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Department of Optical and Magnetic Properties of Solids

B.Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine

Sergii Poperezhai



Phone: +38(057)341-08-46, 2-01 (local)
Room: 225 (lab.)
e-mail: poperegay@ilt.kharkov.ua




Academic degrees:

2008 Master Degree in Physics, Physics faculty. - V.N. Karazin Kharkiv National University, Kharkiv, Ukraine. (ILTPE NASU, Diploma thesis title: "Low power excitation spectrum of crystal KTm(MoO4)2". Supervisor: Prof. V.I. Kutko).

Professional career:

Since 11/2011 Junior researcher - Department of optical and magnetic properties of solids at B.Verkin Institute for Low Temperature Physics and Engineering of the NAS of Ukraine, Kharkiv, Ukraine.
11/2008 - 10/2011 PhD student - B.Verkin Institute for Low Temperature Physics and Engineering, Kharkiv, Ukraine. Supervisor: Prof. V.I. Kutko.
09/2003 - 07/2008 Student of the Physics faculty, V.N. Karazin Kharkiv National University, Kharkiv, Ukraine.

Research Activity:

  • Visible and IR-spectroscopy of rare earth compounds, spontaneous and magnetic field induced structural phase transitions in layered compounds with rare earth Jahn-Teller ions, dynamics of the crystal lattice.

Main Publications:

  1. A.A. Zvyagin, K. Kutko, D. Kamenskyi, A.V. Peschanskii, S. Poperezhai, N.M. Nesterenko, "Observation of spontaneous ferriquadrupolar order in KDy(MoO4)2", Phys. Rev. B 98, 2018, 064406(5pp).
  2. S. Poperezhai, P. Gogoi, N. Zubenko, K. Kutko, V.I. Kutko, A.S. Kovalev, D. Kamenskyi, "Terahertz lattice dynamics of the alkali rare-earth binary molybdates", Journal of Physics: Condensed Matter, 2017, Vol.29, p. 095402.
  3. S.M. Poperezhai, N.S. Bondar, V.I.Kut’ko, A.S. Kovalev, "Low-frequency elastic vibrations of the crystal CsDy(MoO4)2", Fiz. Nizk. Temp, 2014, Vol.40, p. 1093.
  4. D. Kamenskyi, S. Poperezhai, P. Gogoi, H. Engelkamp, J. C. Maan, J. Wosnitza, V. Kut’ko, "Interaction of electronic excitations of Tm3+ ions with acoustic vibrations in KTm(MoO4)2", Phys. Rev. B 89, 2014, 014410(5pp).