Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session D15: Superconductivity: Tunneling Properties
3:00 PM–5:48 PM,
Monday, March 4, 2024
Room: M100F
Sponsoring
Unit:
DCMP
Chair: Yoshiharu Krockenberger, NTT Basic Research Labs
Abstract: D15.00012 : Hyperspectral Nano-Imaging of Deformation Induced Self Organized Structures in SrTiO3
5:12 PM–5:24 PM
Presenter:
Liam Thompson
(University of Minnesota)
Authors:
Liam Thompson
(University of Minnesota)
Brayden Lukaskawcez
(University of Minnesota - TC)
Issam Khayr
(University of Minnesota, Twin Cities)
Sajna Hameed
(Max Planck Institute for Solid State Research)
Martin Greven
(University of Minnesota)
Alexander S McLeod
(University of Minnesota)
Phase-resolved hyperspectral imaging using a scanning near-field optical microscope measured nanoscale variations in the optical phonon response in plastically deformed SrTiO3. This technique generates a large amount of multi-dimensional data, which require new modes of analysis to understand. Principal component analysis extracted the principal variations and reduced the dimensionality of the data. The complex principal variations were then mapped onto linear variations in the real physical parameters of the system through a novel method of constrained linear regression. The result is a nanoscale map of variations in the damping, frequency and other parameters of the optical phonon due to the presence of dislocation structures at the surface. These parameters can be related to local disorder and strain.
Fluctuations in the optical phonon response exhibit a periodic texture of lines correlated with the nano-scale surface corrugations perpendicular to the strained axis. These nanoscale maps of the system parameters will be used to understand the enhancement of superconductivity observed at low temperatures.
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