Department of Magnetism

Raman and Brillouin spectroscopy group





Members of the group:

  • Gnezdilov V.P.,Head of the group, Doctor of Sciences,  leading researcher; 

  • Peschanskii A.V., Candidate of Sciences (Ph.D), senior researcher.


The main field of research:


  • Dynamics of a crystal lattice.

  • Structural and magnetic phase transitions in multiferroics.

  • Light scattering on spin waves in low-dimensional and frustrated magnetic structures.

  • Lattice, charge, spin and orbital degrees of freedom determining the unique properties of metal-oxide compounds.

  • Structural and electronic phase separation.


Equipment:


  • Raman Jobin-Yvon U-1000 spectrometer.

  • Brillouin Burleigh RC-11 spectrometer.

  • Cryogenic equipment (2 - 300 K).

  • Magnetic field up to 3 T.


Experimental setup for Raman spectroscopy in solids, liquids and gases.



Experimental setup for Brillouin spectroscopy



The most important results:


  • Research of influence of incommensurable charge stripe-ordering on phonon and magnon spectra in low-dimensional nickelates.

  • Detection of interaction of structural and electronic phase separation in oxygen doped lanhtanum cuprate.

  • Detection of effect of huge phonon softening in doped manganites below metal-insulator transition temperature.

  • Detection of anomalous electronic Raman scattering in layered cobaltites NaxCoO2·yH2O.

  • Research of interraction between lattice and spin degrees of freedom in frustrated spin-chain compounds NaCu2O2 and α-TeVO4.

  • Detection of a fluctuating spin-state phase and a wipeout of the low-frequency phonon-scattering intensity under the influence of temperature and electromagnetic radiation in spin-crossover system [Fe(pmd)(H2O){Au(CN)2}2]·H2O.

  • It is established that the spin state of iron is the control parameter of iron-containing high temperature superconductors.

  • It was established that Fe2O(SeO3)2 oxoselenide is a topological magnetic material with unique energy characteristics, which is an ideal candidate for modern magnonics devices.


International cooperation:


  • Moscow State University, Moscow, Russia;

  • Institute For Condensed Matter Physics, TU Braunschweig, Braunschweig, Germany;

  • Chung-Ang University, Seoul, Korea;

  • Institute of Applied Physics of the Moldavian Academy of Sciences, Kishinev, Moldova;

  • Institute of Solid State Physics and Semiconductors of the Belarus Academy of Sciences, Minsk, Belarus;

  • Institute for Microstructural Science Sciences National Research Council of Canada, Ottawa, Canada.