DOI: 10.1126/science.258.5083.770. Femtosecond Resolution of Soft Mode Dynamics in Structural Phase Transitions

Femtosecond Resolution of Soft Mode Dynamics in Structural Phase Transitions

10.1126/science.258.5083.770

Crossref journal-article

American Association for the Advancement of Science (AAAS)

Science (221)

Abstract

The microscopic pathway along which ions or molecules in a crystal move during a structural phase transition can often be described in terms of a collective vibrational mode of the lattice. In many cases, this mode, called a "soft" phonon mode because of its characteristically low frequency near the phase transition temperature, is difficult to characterize through conventional frequency-domain spectroscopies such as light or neutron scattering. A femtosecond time-domain analog of light-scattering spectroscopy called impulsive stimulated Raman scattering (ISRS) has been used to examine the soft modes of two perovskite ferroelectric crystals. The low-frequency lattice dynamics of KNbO 3 and BaTiO 3 are clarified in a manner that permits critical evaluation of microscopic models for their ferroelectric transitions. The results illustrate the advantages of ISRS over conventional Raman spectroscopy of low-frequency, heavily damped soft modes.

Bibliography

Dougherty, T. P., Wiederrecht, G. P., Nelson, K. A., Garrett, M. H., Jensen, H. P., & Warde, C. (1992). Femtosecond Resolution of Soft Mode Dynamics in Structural Phase Transitions. Science, 258(5083), 770â774.

Authors 6

Thomas P. Dougherty (first)
Gary P. Wiederrecht (additional)
Keith A. Nelson (additional)
Mark H. Garrett (additional)
Hans P. Jensen (additional)
Cardinal Warde (additional)

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Dates

Type	When
Created	18 years, 10 months ago (Oct. 5, 2006, 7:03 p.m.)
Deposited	1 year, 7 months ago (Jan. 12, 2024, 5:16 p.m.)
Indexed	2 months, 3 weeks ago (May 27, 2025, 6:47 a.m.)
Issued	32 years, 9 months ago (Oct. 30, 1992)
Published	32 years, 9 months ago (Oct. 30, 1992)
Published Print	32 years, 9 months ago (Oct. 30, 1992)

Funders 0

None

BibTeX

@article{Dougherty_1992, title={Femtosecond Resolution of Soft Mode Dynamics in Structural Phase Transitions}, volume={258}, ISSN={1095-9203}, url={http://dx.doi.org/10.1126/science.258.5083.770}, DOI={10.1126/science.258.5083.770}, number={5083}, journal={Science}, publisher={American Association for the Advancement of Science (AAAS)}, author={Dougherty, Thomas P. and Wiederrecht, Gary P. and Nelson, Keith A. and Garrett, Mark H. and Jensen, Hans P. and Warde, Cardinal}, year={1992}, month=oct, pages={770–774} }

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