179 citations · 543 across the 8 of their papers we have counts for
8 papers
Raman spectroscopy of alpha-FeOOH (goethite) near antiferromagnetic to paramagnetic phase transition
M. V. Abrashev, V. G. Ivanov, B. S. Stefanov +3
Synthetic powder, ore samples and mineral single crystals of goethite (FeOOH) were investigated with polarized Raman spectroscopy at temperatures from 300 K to 473 K. The symme…
Two Dimensional Polymerization of Graphene Oxide: Bottom-up Approach
Victor Atanasov, Stoyan Russev, Lyudmil Lyutov +9
We demonstrate a bottom-up synthesis of structures similar to graphene oxide via a two dimensional polymerization. Experimental evidence and discussion are conveyed as well as a ge…
Short-Range B-site Ordering in Inverse Spinel Ferrite NiFe2O4
V. G. Ivanov, M. V. Abrashev, M. N. Iliev +3
The Raman spectra of single crystals of NiFe2O4 were studied in various scattering configurations in close comparison with the corresponding spectra of Ni0.7Zn0.3Fe2O4 and Fe3O4. T…
Polarized Raman spectroscopy of nearly-tetragonal BiFeO thin films
M. N. Iliev, M. V. Abrashev, D. Mazumdar +2
BiFeO thin films can be epitaxially stabilized in a nearly-tetragonal phase under a high biaxial compressive strain. Here we investigate the polarized Raman spectra of constrai…
Distortion-Dependent Raman Spectra and Mode Mixing in RMnO3 Perovskites
M. N. Iliev, M. V. Abrashev, J. Laverdiere +4
The polarized Raman spectra of orthorhombic RMnO3 series (R=La,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Y) were studied at room temperature. The variation of phonon frequencies with R ionic radius…
Raman and infrared studies of La_1-ySr_yMn_1-xM_xO_3 (M=Cr, Co, Cu, Zn, Sc or Ga): Oxygen disorder and local vibrational modes
A. Dubroka, J. Humlicek, M. V. Abrashev +3
We present results of our study of polarized Raman scattering and infrared reflectivity of rhombohedral ceramic La_1-ySr_yMn_1-xM_xO_3 manganites in the temperature range between 7…