Ionic polarizability of conductive metal oxides and critical thickness for ferroelectricity in BaTiO3

被引：216

作者：

Gerra, G ^{[1
]}

Tagantsev, AK

Setter, N

Parlinski, K

机构：

[1] Swiss Fed Inst Technol, Ceram Lab, CH-1015 Lausanne, Switzerland

[2] Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 10期

关键词：

D O I：

10.1103/PhysRevLett.96.107603

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report a first-principles investigation of ultrathin BaTiO3 films with SrRuO3 electrodes. We find that the ionic relaxations in the metal-oxide electrode play a crucial role in stabilizing the ferroelectric phase. Comparison with frozen-phonon calculations shows that the degree of softness of the SrRuO3 lattice has an essential impact on the screening of ferroelectric polarization in BaTiO3. The critical thickness for ferroelectricity in BaTiO3 is found to be 1.2 nm. The results of our calculations provide a possible explanation for the beneficial impact of oxide electrodes on the switching and dielectric properties of ferroelectric capacitors.

引用

页数：4

共 28 条

[1] Ferroelectricity at the nanoscale: Local polarization in oxide thin films and heterostructures [J].

Ahn, CH ;

Rabe, KM ;

Triscone, JM .

SCIENCE, 2004, 303 (5657) :488-491

[2] The physics of ferroelectric memories [J].

Auciello, O ;

Scott, JF ;

Ramesh, R .

PHYSICS TODAY, 1998, 51 (07) :22-27

[3] BAND OFFSETS IN LATTICE-MATCHED HETEROJUNCTIONS - A MODEL AND 1ST-PRINCIPLES CALCULATIONS FOR GAAS/ALAS [J].

BALDERESCHI, A ;

BARONI, S ;

RESTA, R .

PHYSICAL REVIEW LETTERS, 1988, 61 (06) :734-737

[4]

BUCHANAN RC, 1997, CERAMIC MAT ELECT

[5] ORIGIN OF FERROELECTRICITY IN PEROVSKITE OXIDES [J].

COHEN, RE .

NATURE, 1992, 358 (6382) :136-138

[6] Unusual behavior of the ferroelectric polarization in PbTiO3/SrTiO3 superlattices -: art. no. 177601 [J].

Dawber, M ;

Lichtensteiger, C ;

Cantoni, M ;

Veithen, M ;

Ghosez, P ;

Johnston, K ;

Rabe, KM ;

Triscone, JM .

PHYSICAL REVIEW LETTERS, 2005, 95 (17)

[7] Ferroelectricity in ultrathin perovskite films [J].

Fong, DD ;

Stephenson, GB ;

Streiffer, SK ;

Eastman, JA ;

Auciello, O ;

Fuoss, PH ;

Thompson, C .

SCIENCE, 2004, 304 (5677) :1650-1653

[8] Surface-stimulated nucleation of reverse domains in ferroelectrics [J].

Gerra, G ;

Tagantsev, AK ;

Setter, N .

PHYSICAL REVIEW LETTERS, 2005, 94 (10) :1-4

[9] Critical thickness for ferroelectricity in perovskite ultrathin films [J].

Junquera, J ;

Ghosez, P .

NATURE, 2003, 422 (6931) :506-509

[10] THEORY OF POLARIZATION OF CRYSTALLINE SOLIDS [J].

KINGSMITH, RD ;

VANDERBILT, D .

PHYSICAL REVIEW B, 1993, 47 (03) :1651-1654

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