Conductivity Contrast and Tunneling Charge Transport in the Vortexlike Ferroelectric Domain Patterns of Multiferroic Hexagonal YMnO3
| Autor: | Dennis Meier, Alois Loidl, Stephan Krohns, Manfred Fiebig, E. Ruff, Peter Lunkenheimer, Martin Lilienblum |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Condensed matter physics General Physics and Astronomy 02 engineering and technology Conductivity 021001 nanoscience & nanotechnology 01 natural sciences Ferroelectricity Vortex Dielectric spectroscopy Condensed Matter::Materials Science 0103 physical sciences Domain (ring theory) Multiferroics Charge carrier 010306 general physics 0210 nano-technology Quantum tunnelling |
| Zdroj: | Physical Review Letters. 118 |
| ISSN: | 1079-7114 0031-9007 |
| Popis: | We deduce the intrinsic conductivity properties of the ferroelectric domain walls around the topologically protected domain vortex cores in multiferroic YMnO_{3}. This is achieved by performing a careful equivalent-circuit analysis of dielectric spectra measured in single-crystalline samples with different vortex densities. The conductivity contrast between the bulk domains and the less conducting domain boundaries is revealed to reach up to a factor of 500 at room temperature, depending on the sample preparation. Tunneling of localized defect charge carriers is the dominant charge-transport process in the domain walls that are depleted of mobile charge carriers. This work demonstrates that, via equivalent-circuit analysis, dielectric spectroscopy can provide valuable information on the intrinsic charge-transport properties of ferroelectric domain walls, which is of high relevance for the design of new domain-wall-based microelectronic devices. |
| Databáze: | OpenAIRE |
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