Department of Magnetism

Group of microwave and infrared spectroscopy



Group staff:

  1. Kurnosov V.S., Candidate of Science (Ph.D.), senior researcher, head of group;
  2. Yeremenko A.V., Candidate of Science (Ph.D.), senior researcher;
  3. Tsapenko V.V., Candidate of Science (Ph.D.), researcher.

Main research directions:

  • mechanisms of the influence of magnetic ordering of a medium on the formation of its low-energy excitation spectrum;
  • structural and magnetic phase transitions in multisublattice magnets;
  • optical properties of frustrated magnetic structures;

The most important results:

  • detection of one-phonon light absorption and scattering in crystals induced by the Brillouin zone reduction during magnetic ordering;
  • detection of the phonon mechanism of antistockes excitation of a photoluminescence in CsMnCl3•2H2O single crystal with chain-like structure;
  • detection of the resonance interaction between phonon modes from the center and boundary of the paramagnetic Brillouin zone in magnetically ordered phase of CsFeCl3•2H2O crystal;
  • detection of the influence of a stripe charge ordering on the formation of spectra of phonons and magnons in low-dimensional nickelates;

Equipment:
Experimental equipment allows to carry out investigation of absorption spectra in near-millimeter and far infrared ranges of wavelengths. Temperature range extends from room to 2.8 K; magnetic fields are up to 30 and 250 kOe for permanent and pulse solenoids, respectively.

Available equipment:
  • low-temperature (2.8 – 78 K) wide-band millimeter (0.2 – 10 mm) spectrometer equipped with quasi-optical measurement cell, pulse solenoid (magnetic field up to 250 kOe), and high-sensitive detector of irradiation (n-InSb, 4.2 K);
  • FTIR spectrometer (0.02-0.2 mm) equipped with wide-temperature measurement cell (4.2-300 K) and superconducting solenoid (magnetic field up to 30 kOe).

Recent publications:

  1. Ю.Г. Пашкевич, В.В. Пишко, В.В. Цапенко, А.В. Еременко. Индуцированное магнитным упорядочением однофононное инфракрасное поглощение в Nd2CuO4, ЖЭТФ, 109, № 4, с. 1433, 1996. (JETP, 82, N 4, pp. 773 - 790, 1996.)
  2. Yu.G. Pashkevich, V.A. Blinkin, V.P. Gnezdilov, V.V. Tsapenko, V.V. Eremenko, P. Lemmens, M. Fischer, M. Grove, G. Güntherodt, L. Degiorgi, P. Wachter, J.M. Tranquada, and D.J. Buttrey. Stripe Conductivity in La1.775Sr0.225NiO4, Phys. Rev. Letters, 84, N 17, pp. 3919 - 3922, 2000.
  3. Yu.G. Pashkevich, V.A. Blinkin, V.P. Gnezdilov, V.S. Kurnosov, V.V. Tsapenko, V.V. Eremenko, P. Lemmens, M. Fischer, M. Grove, G. Güntherodt, L. Degiorgi, P. Wachter, J.M. Tranquada, D.F. Buttrey. Optical studies of the incommensurate charge ordered phase in La1.775Sr0.225NiO4, Physica B, 284-288, pp. 1473 - 1474, 2000.
  4. V.S. Kurnosov, Yu.G. Pashkevich, A.V. Peschanskii, V.I. Fomin, and A.V. Yeremenko. Light scattering on the phonons in quasi-one-dimensional antiferromagnet CsFeCl3·2H2O induced by magnetic ordering, ФНТ, 28, № 7, с. 724 - 732, 2002. (Low Temp. Phys., 28, N 7, pp. 516 - 522, 2002.)
  5. V.V. Pishko, S.L. Gnatchenko, V.V. Tsapenko, R.H. Kodama, S.A. Makhlouf. Temperature dependence of magnetic resonance in NiO nanoparticles, J. Appl. Phys., 93, N 10, pp. 7382 - 7384, 2003.
  6. И.А. Господарев, А.В. Еременко, Т.В. Игнатова, Г.В. Камарчук, И.Г. Колобов, П.А. Минаев, Е.С. Сыркин, С.Б. Феодосьев, В.Д. Филь, A. Soreau-Leblanc, P. Molinie, and E.C. Faulques. Упругие свойства и фононные спектры квазидвумерного VSe2, ФНТ, 29, №2, с. 205 - 210, 2003.(Low Temp. Phys., 29, N 2, pp. 151 - 154, 2003.
  7. V.V. Eremenko, V.I. Fomin, V.P. Gnezdilov, V.S. Kurnosov, A.V. Peschanskii. Comparative Raman scattering study of optical excitations in the magnetoelectric LiNiPO4. Magnetoelectric Interaction Phenomena in Crystals, M.Feibig et al. (eds.), Kluwer Academic Publishers, pp. 219 - 226, 2004.
  8. V. Gnezdilov, V. Kurnosov, Yu. Pashkevich, P. Lemmens, J. Tranquada, K.-Y. Choi, G. Günterodt, K. Nakajima, A. Yeremenko. Phonons and magnons in stripe-ordered nickelates. A Raman scattering study, ФНТ, 31, № 2, с. 205 - 212, 2005. (Low Temp. Phys., 31, N 2, pp. 154 - 160, 2005.)
  9. V.S. Kurnosov, A.V. Peschanskii, V.I. Fomin, A.V. Yeremenko. Brillouin scattering study of orthorhombic LiNiPO4 single crystal, Phys. Stat. Sol. (a), 203, N 15, pp. 3805 - 3815, 2006.
  10. В.С. Курносов, В.В. Пишко, В.В. Цапенко, Длинноволновый ИК спектр двойных слоистых редкоземельных манганитов Pr1,2Sr1,8Mn2O7 и Nd1,2Sr1,8Mn2O7, ФНТ, 33, № 10, с. 1147-1158, 2007. (Low Temp. Phys., 33, N 10, pp. 872 - 880, 2007.)