Temperature-dependent dielectric and electro-optic properties of a ZnO- BaTiO3 -ZnO heterostructure grown by pulsed-laser deposition

B. N. Mbenkum, N. Ashkenov, M. Schubert, M. Lorenz, H. Hochmuth, D. Michel, M. Grundmann, G. Wagner

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53 Scopus citations

Abstract

Temperature-dependent dielectric and electro-optic properties of a ZnO- BaTiO3 -ZnO heterostructure grown by pulsed-laser deposition on (0001) sapphire are reported. The wurtzite-structure ZnO layers serve as transparent conducting electrodes. Previously observed coupling effects within the wurtzite-perovskite heterostructure by spectroscopic electro-optic ellipsometry birefringence measurements manifest themselves as a "pinning" of the ferroelectric polarization in the BaTiO3 layer by the cladding ZnO layers. Temperature-controlled electro-optic Raman measurements assign the electro-optic birefringence results to a temperature-driven phase transition resulting from the leakage current within the sample. High-temperature small-signal capacitance measurements exploiting the conductive electrode properties of the cladding layers reveal occurrence of the Curie temperature of the BaTiO3 layer at 384 K.

Original languageEnglish (US)
Article number091904
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Volume86
Issue number9
DOIs
StatePublished - Feb 28 2005

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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