Direct measurements of optical phonons in SrTiO3 nanosystems

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

doi:10.1016/S1386-9477(03)00305-9

Direct measurements of optical phonons in SrTiO₃ nanosystems

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

Physics

University at Buffalo

SUNY Buffalo
University of Maryland, College Park
Superconductor Technologies Inc.

Research output: Contribution to journal › Conference article › peer-review

3 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	236-239
Number of pages	4
Journal	Physica E: Low-Dimensional Systems and Nanostructures
Volume	19
Issue number	1-2
DOIs	https://doi.org/10.1016/S1386-9477(03)00305-9
State	Published - Jul 2003
Event	Fourth International Symposium on Nanostructures and Mesoscopi - Tempe, AZ, United States Duration: Feb 17 2003 → Feb 21 2003

Keywords

Ferroelectrics
Finite size
Mode softening
Phonons
Strontium titanate
Terahertz

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10.1016/S1386-9477(03)00305-9

Cite this

@article{d8f3601716ca41219bfbc08a5627cf2e,

title = "Direct measurements of optical phonons in SrTiO3 nanosystems",

abstract = "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.",

keywords = "Ferroelectrics, Finite size, Mode softening, Phonons, Strontium titanate, Terahertz",

author = "D. Wolpert and K. Korolev and S. Sachs and J. Knab and W. Cox and J. Cerne and Markelz, \{A. G.\} and T. Zhao and R. Ramesh and Moeckly, \{B. H.\}",

year = "2003",

month = jul,

doi = "10.1016/S1386-9477(03)00305-9",

language = "English",

volume = "19",

pages = "236--239",

journal = "Physica E: Low-Dimensional Systems and Nanostructures",

issn = "1386-9477",

publisher = "Elsevier B.V.",

number = "1-2",

note = "Fourth International Symposium on Nanostructures and Mesoscopi ; Conference date: 17-02-2003 Through 21-02-2003",

}

TY - JOUR

T1 - Direct measurements of optical phonons in SrTiO3 nanosystems

AU - Wolpert, D.

AU - Korolev, K.

AU - Sachs, S.

AU - Knab, J.

AU - Cox, W.

AU - Cerne, J.

AU - Markelz, A. G.

AU - Zhao, T.

AU - Ramesh, R.

AU - Moeckly, B. H.

PY - 2003/7

Y1 - 2003/7

N2 - 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.

AB - 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.

KW - Ferroelectrics

KW - Finite size

KW - Mode softening

KW - Phonons

KW - Strontium titanate

KW - Terahertz

UR - https://www.scopus.com/pages/publications/0041508601

U2 - 10.1016/S1386-9477(03)00305-9

DO - 10.1016/S1386-9477(03)00305-9

M3 - Conference article

SN - 1386-9477

VL - 19

SP - 236

EP - 239

JO - Physica E: Low-Dimensional Systems and Nanostructures

JF - Physica E: Low-Dimensional Systems and Nanostructures

IS - 1-2

T2 - Fourth International Symposium on Nanostructures and Mesoscopi

Y2 - 17 February 2003 through 21 February 2003

ER -

Direct measurements of optical phonons in SrTiO₃ nanosystems

Abstract

Keywords

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