SERGII M. POPEREZHAI

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Science of Ukraine 47 Nauky Ave., Kharkiv, 61103 Ukraine
Telephone	+38(097) 614-27-15 (mobile)
E-mail	poperegay@ilt.kharkov.ua

PERSONAL DATA

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Name	SERGII MYKOLAYOVYCH POPEREZHAI
Date of birth	19/04/1986
Place of birth	Kharkiv, Ukraine
Residence	UKRAINE
Languages:	Russian, Ukrainian,English (spoken, read and written)

EDUCATION

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Name of Institution	Degrees	Field
Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, Kharkiv	Ph.D. in Solid State Physics (2021)	Magnetism
Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, Kharkiv	Post-Graduate (2008-2011)	Magnetism
Kharkiv State University, Department of Physics	M.Sc. in Physics (2008)	Magnetism

FIELD OF SCIENTIFIC INTEREST

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• Magnetic phenomena.
• Magnetoelectrics.
• IR and EPR-spectroscopy of rare earth compounds.
• Magneto- and electro-optics.
• Spontaneous and induced phase transitions in solids.
• Magnetic field-induced structural phase transitions.
• Dynamics of crystal lattice.

FIELD OF SCIENTIFIC INTEREST

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• 2024-present: Research Fellow in the Department of Magnetism; B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine,  Kharkiv, Ukraine
  
• 2020-2024: Junior Research Fellow in the Department of Magnetism; B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine,  Kharkiv, Ukraine
  
• 2011-2020: Junior Research Fellow in the Department of Optical and Magnetic Properties of Solids; B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine,  Kharkiv, Ukraine
  
• 2008-2011: PhD student in the Department of Optical and Magnetic Properties of Solids; B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, Kharkiv, Ukraine
  
• 2008: Engineer in the Department of Optical and Magnetic Properties of Solids; B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, Kharkiv, Ukraine
  

PUBLICATIONS

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Number of papers : 64 ( in the refereed journals - 14).

Selected Publications for last 10 years:

1. The Pockels effect in НоAl₃(BO₃)₄

   V.A. Bedarev, D.N. Merenkov, S.N. Poperezhai

   Functional Materials, V. 32, P.197-202, (2025)




2. Structure refinement, ferroelectric domains and mechanical properties of Czochralski-grown Ca₉La(VO₄)₇ and Ca₁₀Li(VO₄)₇ single crystals

   V.A. Bedarev, M.B. Kosmyna, P.V. Mateychenko, D.N. Merenkov, W. Paszkowicz, S.N. Poperezhai, A. Fitch, P. Romanowski, A.N. Shekhovtsov

   Functional Materials, V. 31, P. 487-494 (2024)




3. Massive magnetostriction of paramagnetic insulator KEr(MoO₄)₂ via a single-ion effect

   B. Bernath, K. Kutko, S. ;Wiedmann, O. Young, H. Engelkamp, P.C.M. Christianen, S. Poperezhai, L.V. Pourovskii, S. Khmelevskyi, D. Kamenskyi

   Adv. Electron. Mater, 8, 3, 2100770 (7pp), (2022)




4. Low-temperature magnetic susceptibility of ErAl₃(BO₃)₄ single crystal: evidence of antiferromagnetic spin-spin correlations

   D.N. Merenkov, V.A. Bedarev, S.N. Poperezhai, Yu.A. Savina, T. Zajarniuk and A. Szewczyk

   Low Temperature Physics, V. 48, P. 524-529 (2022)




5. Manifestation of spin correlations in monocrystalline ErAl₃(BO₃)₄

   V.A. Bedarev, D.N. Merenkov, M.I. Kobets, A.A. Zvyagin, S.N. Poperezhai, S.L. Gnatchenko, T. Zajarniuk, T. Vasevych, M.U. Gutowska, A. Szewczyk, I.A. Gudim

   Low Temperature Physics, V. 45, P. 1041, (2019)




6. Features of electronic paramagnetic resonance in the ErAl₃(BO₃)₄ single crystal

   V.A. Bedarev, D.N. Merenkov, M.I. Kobets, S.N. Poperezhaj, S.L. Gnatchenko, I.A. Gudim

   Low Temperature Physics V. 44, 8, P. 863-865, (2018)




7. Observation of spontaneous ferriquadrupolar order in KDy(MoO₄)₂

   A.A. Zvyagin, K. Kutko, D. Kamenskyi, A.V. Peschanskii, S. Poperezhai, N.M. Nesterenko

   Phys. Rev. B 98, 064406(5pp), (2018)




8. IR reflection and absorption spectra in CsDy(MoO₄)₂ at cooperative Jahn–Teller effect

   V.I. Kutko, N.M. Nesterenko, N.S. Zubenko, S.N. Poperezhai, K.V. Kutko, A.V. Eremenko

   Low Temperature Physics, 44, 2, 148 (9pp), (2018)




9. Terahertz lattice dynamics of the alkali rare-earth binary molybdates

   S. Poperezhai, P. Gogoi, N. Zubenko, K. Kutko, V.I. Kutko, A.S. Kovale, D. Kamenskyi

   Journal of Physics: Condensed Matter, 29, 9, 095402 (6pp), (2017)