Strongly coupled phase transition in ferroelectric/correlated electron oxide heterostructures

Lu Jiang; Woo Seok Choi; Hyoungjeen Jeen; Takeshi Egami; Ho Nyung Lee

doi:10.1063/1.4738784

Strongly coupled phase transition in ferroelectric/correlated electron oxide heterostructures

Lu Jiang, Woo Seok Choi, Hyoungjeen Jeen, Takeshi Egami, Ho Nyung Lee

Materials Science and Technology Div

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

We fabricated ultrathin ferroelectric/correlated electron oxide heterostructures composed of the ferroelectric Pb(Zr _0.2Ti _0.8)O ₃ and the correlated electron oxide (CEO) La _0.8Sr _0.2MnO ₃ on SrTiO ₃ substrates by pulsed laser epitaxy. The hole accumulation in the ultrathin CEO layer was substantially modified by heterostructuring with the ferroelectric layer, resulting in an insulator-metal transition. In particular, our thickness dependent study showed that drastic changes in transport and magnetic properties were strongly coupled to the modulation of charge carriers by ferroelectric field effect, which was confined to the vicinity of the interface. Thus, our results provide crucial evidence that strong ferroelectric field effect control can be achieved in ultrathin (10 nm) heterostructures, yielding at least a 100 000-fold change in resistivity.

Original language	English
Article number	042902
Journal	Applied Physics Letters
Volume	101
Issue number	4
DOIs	https://doi.org/10.1063/1.4738784
State	Published - Jul 23 2012

Funding

We would like to thank Y. S. Kim for technical assistance for PFM measurements and E. Dagotto for helpful discussions. This work was supported by the U.S. Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division.

Funders	Funder number
U.S. Department of Energy
Basic Energy Sciences
Division of Materials Sciences and Engineering

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abstract = "We fabricated ultrathin ferroelectric/correlated electron oxide heterostructures composed of the ferroelectric Pb(Zr 0.2Ti 0.8)O 3 and the correlated electron oxide (CEO) La 0.8Sr 0.2MnO 3 on SrTiO 3 substrates by pulsed laser epitaxy. The hole accumulation in the ultrathin CEO layer was substantially modified by heterostructuring with the ferroelectric layer, resulting in an insulator-metal transition. In particular, our thickness dependent study showed that drastic changes in transport and magnetic properties were strongly coupled to the modulation of charge carriers by ferroelectric field effect, which was confined to the vicinity of the interface. Thus, our results provide crucial evidence that strong ferroelectric field effect control can be achieved in ultrathin (10 nm) heterostructures, yielding at least a 100 000-fold change in resistivity.",

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AU - Jiang, Lu

AU - Seok Choi, Woo

AU - Jeen, Hyoungjeen

AU - Egami, Takeshi

AU - Nyung Lee, Ho

PY - 2012/7/23

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AB - We fabricated ultrathin ferroelectric/correlated electron oxide heterostructures composed of the ferroelectric Pb(Zr 0.2Ti 0.8)O 3 and the correlated electron oxide (CEO) La 0.8Sr 0.2MnO 3 on SrTiO 3 substrates by pulsed laser epitaxy. The hole accumulation in the ultrathin CEO layer was substantially modified by heterostructuring with the ferroelectric layer, resulting in an insulator-metal transition. In particular, our thickness dependent study showed that drastic changes in transport and magnetic properties were strongly coupled to the modulation of charge carriers by ferroelectric field effect, which was confined to the vicinity of the interface. Thus, our results provide crucial evidence that strong ferroelectric field effect control can be achieved in ultrathin (10 nm) heterostructures, yielding at least a 100 000-fold change in resistivity.

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Strongly coupled phase transition in ferroelectric/correlated electron oxide heterostructures

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