Anomalous phase transition in strained SrTiO3 thin films

被引:28
作者
He, FZ [1 ]
Wells, BO
Shapiro, SM
von Zimmermann, M
Clark, A
Xi, XX
机构
[1] Univ Connecticut, Dept Phys, Storrs, CT 06269 USA
[2] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA
[3] Penn State Univ, Dept Phys, University Pk, PA 16802 USA
基金
美国国家科学基金会;
关键词
D O I
10.1063/1.1589186
中图分类号
O59 [应用物理学];
学科分类号
摘要
We have studied the cubic-to-tetragonal phase transition in epitaxial SrTiO3 films under various biaxial strain conditions using synchrotron x-ray diffraction. Measuring the superlattice peak associated with TiO6 octahedra rotation in the low-temperature tetragonal phase indicates the presence of a phase transition whose critical temperature is a strong function of strain, with T-C as much as 50 K above the corresponding bulk temperature. Surprisingly, the lattice constants evolve smoothly through the transition, with no indication of a phase change. This signals an important change in the nature of the phase transition due to the epitaxial strain and substrate clamping effect. The internal degrees of freedom (TiO6 rotations) evolve independently from the overall lattice shape. (C) 2003 American Institute of Physics.
引用
收藏
页码:123 / 125
页数:3
相关论文
共 19 条
[1]   Electric-field-induced soft-mode hardening in SrTiO3 films [J].
Akimov, IA ;
Sirenko, AA ;
Clark, AM ;
Hao, JH ;
Xi, XX .
PHYSICAL REVIEW LETTERS, 2000, 84 (20) :4625-4628
[2]   CHANGE OF LATTICE PARAMETERS OF SRTIO3 NEAR PHASE TRANSITION AT 108 DEGREES K [J].
ALEFELD, B .
ZEITSCHRIFT FUR PHYSIK, 1969, 222 (02) :155-&
[3]   Thermodynamics of polydomain heterostructures. III. Domain stability map [J].
Alpay, SP ;
Roytburd, AL .
JOURNAL OF APPLIED PHYSICS, 1998, 83 (09) :4714-4723
[4]   Phase diagrams and dielectric response of epitaxial barium strontium titanate films: A theoretical analysis [J].
Ban, ZG ;
Alpay, SP .
JOURNAL OF APPLIED PHYSICS, 2002, 91 (11) :9288-9296
[5]   Dielectric properties in heteroepitaxial Ba0.6Sr0.4TiO3 thin films:: Effect of internal stresses and dislocation-type defects [J].
Canedy, CL ;
Li, H ;
Alpay, SP ;
Salamanca-Riba, L ;
Roytburd, AL ;
Ramesh, R .
APPLIED PHYSICS LETTERS, 2000, 77 (11) :1695-1697
[6]   Critical behaviour of the SrTiO3(001) surface at the structural phase transition [J].
Doi, SC ;
Takahashi, I .
PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, 2000, 80 (08) :1889-1899
[7]  
HE F, UNPUB
[8]   NEUTRON-SCATTERING AND X-RAY-SCATTERING STUDY OF THE 2 LENGTH SCALES IN THE CRITICAL FLUCTUATIONS OF SRTIO3 [J].
HIROTA, K ;
HILL, JP ;
SHAPIRO, SM ;
SHIRANE, G ;
FUJII, Y .
PHYSICAL REVIEW B, 1995, 52 (18) :13195-13205
[9]   Near single crystal-level dielectric loss and nonlinearity in pulsed laser deposited SrTiO3 thin films [J].
Li, HC ;
Si, WD ;
West, AD ;
Xi, XX .
APPLIED PHYSICS LETTERS, 1998, 73 (02) :190-192
[10]   Thickness dependence of dielectric loss in SrTiO3 thin films [J].
Li, HC ;
Si, WD ;
West, AD ;
Xi, XX .
APPLIED PHYSICS LETTERS, 1998, 73 (04) :464-466