Dielectric relaxation in epitaxial films of paraelectric-magnetic SrTiO₃-SrMnO₃ solid solution
Savinov, M.; Bovtun, V.; Tereshina-Chitrova, E.; Stupakov, A.; Tyunina, M. (2018-01-29)
Appl. Phys. Lett. 112, 052901 (2018); View online: https://doi.org/10.1063/1.5017667
© 2018 Authors. Published by the American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Applied Physics Letters 112:5 and may be found at https://doi.org/10.1063/1.5017667.
https://rightsstatements.org/vocab/InC/1.0/
https://urn.fi/URN:NBN:fi-fe2019051315381
Tiivistelmä
Abstract
Magneto-dielectric properties of (A²⁺)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 10⁻²–10¹⁰ Hz and temperatures of 10–500 K 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.
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