigenvalue and eigenstate problem as well as the quantization rule. We find significant differences in calculations of the surface-state energies arising from the specific form of the energy dispersion law. This is correlated with the different conditions needed to calculate the surface-state energies, magnetic field resonant values and the surface wave functions. The calculations reveal that the value of the coordinate of the electron orbit must be different for each state in order to numerically calculate the surface energies for one energy dispersion law, but it has the same value for each state for the other energy dispersion law. This allows to determine more accurately the geometric characteristics of the electron skipping trajectories in Q2D organic conductors. The possible reasons for differences associated with implementation of two distinct energy spectra are discussed. By comparing and analyzing the results we find that, when the energy dispersion law obtained within the tight-binding approximation is used the results are more relevant and reflect the Q2D nature of the organic conductors. This might be very important for studying the unique properties of these conductors and their wider application in organic electronics.</jats:p> - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Ultrasonic wave generation in two-band organic conductors due to thermoelectric effect(World Scientific Pub Co Pte Lt, 2017-12-10)<jats:p> A linear thermoelectric generation of a longitudinal ultrasonic wave in organic conductors with two conducting channels, quasi-one dimensional (q1D) and quasi-two dimensional (q2D), is investigated theoretically. The magnetic field and temperature dependences of the amplitude of generated through Nernst effect wave in [Formula: see text]-(BEDT-TTF)<jats:sub>2</jats:sub>KHg(SCN)<jats:sub>4</jats:sub> for two boundary conditions, isothermal and adiabatic are obtained. Findings show a preference of one type of a boundary over another in the wave generation and propagation depending on the magnetic field strength and temperature. At lower temperatures and above B[Formula: see text]=[Formula: see text]4 T, the wave amplitude for adiabatic boundary is smaller compared to the one for isothermal boundary although there is a heat flux through the conductor’s surface in the latter. Both the q1D and q2D charge carriers contribute to the observation of the effect but with different magnitude due to the different drift velocity along the direction of wave propagation. </jats:p> - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Giant Angular Nernst Effect in the Organic Metal α-(BEDT-TTF)2KHg(SCN)4(MDPI AG, 2023-01-10); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Quantum Oscillations of the Interlayer Magnetothermopower in a Q2D Organic Conductor(Physical Society of Japan, 2011-04-15) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Recyclable organic bilayer piezoresistive cantilever for torque magnetometry at cryogenic temperatures(Elsevier BV, 2024-04); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Thermopower Quantum Oscillations in the Charge Density Wave State of the Organic Conductor $$\upalpha $$ α -(BEDT-TTF) $$_{2}\text {KHg}(\text {SCN})_{4}$$ 2 KHg ( SCN ) 4(Society for Mining, Metallurgy and Exploration Inc., 2019-02-07); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Second harmonic wave generation from Joule heating in layered organic conductors(Springer Science and Business Media LLC, 2017-12); Mitreska, Biljana - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Magnetic oscillation spectrum of surface resistance in layered organic compounds(IOP Publishing, 2023-02-14); <jats:title>Abstract</jats:title> <jats:p>The magnetic quantum oscillations of surface resistance in quasi-two dimensional layered organic conductors have been obtained numerically for a magnetic field parallel to the surface. The resonance fields, which were theoretically calculated in a previous work on surface states, are found to coincide closely to the positions of the maxima in the ∂<jats:italic>R</jats:italic>/∂<jats:italic>B</jats:italic> curves. We find that, in quasi-two dimensional organic conductors, the transitions between the adjacent surface states are the most present transitions in the sum curve for surface resistance derivative oscillation spectrum. Our results, obtained from the calculations of the oscillation spectra of the individual series and the sum of six series, confirm that the theoretical description of surface states in the anisotropic organic conductors is essentially correct in its numerical aspects. These studies will be very helpful for analyzing and explaining the experimental curves and for their comparison with the theoretical results. Since there are yet no experimental data on surface impedance oscillations in quasi-two dimensional organic conductors with this work we would like to shed new light on this problem in order to motive new research in that direction mostly because of a need of such studies for a possible utilization of surface effects in the existing organic devices.</jats:p>