Coupling of GHz phonons to ferroelastic domain walls in SrTiO3.
Phys Rev Lett
; 114(4): 047401, 2015 Jan 30.
Article
em En
| MEDLINE
| ID: mdl-25679906
ABSTRACT
We study the linear and nonlinear acoustic response of SrTiO3 across its ferroelastic transition at Ta=105 K by time domain Brillouin scattering. Above Ta we observe that for a strain amplitude of â¼0.18% the sound velocity for compressive strain exceeds the tensile strain velocity by 3%. Below Ta we find a giant slowing down of the sound velocity by 12% and attribute this to the coupling of GHz phonons to ferroelastic twin domain walls. We propose a new mechanism for this coupling on the ultrafast time scale, providing an important new test ground for theories used to simulate atomic motion in domain forming crystals.
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MEDLINE
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En
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Phys Rev Lett
Ano de publicação:
2015
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Article
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Alemanha