title: Ferroelectricity and Self-Polarization in Ultrathin Relaxor Ferroelectric Films.
abstract: We report ferroelectricity and self-polarization in the (001) oriented ultrathin relaxor ferroelectric PMN-PT films grown on Nb-SrTiO3, SrRuO3 and La0.7Sr0.3MnO3, respectively. Resistance-voltage measurements and AC impedance analysis suggest that at high temperatures Schottky depletion width in a 4 nm thick PMN-PT film deposited on Nb-SrTiO3 is smaller than the film thickness. We propose that Schottky interfacial dipoles make the dipoles of the nanometer-sized polar nanoregions (PNRs) in PMN-PT films grown on Nb-SrTiO3 point downward at high temperatures and lead to the self-polarization at room temperature with the assistance of in-plane compressive strain. This work sheds light on the understanding of epitaxial strain effects on relaxor ferroelectric films and self-polarization mechanism.
authors.affiliation: Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China.|Collaborative Innovation Center of Quantum Matter, Beijing 100084, China.
authors.forename: Peixian
authors.initials: P
authors.lastname: Miao
authors.affiliation: Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China.|Collaborative Innovation Center of Quantum Matter, Beijing 100084, China.
authors.forename: Yonggang
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: Department of Chemistry, Tsinghua University, Beijing 100084, China.
authors.forename: Nengneng
authors.initials: N
authors.lastname: Luo
authors.affiliation: Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China.|Collaborative Innovation Center of Quantum Matter, Beijing 100084, China.
authors.forename: Diyang
authors.initials: D
authors.lastname: Zhao
authors.affiliation: Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China.|Collaborative Innovation Center of Quantum Matter, Beijing 100084, China.
authors.forename: Aitian
authors.initials: A
authors.lastname: Chen
authors.affiliation: Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China.|Collaborative Innovation Center of Quantum Matter, Beijing 100084, China.
authors.forename: Zhong
authors.initials: Z
authors.lastname: Sun
authors.affiliation: Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China.|Collaborative Innovation Center of Quantum Matter, Beijing 100084, China.
authors.forename: Meiqi
authors.initials: M
authors.lastname: Guo
authors.affiliation: Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China.|Collaborative Innovation Center of Quantum Matter, Beijing 100084, China.
authors.forename: Meihong
authors.initials: M
authors.lastname: Zhu
authors.affiliation: Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China.|Collaborative Innovation Center of Quantum Matter, Beijing 100084, China.
authors.forename: Huiyun
authors.initials: H
authors.lastname: Zhang
authors.affiliation: Department of Chemistry, Tsinghua University, Beijing 100084, China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Li
references.citation: Proc Natl Acad Sci U S A. 2012 Jun 19;109(25):9710-5
references.pmid: 22647612
references.citation: Science. 2004 Nov 5;306(5698):1005-9
references.pmid: 15528439
references.citation: ACS Nano. 2011 Jul 26;5(7):6032-8
references.pmid: 21682334
references.citation: Phys Rev Lett. 1992 Feb 10;68(6):847-850
references.pmid: 10046008
references.citation: Science. 2011 Nov 18;334(6058):958-61
references.pmid: 22096193
references.citation: Phys Rev Lett. 2009 Oct 23;103(17):177601
references.pmid: 19905783
references.citation: Science. 2006 Sep 15;313(5793):1614-6
references.pmid: 16973874
references.citation: Phys Rev Lett. 2006 Mar 31;96(12):127601
references.pmid: 16605959
references.citation: Science. 2012 Apr 6;336(6077):59-61
references.pmid: 22491848
references.citation: Nano Lett. 2009 Oct;9(10):3539-43
references.pmid: 19697939
references.citation: Phys Rev Lett. 2010 Jul 2;105(1):017601
references.pmid: 20867477
references.citation: Nature. 2006 Jun 22;441(7096):956-9
references.pmid: 16791189
references.citation: Science. 2004 Jun 11;304(5677):1650-3
references.pmid: 15192223
references.citation: Adv Mater. 2013 Oct 18;25(39):5643-9
references.pmid: 23897638
references.citation: Phys Rev Lett. 2009 Nov 13;103(20):207601
references.pmid: 20366012
references.citation: Phys Rev Lett. 2013 Dec 13;111(24):247602
references.pmid: 24483699
references.citation: Nat Commun. 2014 Nov 17;5:5414
references.pmid: 25399545
references.citation: Nat Commun. 2014 Aug 18;5:4693
references.pmid: 25131416
references.citation: Phys Rev Lett. 2012 Jul 20;109(3):037601
references.pmid: 22861896
references.citation: Phys Rev Lett. 2006 Sep 29;97(13):137601
references.pmid: 17026074
references.citation: Sci Rep. 2013;3:2482
references.pmid: 23963467