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Published May 19, 2019 | Version Author Accepted Manuscript
Journal article Open

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

  • 1. Scientific-Practical Materials Research Centre of the NAS of Belarus, 220072 Minsk, Belarus
  • 2. I.M. Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russia & A.A. Galkin Donetsk Institute for Physics and Engineering, 83114 Donetsk, Ukraine
  • 3. I.M. Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russia & Horia Hulubei National Institute for Physics and Nuclear Engineering, Bucharest, Romania
  • 4. National Institute of Research and Development for Technical Physics, Iasi, Romania
  • 5. V.I. Veksler and A.M. Baldin Laboratory of High Energy Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russia
  • 6. Departamento de Física and I3N, Universidade de Aveiro, 3810-193 Aveiro & Portugal, National University of Science and Technology MISiS, 119049 Moscow, Russia

Description

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. 

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Kalanda et al (AAM) - Phys. Status Solidi B 2019, 256, 1800278.pdf

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Journal article: 10.1002/pssb.201800278 (DOI)

Funding

SPINMULTIFILM – Physical principles of the creation of novel SPINtronic materials on the base of MULTIlayered metal-oxide FILMs for magnetic sensors and MRAM 778308
European Commission