Nanoscale conductive sheets in ferroelectric BaTiO.sub.3./sub.: Large Hall electron mobilities at head-to-head domain walls

0559631 - FZÚ 2023 RIV US eng J - Journal Article
Beccard, H. - Kirbus, B. - Beyreuther, E. - Ruesing, M. - Bednyakov, Petr - Hlinka, Jiří - Eng, L.M.
Nanoscale conductive sheets in ferroelectric BaTiO₃: Large Hall electron mobilities at head-to-head domain walls.
ACS Applied Nano Materials. Roč. 5, č. 7 (2022), s. 8717-8722. ISSN 2574-0970
R&D Projects: GA MŠMT(CZ) EF16_019/0000760; GA ČR(CZ) GJ20-05167Y
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : ferroelectrics * head-to-head domain walls * domain wall conductivity * Hall effect * van der Pauw method * barium titanate * two-dimensional electron gas
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 5.9, year: 2022
Method of publishing: Limited access
https://doi.org/10.1021/acsanm.2c01919

Strongly charged head-to-head domain walls that are purposely engineered along the [110] crystallographic orientation into ferroelectric BaTiO3 single crystals have been proposed as intrinsically nanoscaled two-dimensional electron gases (2DEGs) because of their significant conductivity. Here, we quantify these 2DEG properties through dedicated Hall transport measurements in van der Pauw 4-point geometry, finding the electron mobility to reach around 400 cm2 (V s)−1, while the two-dimensional charge density amounts to 7 × 103 cm–2. We underline the necessity to take into account the thermal and geometrical misalignment offset voltages by evaluating the Hall resistance under magnetic field sweeps, otherwise, errors of several hundred percent in the derived transport parameters can occur.
Permanent Link: https://hdl.handle.net/11104/0333149