Octahedra-tilted control of displacement disorder and dielectric relaxation in Mn-doped SrTiO.sub.3./sub. single crystals

0567152 - FZÚ 2023 RIV US eng J - Journal Article
Talanov, M.V. - Stash, A.I. - Ivanov, S. A. - Zhukova, E.S. - Gorshunov, B. P. - Nekrasov, B.M. - Stolyarov, V.S. - Kozlov, V.I. - Savinov, Maxim - Bush, A. A.
Octahedra-tilted control of displacement disorder and dielectric relaxation in Mn-doped SrTiO₃ single crystals.
Journal of Physical Chemistry Letters. Roč. 13, č. 50 (2022), s. 11720-11728. ISSN 1948-7185
Institutional support: RVO:68378271
Keywords : insipient ferroelectrics * dielectric spectroscopy * X-ray diffraction
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 5.7, year: 2022
Method of publishing: Limited access
https://doi.org/10.1021/acs.jpclett.2c03513

SrTiO3 (STO) is a canonical example of a quantum paraelectric, and its doping with Mn ions unlocks its potential as a quantum multiferroic candidate. However, to date, the specifics of incorporation of the Mn ion into the perovskite lattice and its impact on structure−property relationships are debatable questions. Herein, using high-precision X-ray diffraction of a Mn (2 atom %)-doped STO single crystal, clear fingerprints of the displacement disorder of Mn cations in the perovskite B-sublattice are observed. Moreover, near the temperature of the antiferrodistortive transition, the off-center Mn position splits in two, providing the unequal potential barrier’s distribution for possible local atomic hopping. A link with this was found via analysis of the dielectric response that reveals two Arrhenius-type relaxation processes with similar activation energies and attempt frequencies, suggesting similar dielectric relaxation mechanisms.
Permanent Link: https://hdl.handle.net/11104/0338819