Synthesis and broadband dielectric-infrared spectroscopy of La.sub.1-x./sub.Sr.sub.x./sub.MnO.sub.3./sub.@BaTiO.sub.3./sub. nanocomposite

0545204 - FZÚ 2022 RIV GB eng J - Článek v odborném periodiku
Nuzhnyy, Dmitry - Bovtun, Viktor - Savinov, Maxim - Kempa, Martin - Petzelt, Jan - Kaman, Ondřej - Klementová, Mariana - Kuličková, Jarmila - Jirák, Zdeněk
Synthesis and broadband dielectric-infrared spectroscopy of La_1-xSr_xMnO₃@BaTiO₃ nanocomposite.
Materials Research Bulletin. Roč. 144, Dec (2021), č. článku 111459. ISSN 0025-5408. E-ISSN 1873-4227
Grant CEP: GA MŠMT(CZ) EF16_019/0000760; GA ČR(CZ) GA21-06802S; GA MŠMT(CZ) LM2018096; GA MŠMT LM2018110
Grant ostatní: OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institucionální podpora: RVO:68378271
Klíčová slova: core-shell multiferroic nanocomposite * DC resistance and magnetoresistance * broadband dielectric spectroscopy * effective medium modelling
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 5.600, rok: 2021
Způsob publikování: Omezený přístup
https://doi.org/10.1016/j.materresbull.2021.111459

The study deals with design, structural and magnetic characterization, electric and magnetoelectric transport and broad-band dielectric spectroscopy of the all-perovskite core-shell composite nanoceramics of 0-3 connectivity, in which ~50 nm cores of ferromagnetic La0.65Sr0.35MnO3 (LSMO) metal are embedded in ferroelectric BaTiO3 (BTO) shells of mean 13 nm thickness. The BTO spacers lead to significant barriers for itinerant carriers, at low temperatures being transmitted by tunneling, but additional conduction paths are temperature activated by hopping across them. The dielectric, terahertz and infrared spectroscopy data of LSMO@BTO are modelled by effective medium approaches, which enables to explain the broad dielectric and AC conductivity dispersion. Temperature dependant terahertz transmission spectroscopy clearly indicates the ferroelectric transition in the nano-BTO shells in the same temperature range as in the bulk BTO.
Trvalý link: http://hdl.handle.net/11104/0321968