Intrinsic and extrinsic conduction contributions at nominally neutral domain walls in hexagonal manganites

Abstract

Conductive and electrostatic atomic force microscopy (cAFM and EFM) are used to investigate the electric conduction at nominally neutral domain walls in hexagonal manganites. The EFM measurements reveal a propensity of mobile charge carriers to accumulate at the nominally neutral domain walls in ErMnO3, which is corroborated by cAFM scans showing locally enhanced d.c. conductance. Our findings are explained based on established segregation enthalpy profiles for oxygen vacancies and interstitials, providing a microscopic model for previous, seemingly disconnected observations ranging from insulating to conducting domain wall behavior. In addition, we observe variations in conductance between different nominally neutral walls that we attribute to deviations from the ideal charge-neutral structure within the bulk, leading to a superposition of extrinsic and intrinsic contributions. Our study clarifies the complex transport properties at nominally neutral domain walls in hexagonal manganites and establishes new possibilities for tuning their electronic response based on oxidation conditions, opening the door for domain-wall based sensor technology.

arXiv comment5 pages, 3 figures

References in corpus (13)

• Anisotropic conductance at improper ferroelectric domain walls
• Conduction at domain walls in insulating Pb(Zr${}_{0.2}$Ti${}_{0.8}$)O${}_3$ thin films
• Static conductivity of charged domain wall in uniaxial ferroelectric-semiconductors
• The High Temperature Phase Transitions of Hexagonal YMnO3
• Direct observation of the proliferation of ferroelectric loop domains and vortex-antivortex pairs
• Structural Domain Walls in Polar Hexagonal Manganites
• Electrical half-wave rectification at ferroelectric domain walls
• Local conductivity and the role of vacancies around twin walls of (001)-BiFeO3 thin films
• Low-energy Structural Dynamics of Ferroelectric Domain Walls in Hexagonal Rare-earth Manganites
• Domain Wall Conductivity in Oxygen Deficient Multiferroic YMnO3 Single Crystals
• Charged domain walls in improper ferroelectric hexagonal manganites and gallates
• Oxygen vacancies in bulk and at neutral domain walls in hexagonal YMnO${}_3$
• Microwave Conductivity of Ferroelectric Domains and Domain Walls in Hexagonal Rare-earth Ferrite

Cited by in corpus (2)

• Charged ferroelectric domain walls for deterministic a.c. signal control
• Moiré Fringes in Conductive Atomic Force Microscopy