Vladimír Tkáč

Academic degrees:

•     Scientific qualification degree IIa - 2019
•     PhD. - 2014
•     RNDr. - 2012
•     Mgr. - 2010
•     Bc. - 2008

Professional career:

•     2024 – present –  Deputy Director for education of the Institute of Physical Sciences, PF UPJŠ
•     2019 – present –  Senior researcher at PF UPJŠ
•     2016 – 2019 – Researcher at PF UPJŠ
•     2014 – 2016 – Postdoctoral stay at the Department of Condensed Matter Physics, Charles University, Faculty of Mathematics and Physics, Prague
•     2010 – 2014 – Doctoral studies – Condensed Matter Physics and Acoustics (Faculty of Natural Sciences, Pavol Jozef Šafárik University)
•     2008 – 2000 – Master's studies – Condensed Matter Physics (Faculty of Natural Sciences, Pavol Jozef Šafárik University)
•     2005 – 2008 – Bachelor's studies – Physics (Faculty of Natural Sciences, Pavol Jozef Šafárik University)

Awards:
 

•     2025 - 1st prize from the Director of the Faculty of Physics, UPJŠ, for the best scientific publication of 2024
•     2020 - 3rd prize in the 2020 Young Physicists Competition for the best scientific work created in the last 5 years
•     2020 - 1st prize from the Director of ÚFV PF UPJŠ for the best scientific publication of 2019
•     2018 - 1st prize in the 2018 Young Physicists Competition for the best scientific work created in the last 5 years
•     2017 - Prize for the best poster (3rd place) at The European Conference, Physics of Magnetism 2017 (PM'17), Poznań, Poland, June 26-30, 2017.
•     2014 - Award for poster presentation at The European Conference, Physics of Magnetism 2014 (PM'14), Poznań, Poland, June 23–27, 2014.
•     2014 - Award from the Dean of the Faculty of Natural Sciences, UPJŠ, for scientific and research activities of doctoral students.
•     2012 - Award for the best presentation in the section "Low temperature magnetism, spintronics" at the III International Conference for Young Scientists, LOW TEMPERATURE PHYSICS (ICYS–LTP–2012), May 14–18, 2012, Kharkiv.
•     2008 - Second place in the national round of the Student Scientific Conference, experimental physics section, Bratislava.

Study abroad:

•     2014–2016 – Postdoctoral fellowship at the Department of Condensed Matter Physics, Charles University, Faculty of Mathematics and Physics, Prague
•     August 25, 2013 – September 3, 2013 – Cryocourse 2013, Summer School of Low Temperature Physics, Institut Néel, CNRS-Grenoble, France.

Teaching:

•     Electronics
•     Electronic practical training
•     Computer simulations in magnetochemistry

Publications:

• V. Tkáč, Y.G. Pashkevich, E.L. Fertman, R. Tarasenko, E. Čižmár, A. Feher, A.V. Fedorchenko, C.S. Neves, D.E.L. Vieira, A.N. Salak: Combined effect of 2D nature and structural glass behaviour and true magnetic contribution to the low-temperature heat capacity of layered double hydroxides, Applied Clay Science 266 (2025) 107695 https://doi.org/10.1016/j.clay.2024.107695
• V. Tkáč, S. Vorobiov, P. Baloh, M. Vondráček, G. Springholz, K. Carva, P. Szabó, P. Hofmann, J. Honolka: Multiphase superconductivity at the interface between ultrathin FeTe islands and Bi2Te3, NPJ 2D Materials and Applications 8 (2024) 52.
  https://www.nature.com/articles/s41699-024-00480-x
• P. Baloh, V. Tkáč, R. Tarasenko, M. Orendáč, A. Orendáčová, O. Mitsa, V. Mitsa, R. Holomb, A. Feher: The interplay between the topology of nanoclusters and the characteristic of boson peak in As-S glasses, Journal of Non-Crystalline Solids 631 (2024) 122913.
  https://doi.org/10.1016/j.jnoncrysol.2024.122913
• Y.G. Pashkevich, E.L. Fertman, A.V. Fedorchenko, D.E.L. Vieira, C.S. Neves, R.Y. Babkin, A.А. Lyogenkaya, R. Tarasenko, V. Tkáč, E. Čižmár, A. Feher, A.N. Salak: Magnetic ordering in Co2+-containing layered double hydroxides via the low-temperature heat capacity and magnetisation study, Applied Clay Science 233 (2023) 106843.
  https://doi.org/10.1016/j.clay.2023.106843
• P. Baloh, V. Tkáč, R. Tarasenko, M. Orendáč, A. Orendáčová, O. Mitsa, V. Mitsa, R. Holomb, A. Feher: Relation between nanocluster approximation and Soft-Potential Model, the role of keystone nanocluster in the thermal conductivity, Journal of Non-Crystalline Solids 600 (2023) 122040.
  https://doi.org/10.1016/j.jnoncrysol.2022.122040
• P. Danylchenko, R. Tarasenko, A. Orendáčová, J. Strečka, E. Čižmár, V. Tkáč, M. Orendáč: Magnetic properties of Cu[C6H2(COO)4][H3N–(CH2)2–NH3]·3H2O – A quasi-two-dimensional S = 1/2 antiferromagnet on rectangular lattice, Journal of Physics and Chemistry of Solids 182 (2023) 111613.
  https://doi.org/10.1016/j.jpcs.2023.111613
• R. Tarasenko, P. Danylchenko, V. Zeleňák, V. Girman, E. Čižmár, V. Tkáč, I. Kozin, S. Vorobiov, O. Onufriienko, A. Orendáčová, M. Orendáč : Experimental study of Cu(en)(H2O)2SO4 embedded into mesoporous silica matrix SBA-15 with the hexagonal arrangement of pores, Journal of Magnetism and Magnetic Materials 588 (2023) 171396.
  https://doi.org/10.1016/j.jmmm.2023.171396
• P. Baloh, V. Tkáč, R. Tarasenko, E. Čižmár, M. Orendáč, A. Orendáčová, O. Onufriienko, J. Holubová, E. Černošková, Z. Černošek, A. Feher : Thermodynamic properties of the phosphate glass Dy(PO3)3 – Potential influence of boson peak on spin relaxation, Journal of Magnetism and Magnetic Materials 588 (2023) 171415.
  https://doi.org/10.1016/j.jmmm.2023.171415
• V. Tkáč, R. Tarasenko, A. Doroshenko, V. Kavečanský, E. Čižmár, A. Orendáčová, R. Smolko, J. Černák, M. Orendáč :Reciprocating thermal behavior in a magnetic field induced slow spin relaxation of [Gd2(H2O)6(C2O4)3]∙2.5H2O, Solid State Sciences 136 (2023) 107105.
  https://doi.org/10.1016/j.solidstatesciences.2022.107105
• E. Tóthová, R. Tarasenko, V. Tkáč, M. Orendáč, M. Baláž, M. Senna, S. Kubuki, M. Takahashi, P. Švec, P. Švec sr, V. Girman: Improved mechanically induced synthesis of nanocrystalline gadolinium oxymolybdate, Journal of Solid State Chemistry 315 (2022) 123500.
  https://doi.org/10.1016/j.jssc.2022.123500
• V. Tkáč, R. Tarasenko, E. Čižmár, A. Orendáčová, K. Tibenská, J. Holubová, E. Černošková, Z. Černošek, M. Orendáč: Spin relaxation in 3Zn(PO3)2·2Mn(PO3)2 phosphate glass – The role of low-energy vibrational modes, Journal of Alloys and Compounds 851 (2021) 156910.
  https://doi.org/10.1016/j.jallcom.2020.156910
• V. Tkáč, E. Tothová, K. Tibenská, A. Orendáčová, M. Orendáč, R. Tarasenko: Magnetocaloric properties of Gd2MoO6 prepared by a simple and fast method, Ceramics International 47 (2021) 24421-24429.
  https://doi.org/10.1016/j.ceramint.2021.05.157
• D. Kamenskyi, V. Tkáč, E. Čižmár, V. Khrustalyov, K. Kutko: Magnetic anisotropy in CsGd(MoO4)2 probed by EPR spectroscopy, Journal of Physics: Condensed Matter 32 (2020) 385801.
  https://doi.org/10.1088/1361-648X/ab940b
• R. Tarasenko, P. Danylchenko, V. Tkáč, A. Orendáčová, E. Čižmár, M. Orendáč, A. Feher: Experimental study of the magnetocaloric effect in [Ni(fum)(phen)] – The ferromagnetic dimer with spin 1, Physica B 576 (2020) 411671.
  https://doi.org/10.1016/j.physb.2019.411671
• R. Holomb,V. Tkáč, V. Mitsa, A. Feher, M. Veres: Structural Nature of Boson Peak and Low-Temperature Heat Excess in As2S3 Glass, Physica Status Solidi (B) 257 (2020) 1900525.
  https://doi.org/10.1002/pssb.201900525
• V. Tkáč, R. Tarasenko, E. Tóthová, Z. Bujňáková, K. Tibenská, A. Orendáčová, V. Sechovský, M. Orendáč: Relaxation phenomena and magnetocaloric effect in the dynamic spin ice Pr2Sn2O7, Journal of Alloys and Compounds 808 (2019) 151719.
  https://doi.org/10.1016/j.jallcom.2019.151719
• V. Tkáč, K. Výborný, V. Komanický, J. Warmuth, M. Michiardi, A. S. Ngankeu, R. Tarasenko, M. Vališka, V. Stetsovych, K. Carva, I. Garate, M. Bianchi, J. Wiebe, V. Holý, P. Hofmann, G. Springholz, V. Sechovský, J. Honolka: Influence of an anomalous temperature-dependence of the phase coherence length on the conductivity of magnetic topological insulators. Physical Review Letters 123, 036406 (2019).
  arXiv:1806.10014
• A. Orendáčová, R. Tarasenko, V. Tkáč, E. Čižmár, M. Orendáč, A. Feher: Interplay of Spin and Spatial Anisotropy in Low-Dimensional Quantum Magnets with Spin 1/2. Crystals 9,6 (2019).
• A. Orendáčová, R. Tarasenko, V. Tkáč, E. Čižmár, M. Orendáč, A. Feher: Interplay of Spin and Spatial Anisotropy in Low-Dimensional Quantum Magnets with Spin 1/2. Molecular Magnets ISBN 978-3-03897-710-0 (Pbk); ISBN 978-3-03897-711-7 (PDF) , 4-30 (2019).
• E. Tothova, R. Tarasenko, V. Tkáč, M. Orendáč, M. Hegedüs, Z. Danková, M. Holub, M. Baláž, M. Matik: Microcrystalline Gd2MoO6 prepared by combined mechanochemical/thermal process and its magnetic properties. Journal of Materials Science 54, 6111 (2019).
• V. Tkáč, R. Tarasenko, E. Tóthová, Z. Bujňáková, K. Tibenská, A. Orendáčová, V. Sechovský, M. Orendáč: Relaxation phenomena and magnetocaloric effect in dynamic spin ice Pr2Sn2O7. Journal of Alloys and Compounds 808, 151719 (2019).
• K. Uhlířová, N. Miura, V. Tkáč, J. Prokleška, M. Chrobak, Z. Tarnawski, H. Hidaka, T. Yanagisawa, V. Sechovský, H. Amitsuka: Superconductivity in single crystalline ThBe13 and LuBe13. Physica B: Condensed Matter 536, 516 (2018).
• R. Tarasenko, V. Tkáč, A. Orendáčová, M. Orendáč, J. Valenta, V. Sechovský, A. Feher: Experimental study of magnetocaloric effect in the two-level quantum system KTm(MoO4)2. Physica B: Condensed Matter 536, 450 (2018).
• V. Tkáč, R. Tarasenko, A. Orendáčová, M. Orendáč, V. Sechovský, A. Feher: Magnetocaloric effect and slow magnetic relaxation in CsGd(MoO4)2 induced by crystal-field anisotropy. Physica B: Condensed Matter 536, 401 (2018).
• R. Tarasenko, V. Tkáč, A. Orendáčová, M. Orendáč, A. Feher: Experimental study of the rotational magnetocaloric effect in KTm(MoO4)2. Physica B 538, 116 (2018).
• V. Tkáč, A. Orendáčová, R. Tarasenko, M. Orendáč , A. Feher: Slow Magnetic Relaxation in the Highly Anisotropic Layered Crystal CsNd(MoO₄)₂. Acta Physica Polonica A 133, 466 (2018).
• R. Tarasenko, V. Tkáč, A. Orendáčová, M. Orendáč, V. Sechovský, A. Feher: Magnetocaloric Effect in CsDy(MoO₄)₂. Acta Physica Polonica A 133, 414 (2018).
• V. Tkáč, A. Orendáčová, R. Tarasenko, M. Orendáč, A. Feher: Impact of the crystal electric field on magnetocaloric properties of CsGd(MoO4)2. Journal of Alloys and Compounds 729, 323 (2017).
• M. Orendáč, R. Tarasenko, V. Tkáč, A. Orendáčová, V. Sechovský: Specific heat study of the magnetocaloric effect in the Haldane-gap S=1 spin-chain material [Ni(C2H8N2)2NO2](BF4). Phys. Rev. B 96, 094425 (2017).
• P. Opletal, J. Prokleška, J. Valenta, P. Proschek, V. Tkáč, R. Tarasenko, M. Běhounková, Š. Matoušková, M. M. Abd-Elmeguid and V. Sechovský: Quantum ferromagnet in the proximity of the tricritical point. npj Quantum Materials 2, 29 (2017).
• V. Mitsa, A. Feher, S. Petretskyi, R. Holomb, V. Tkáč, A, P. Ihnatolia, A. Laver: Hysteresis of Low-Temperature Thermal Conductivity and Boson Peak in Glassy (g) As2S3: Nanocluster Contribution. Nanoscale Research Letters 12, 345 (2017).
• V. Tkáč, A. Orendáčová, L'. Dlháň, M. Orendáč, R. Boča, A. Feher: Magnetic-Field Induced Slow Relaxation in the Ising-Like Quasi-One-Dimensional Ferromagnet KEr(MoO4)2. Acta Physica Polonica A 131, 893 (2017).
• L. Lederová, A. Orendáčová, J. Chovan, J. Strečka, T. Verkholyak, R. Tarasenko, D. Legut, R. Sýkora, E. Čižmár, V. Tkáč, M. Orendáč, and A. Feher: Realization of a spin-1/2 spatially anisotropic square lattice in a quasi-two-dimensional quantum antiferromagnet Cu(en)(H2O)2SO4. Phys. Rev. B 95, 054436 (2017).
• N.-T.H. Kim-Ngana, M. Paukov, R. Tarasenko, V. Tkáč, P. Minarik, D. Drozdenko, L. Havela: γ-U phase in U-Pt system retained to low temperatures by means of rapid cooling. J. Nucl. Mater. 479, 287 (2016).
• M. Orendáč, K. Tibenská, E. Čižmár, V. Tkáč, A. Orendáčová, J. Holubová, Z. Černošek, E. Černošková: Magnetic relaxation in Zn(PO3)2·Er(PO3)3 glass. J. Magn. Magn. Mater. 412, 83 (2016).
• L. Baranová, A. Orendáčová, E. Čižmár, R. Tarasenko, V. Tkáč, M. Orendáč, A. Feher: Fingerprints of field-induced Berezinskii–Kosterlitz–Thouless transition in quasi-two-dimensional S=1/2 Heisenberg magnets Cu(en)(H2O)2SO4 and Cu(tn)Cl2. J. Magn. Magn. Mater. 404, 53 (2016).
• K. Carva, J. Kudrnovský, F. Máca, V. Drchal, I. Turek, P. Baláž, V. Tkáč, V. Holý, V. Sechovský, J. Honolka: Electronic and transport properties of the Mn-doped topological insulator Bi2Te3: A first-principles study. Phys. Rev. B 93, 214409 (2016).
• M. Orendáč, K. Tibenská, J. Strečka, J. Čisárová, V. Tkáč, A. Orendáčová, E. Čižmár, J. Prokleška, V. Sechovský: Cross-tunneling and phonon bottleneck effects in the relaxation phenomena of XY pyrochlore antiferromagnet Er2Ti2O7. Phys. Rev. B 93, 024410 (2016).
• R. Tarasenko, M. Vališka, M. Vondráček, K. Horáková, V. Tkáč, K. Carva, P. Baláž, V. Holý, G. Springholz, V. Sechovský, J. Honolka: Magnetic and structural properties of Mn-doped Bi2Se3 topological insulators. Physica B 481, 262 (2016).
• M. Kratochvílová, J. Prokleška, K. Uhlířová, V. Tkáč, M. Dušek, V. Sechvský: Coexistence of Antiferromagnetism and Superconductivity in Heavy Fermion Cerium Compound Ce3PdIn11. Scientific Reports 5, 15904 (2015).
• V. Tkáč, A. Orendáčová, E. Čižmár, M. Orendáč, A. Feher, G. Anders: Giant reversible rotating cryomagnetocaloric effect in KEr(MoO4)2 induced by a crystal-field anisotropy. Phys. Rev. B 92, 024406 (2015).
• V. Tkáč, A. Orendáčová, R. Tarasenko, D. M. Pajerowski, E. Čižmár, M. Orendáč, A. G. Anders, M. W. Meisel, A. Feher: Magnetic Field Induced Slow Magnetic Relaxation in KEr(MoO4)2. Acta Physica Polonica A 127, 353(2015).
• V. Tkáč, K. Tibenská, A. Orendáčová, M. Orendáč, J. Šebek, A. G. Anders,V. Pavlík, A. Feher: The Rare-earth Based Single-ion Magnet CsNd(MoO4)2. Acta Physica Polonica A 125, 1117 (2014).
• V. Tkáč, A. Orendáčová, E. Čižmár, M. Orendáč, S. Zvyagin, A. G. Anders, V. Pavlík , A. Feher: Experimental study of magnetic anisotropy in a layered CsNd(MoO4)2. J. Alloys Comp. 591, 100 (2014).
• V. Tkáč, A. Orendáčová, E. Čižmár, M. Orendáč, K. Tibenská, A. G. Anders, V. Pavlík , A. Feher: Multiple-time-scale relaxation dynamics in CsGd(MoO4)2 - the dipolar magnet with a highly anisotropic layered crystal structure. J. Phys.: Condens. Matter 25, 506001 (2013).
• V. Tkáč, A. Orendáčová, M. Orendáč, D. Legut, K. Tibenská, A. Feher, M. Poirier, M.W. Meisel: Experimental Study of the Thermal Transport in CsNiF3 - An S = 1 Quantum Chain. Acta Physica Polonica A 121, 1098 (2012).
• V. Tkáč, K. Tibenská, A. Orendáčová, M. Orendáč, J. Šebek, V. Sechovksý, A. G. Anders, V. Pavlík, A. Feher: The influence of the magnetic subsystem on the heat transport in CsMnCl3·2H2O. Phys. Status Solidi B 248, 2834 (2011).
• K. Tibenská, V. Tkáč, A. Orendáčová, M. Orendáč, A. Feher, J. Šebek, V. Sechovský: Thermal Conductivity of Layered CsGd(MoO4)2 Crystal. Acta Physica Polonica A 118, 971 (2010).
• V. Tkáč, K. Tibenská, A. Orendáčová, M. Orendáč, J. Šebek, V. Sechovský, A.G. Anders, A. Feher: Scattering of Phonons in CsMnCl3·2H2O. Acta Physica Polonica A 118, 950 (2010).