Nikolay Kalanda
Vitalii Turchenko
Dmitry Karpinsky
Sergey Demyanov
Marta Yarmolich
Maria Balasoiu
Nicoleta Lupu
Sergey Tyutyunnikov
Nikolai A. Sobolev
2019-05-19
<p>Single-phase Sr2FeMoO6-δ powders with various oxygen indices (δ) and degrees of the superstructural ordering (P) of the Fe/Mo cations were obtained from SrFeO2.52 and SrMoO4 reagents via solid-state synthesis. It has been established by means of the x-ray and neutron diffraction that, upon reducing the oxygen content and enhancing the superstructural ordering, the lengths of the Fe–O1 and Mo–O2 bonds in the crystal lattice increase, whereas the Fe–O2 and Mo–O1 bond lengths decrease. At the same time, the volume of the unit cell is reduced, which indicates an enhancement of the covalency degree of the bonds and stimulates a redistribution of the electron density, as well as an increase of the concentration of the spin-down charge carriers located in the conduction band on the Mo(t2g)↓ orbitals. This circumstance leads to an increase of the density of states at the Fermi level, accompanied by an amplification of the exchange interaction and elevation of the Curie temperature, which points to the leading role of the spin-polarized charge carriers at the Fermi level in the exchange interaction. </p>
https://doi.org/10.5281/zenodo.3691782
oai:zenodo.org:3691782
eng
Zenodo
https://doi.org/10.1002/pssb.201800278
https://zenodo.org/communities/eu
https://doi.org/10.5281/zenodo.3691781
info:eu-repo/semantics/openAccess
Creative Commons Attribution 4.0 International
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strontium ferromolybdate
superstructural ordering
oxygen non-stoichiometry
neutron diffraction
magnetization
The role of the Fe/Mo cations ordering degree and oxygen non-stoichiometry on the formation of the crystalline and magnetic structure of Sr2FeMoO6‒δ
info:eu-repo/semantics/article