Pressure-induced spin state crossover in layered cobaltite LaSrCoO.sub.4./sub.

0533537 - FZÚ 2021 RIV NL eng J - Journal Article
Lis, O.N. - Kichanov, S.E. - Kozlenko, D. P. - Jirák, Zdeněk - Belushkin, A.V. - Savenko, B. N.
Pressure-induced spin state crossover in layered cobaltite LaSrCoO₄.
Journal of Magnetism and Magnetic Materials. Roč. 487, Oct (2019), s. 1-5, č. článku 165360. ISSN 0304-8853. E-ISSN 1873-4766
Institutional support: RVO:68378271
Keywords : layered cobaltite * spin state crossover * neutron diffraction * high pressure
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 2.717, year: 2019
Method of publishing: Limited access
https://doi.org/10.1016/j.jmmm.2019.165360

The crystal structure of the tetragonal layered cobalt oxide LaSrCoO4 has been studied by means of neutron diffraction at high pressures up to 5.8 GPa in temperature range 7–300 K. The pressure and temperature behaviour of the lattice parameters, including lattice parameters, unit cell volume, and interatomic bond lengths, have been obtained. The anisotropic compression of lattice parameters as well as Co-O bond lengths of the oxygen octahedra have been revealed. The anomalous thermal volume expansion at high pressure are observed, indicative for the pressure induced spin state crossover of Co3+ ions from the mixed low spin – high spin (LS + HS) state at room temperature towards the low spin (LS) ground state. The structural mechanisms of the spin state crossover are discussed.
Permanent Link: http://hdl.handle.net/11104/0311909