Surface Conduction on InsulatingBaTiO3Crystal Suggesting an Intrinsic Surface Electron Layer | Zendy

Yukio Watanabe | Zendy; Motochika Okano | Zendy; Akihiro Masuda | Zendy

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Surface Conduction on InsulatingBaTiO3Crystal Suggesting an Intrinsic Surface Electron Layer

Author(s) -

Yukio Watanabe,

Motochika Okano,

Akihiro Masuda

Publication year - 2001

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.86.332

Subject(s) - ferroelectricity , thermal conduction , materials science , condensed matter physics , conductance , surface (topology) , perpendicular , physics , optoelectronics , dielectric , geometry , composite material , mathematics

We report conduction measurements on the clean, free surface of transparent insulating BaTiO3 single crystals in high vacuum. We find that the insulating BaTiO3 crystals exhibit surface conductance that is dependent on the spontaneous polarization, whereas no conduction perpendicular to the surface is observed. The surface conduction shows semimetallic temperature dependence and persists down to at least 100 K. The observations suggest a two-dimensional electron on a clean, free ferroelectric surface that may be regarded as a ferroelectric metal. The results have important implications for understandings of the fundamental properties of ferroelectrics, the size effect, and ferroelectric devices.

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