<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>10</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">D. Wolpert</style></author><author><style face="normal" font="default" size="100%">W. Cox</style></author><author><style face="normal" font="default" size="100%">J. Cerne</style></author><author><style face="normal" font="default" size="100%">A. Markelz</style></author><author><style face="normal" font="default" size="100%">T. Zhao</style></author><author><style face="normal" font="default" size="100%">R. Ramesh</style></author></authors><secondary-authors><author><style face="normal" font="default" size="100%">Romanowicz M.</style></author></secondary-authors></contributors><titles><title><style face="normal" font="default" size="100%">Finite size effects in ferroelectric nanosystems: Absence of mode softening</style></title><secondary-title><style face="normal" font="default" size="100%">2003 Nanotechnology Conference and Trade Show - Nanotech</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Ferroelectric materials</style></keyword><keyword><style  face="normal" font="default" size="100%">Fourier Transform Infrared Spectroscopy</style></keyword><keyword><style  face="normal" font="default" size="100%">Frequency ranges</style></keyword><keyword><style  face="normal" font="default" size="100%">Lead compounds</style></keyword><keyword><style  face="normal" font="default" size="100%">Mode softening</style></keyword><keyword><style  face="normal" font="default" size="100%">nanostructured materials</style></keyword><keyword><style  face="normal" font="default" size="100%">Natural frequencies</style></keyword><keyword><style  face="normal" font="default" size="100%">Optical modes</style></keyword><keyword><style  face="normal" font="default" size="100%">Permittivity</style></keyword><keyword><style  face="normal" font="default" size="100%">phase transitions</style></keyword><keyword><style  face="normal" font="default" size="100%">phonons</style></keyword><keyword><style  face="normal" font="default" size="100%">Routers</style></keyword><keyword><style  face="normal" font="default" size="100%">Thermal effects</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2003</style></year><pub-dates><date><style  face="normal" font="default" size="100%">02/2003</style></date></pub-dates></dates><pub-location><style face="normal" font="default" size="100%">San Francisco, CA</style></pub-location><volume><style face="normal" font="default" size="100%">2</style></volume><pages><style face="normal" font="default" size="100%">76-81</style></pages><isbn><style face="normal" font="default" size="100%">0972842209</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;We present measurements of the mode softening behavior for PbZr 0.5Ti0.5O3 (PZT(50)) thin films using terahertz time domain spectroscopy (TTDS). The films were grown using pulsed laser deposition (PLD) techniques on silicon substrates to study how reduced size affects the mode softening behavior. At room temperature two modes are observed at 1.1 THz (37 cm-1) and at 2.3 THz (77 cm-1). As the temperature is increased toward Tc we do not see strong mode softening, but rather a spectral weight transfer from the high frequency mode to the low frequency mode. This absence of mode softening is more dramatic than that reported by other investigators[1]. We will discuss the possible sources for this discrepancy. These results suggest a change in lattice dynamics for nanoscale ferroelectric films that may be highly dependent on the sample preparation technique.&lt;/p&gt;</style></abstract><notes><style face="normal" font="default" size="100%">cited By 0</style></notes></record></records></xml>