TY  - JOUR
A1  - Maerten, Lena
A1  - Bojahr, Andre
A1  - Gohlke, Mathias
A1  - Rössle, Matthias
A1  - Bargheer, Matias
T1  - Coupling of GHz Phonons to Ferroelastic Domain Walls in SrTiO3
T2  - Physical review letters
N2  - We study the linear and nonlinear acoustic response of SrTiO3 across its ferroelastic transition at T-a = 105 K by time domain Brillouin scattering. Above T-a we observe that for a strain amplitude of similar to 0.18% the sound velocity for compressive strain exceeds the tensile strain velocity by 3%. Below T-a 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.
Y1  - 2015
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/39235
SN  - 0031-9007
SN  - 1079-7114
VL  - 114
IS  - 4
PB  - American Physical Society
CY  - College Park
ER  -