Speaker
Mr
Evgeniy Korotaev
(Nikolaev Institute of Inorganic Chemistry of the Siberian Branch of the Russian Academy of Sciences)
Description
Solid solution containing chemical rare-earth elements (such as Yb or Tm) have a number of unique properties, which is commonly undergo a phase transitions having a purely electron nature and related with the change in filling of 4f electron levels [1, 2] along with magnetic–nonmagnetic state transitions [3]. These systems are also possess thermoelectric properties. Invention of a highly efficient thermoelectric materials is one of the important direction of modern materials science. One of the directions on finding of new thermoelectric materials is the study of systems, in which metal-dielectric transition is observed. The systems of such kind could be solid solutions based on the transition metal sulfides Mn1-xMxS (M=Cu, Fe, Co) and possess high values specific of thermoelectric power [4-5].
Electrophysical properties of such functional matrials is primarily determined by features of its electronic structure. In this regard, current work involves a comprehensive study of the iterlelationship between electronic structure and magnetic properties (i.e. magnetic suspetibility) of the Mn1-xLnxS (Ln=Dy, Tm, Yb; x=0;0.01;0.05). X-ray emission spectra (XES) provides information about the electronic structure of valance band. Х-ray absorption near edge spectroscopy (XANES) provides information about conduction band electronic structure (K-absorbtion spectra of Mn, S; L-spectra of lanthanides). Measurement of the chemical shifts of (Mn, S)Kα1,2-lines and ratio of MnLα1,2-,Lβ- emission spectra allows to determine the charge and the electron density of metal and sulfur atoms in investigated solid solutions. In order to investigate electronic structure XAS and XES spectra figured in unified energy scale. Experemental spectra were compared with quantum chemical calculations in the FDMNES and ADF BAND software packages.
[1] S. S. Aplesnin, O. B. Romanova, A. M. Kharkov, A. I. Galyas, 2015, Phys. Solid State 57 (5), 886.
[2] S. S. Aplesnin, A. M. Harkov, E. V. Eremin, O. B. Romanova, D. A. Balalev, V. V. Sokolov, and A. Yu. Pichugin,IEEE Trans. Magn. 47, 4413 (2011).
[3] D. I. Khomskii, Sov. Phys.—Usp. 22 (10), 879 (1979).
[4] S.S. Aplesnin, O.B. Romanova, A.I. Galyas, V.V. Sokolov, 2016, Phys. of Sol. State, 2016, Vol. 58, No. 1, pp. 21–26.
[5] Abramova G.M. Vorotynov A.M., Petrakovskii G.A. et al. // Phys. of Sol. State, 2004, vol.46, n. 12, p.2225.
[6] G. I. Makovetski , A. I. Galyas, O. F. Demidenko et al. // Phys. of Sol. State, 2008, vol.50, n. 10, p.1826.
Primary author
Mr
Mikhail Syrokvashin
(Institute of Inorganic Chemistry SB RAS, Novosibirsk, Russia)
Co-authors
Mr
Andrey Pichugin
(Institute of Inorganic Chemistry SB RAS, Novosibirsk, Russia)
Mr
Evgeniy Korotaev
(Nikolaev Institute of Inorganic Chemistry of the Siberian Branch of the Russian Academy of Sciences)
