Nanoscale Conductive Sheets in Ferroelectric BaTiO3: Large Hall Electron Mobilities at Head-to-Head Domain Walls

Research output: Contribution to journalResearch articleContributedpeer-review

Abstract

Strongly charged head-to-head domain walls that are purposely engineered along the [110] 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.

Details

Original languageEnglish
Pages (from-to)8717-8722
Number of pages6
JournalACS Applied Nano Materials
Volume5
Issue number7
Publication statusPublished - 22 Jul 2022
Peer-reviewedYes

External IDs

Scopus 85135223468
unpaywall 10.1021/acsanm.2c01919
Mendeley af48d547-1b28-3f56-8362-01832ea45378
WOS 000828231700001

Keywords

DFG Classification of Subject Areas according to Review Boards

Subject groups, research areas, subject areas according to Destatis

ASJC Scopus subject areas

Keywords

  • Hall effect, barium titanate, domain wall conductivity, ferroelectrics, head-to-head domain walls, two-dimensional electron gas, van der Pauw method