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https://doi.org/10.3938/NPSM.68.1
Study on the Elastic Properties and the Phase Transition Behavior of Condensed Matter by Using Brillouin Light Scattering Spectroscopy
New Phys.: Sae Mulli 2018; 68: 1~19
Published online January 31, 2018;  https://doi.org/10.3938/NPSM.68.1
© 2018 New Physics: Sae Mulli.

Jae-Hyeon KO*

Department of Physics, Hallym University, Chuncheon 24252, Korea
Correspondence to: hwangko@hallym.ac.kr
Received October 10, 2017; Revised November 3, 2017; Accepted November 6, 2017.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Brillouin spectroscopy is one of the inelastic laser-light scattering spectroscopies and is used to probe long-wavelength low-energy excitation processes in the characteristic frequency range of a few tens of gigahertz. Based on this technique, the velocities of acoustic waves in amorphous materials, such as polymers and liquids, and the energies and the elastic constants of acoustic phonon modes in crystals can be determined accurately. The elastic property is one of the fundamental physical properties in condensed matter, and it is sensitive to phase transitions and to changes in structure or composition. In this paper, we review the principles and the measurement methods of Brillouin spectroscopy and their main applications. Especially, we discuss property data and related physics obtainable from Brillouin spectroscopy by investigating several application examples, such as perovskite-structured oxide materials showing ferroelectricity or a relaxor state and amorphous materials including polymers. 
PACS numbers: 78.35.+c, 62.60.+v
Keywords: Elastic property, Brillouin scattering, Condensed matter, Phase transition, Ferroelectricity


May 2018, 68 (5)
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