Strongly charged head-to-head domain walls that are purposely engineered along the  crystallographic orientation into ferroelectric BaTiO 3single 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 cm 2(V s) -1, while the two-dimensional charge density amounts to 7 × 10 3cm -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.
|Number of pages||6|
|Journal||ACS Applied Nano Materials|
|Publication status||Published - 22 Jul 2022|
DFG Classification of Subject Areas according to Review Boards
Subject groups, research areas, subject areas according to Destatis
ASJC Scopus subject areas
- Hall effect, barium titanate, domain wall conductivity, ferroelectrics, head-to-head domain walls, two-dimensional electron gas, van der Pauw method