Direct measurements of optical phonons in SrTiO3 nanosystems

Journal Article

Wolpert, D, K Korolev, S Sachs, J Knab, W Cox, J Cerne, A.G Markelz, T Zhao, Ramamoorthy Ramesh, B.H Moeckly

10.1016/S1386-9477(03)00305-9

We use terahertz time domain spectroscopy to examine finite size effects on the optical phonon modes in SrTiO3 thin films. In temperature-dependent measurements we find a near absence of mode softening in the TO1 phonon frequency. Furthermore we see an increase in the soft mode frequency with reduced thickness. Both of these results correlate well with the reduced dielectric response observed for nanoscale ferroelectric systems. © 2003 Elsevier B.V. All rights reserved.

Physica E: Low-Dimensional Systems and Nanostructures

19

2003

13869477

cited By 3

Ramesh Lab