Dielectric relaxation in epitaxial films of paraelectric-magnetic SrTiO.sub.3./sub.-SrMnO.sub.3./sub. solid solution

0489386 - FZÚ 2019 RIV US eng J - Journal Article
Savinov, Maxim - Bovtun, Viktor - Tereshina-Chitrova, Evgenia - Stupakov, Alexandr - Dejneka, Alexandr - Tyunina, Marina
Dielectric relaxation in epitaxial films of paraelectric-magnetic SrTiO₃-SrMnO₃ solid solution.
Applied Physics Letters. Roč. 112, č. 5 (2018), s. 1-4, č. článku 052901. ISSN 0003-6951. E-ISSN 1077-3118
R&D Projects: GA ČR GA15-15123S
Institutional support: RVO:68378271
Keywords : dielectric relaxation * epitaxial films * paraelectric-magnetic * SrTiO₃-SrMnO₃ solid solution
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.521, year: 2018

Magneto-dielectric properties of (A(2+)) MnO3-type perovskites are attractive for applications and stimulate extensive studies of these materials. Here, the complex dielectric and magnetic responses are investigated as in epitaxial films of SrTi0.6Mn0.4O3, solid solution of paraelectric SrTiO3 and magnetic SrMnO3. The impedance and resonance measurements at frequencies of 10(-2)-10(-10) Hz and temperatures of 10-500K reveal broad dielectric anomalies centered at 100-200 K, while the films are paramagnetic at all temperatures. Analysis shows polaronic electrical conductivity behind the observed behavior. Electron-phonon correlations, rather than spin-phonon correlations, are suggested to produce the apparent magneto-dielectric responses in many multiferroic manganites.
Permanent Link: http://hdl.handle.net/11104/0283806