Home

About

Advanced Search

Browse by Discipline

Scientific Societies

E-print Alerts

Add E-prints

E-print Network
FAQHELPSITE MAPCONTACT US


  Advanced Search  

 
Structural phase transition in epitaxial perovskite films Feizhou He* and B. O. Wells
 

Summary: Structural phase transition in epitaxial perovskite films
Feizhou He* and B. O. Wells
Department of Physics, University of Connecticut, Storrs, Connecticut 06269, USA
Z.-G. Ban and S. P. Alpay
Department of Materials Science and Engineering and Institute of Materials Science, University of Connecticut,
Storrs, Connecticut 06269, USA
S. Grenier, S. M. Shapiro, and Weidong Si
Department of Physics, Brookhaven National Laboratory, Upton, New York 11973, USA
A. Clark and X. X. Xi
Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
(Received 6 July 2004; published 6 December 2004)
Three different film systems have been systematically investigated to understand the effects of strain and
substrate constraint on the phase transitions of perovskite films. In SrTiO3 films, the phase transition tempera-
ture Tc was determined by monitoring the superlattice peaks associated with rotations of TiO6 octahedra. It is
found that Tc depends on both SrTiO3 film thickness and SrRuO3 buffer layer thickness. However, lattice
parameter measurements showed no sign of the phase transitions, indicating that the tetragonality of the SrTiO3
unit cells was no longer a good order parameter. This signals a change in the nature of this phase transition, the
internal degree of freedom is decoupled from the external degree of freedom. The phase transitions occur even
without lattice relaxation through domain formation. In NdNiO3 thin films, it is found that the in-plane lattice
parameters were clamped by the substrate, while the out-of-plane lattice constant varied to accommodate the

  

Source: Alpay, S. Pamir - Department of Materials Science and Engineering, University of Connecticut

 

Collections: Materials Science