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Free-electron gas at charged domain walls in insulating BaTiO3

Author

Listed:
  • Tomas Sluka

    (Ceramics Laboratory, EPFL Swiss Federal Institute of Technology, Station 12)

  • Alexander K. Tagantsev

    (Ceramics Laboratory, EPFL Swiss Federal Institute of Technology, Station 12)

  • Petr Bednyakov

    (Ceramics Laboratory, EPFL Swiss Federal Institute of Technology, Station 12)

  • Nava Setter

    (Ceramics Laboratory, EPFL Swiss Federal Institute of Technology, Station 12)

Abstract

Hetero interfaces between metal-oxides display pronounced phenomena such as semiconductor-metal transitions, magnetoresistance, the quantum hall effect and superconductivity. Similar effects at compositionally homogeneous interfaces including ferroic domain walls are expected. Unlike hetero interfaces, domain walls can be created, displaced, annihilated and recreated inside a functioning device. Theory predicts the existence of 'strongly' charged domain walls that break polarization continuity, but are stable and conduct steadily through a quasi-two-dimensional electron gas. Here we show this phenomenon experimentally in charged domain walls of the prototypical ferroelectric BaTiO3. Their steady metallic-type conductivity, 109 times that of the parent matrix, evidence the presence of stable degenerate electron gas, thus adding mobility to functional interfaces.

Suggested Citation

  • Tomas Sluka & Alexander K. Tagantsev & Petr Bednyakov & Nava Setter, 2013. "Free-electron gas at charged domain walls in insulating BaTiO3," Nature Communications, Nature, vol. 4(1), pages 1-6, October.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms2839
    DOI: 10.1038/ncomms2839
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    Cited by:

    1. Felix Risch & Yuri Tikhonov & Igor Lukyanchuk & Adrian M. Ionescu & Igor Stolichnov, 2022. "Giant switchable non thermally-activated conduction in 180° domain walls in tetragonal Pb(Zr,Ti)O3," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    2. Xiangbin Cai & Chao Chen & Lin Xie & Changan Wang & Zixin Gui & Yuan Gao & Ulrich Kentsch & Guofu Zhou & Xingsen Gao & Yu Chen & Shengqiang Zhou & Weibo Gao & Jun-Ming Liu & Ye Zhu & Deyang Chen, 2023. "In-plane charged antiphase boundary and 180° domain wall in a ferroelectric film," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    3. Shulin Zhong & Xuanlin Zhang & Jian Gou & Lan Chen & Su-Huai Wei & Shengyuan A. Yang & Yunhao Lu, 2024. "Lone-pair activated ferroelectricity and stable charged domain wall in Bi monolayer," Nature Communications, Nature, vol. 15(1), pages 1-8, December.

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