Stabilization of monodomain polarization in ultrathin PbTiO3 films

被引：346

作者：

Fong, DD ^{[1
]}

Kolpak, AM

Eastman, JA

Streiffer, SK

Fuoss, PH

Stephenson, GB

Thompson, C

Kim, DM

Choi, KJ

Eom, CB

Grinberg, I

Rappe, AM

机构：

[1] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

[2] Univ Penn, Dept Chem, Makineni Theoret Labs, Philadelphia, PA 19104 USA

[3] No Illinois Univ, Dept Phys, De Kalb, IL 60115 USA

[4] Univ Wisconsin, Dept Mat Sci & Engn, Madison, WI 53706 USA

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 12期

关键词：

D O I：

10.1103/PhysRevLett.96.127601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using in situ high-resolution synchrotron x-ray scattering, the Curie temperature T-C has been determined for ultrathin c-axis epitaxial PbTiO3 films on conducting substrates (SrRuO3 on SrTiO3), with surfaces exposed to a controlled vapor environment. The suppression of T-C was relatively small, even for the thinnest film (1.2 nm). We observe that 180 degrees stripe domains do not form, indicating that the depolarizing field is compensated by free charge at both interfaces. This is confirmed by ab initio calculations that find polar ground states in the presence of ionic adsorbates.

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页数：4

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