Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session A27: Superconductivity: General I
8:00 AM–11:00 AM,
Monday, March 6, 2023
Room: Room 219
Sponsoring
Unit:
DCMP
Chair: Danfeng Li, City University of Hong Kong
Abstract: A27.00015 : Self Organized Nano-Structures in SrTiO3 Induced by Plastic Deformation*
10:48 AM–11:00 AM
Presenter:
Liam Thompson
(University of Minnesota)
Authors:
Liam Thompson
(University of Minnesota)
Issam Khayr
(University of Minnesota, Twin Cities)
Chiou Yang Tan
(University of Minnesota)
Sajna Hameed
(Max Planck Institute for Solid State Research)
Damjan Pelc
(Univ of Zagreb)
Hayden Binger
(University of Minnesota)
Devon Uram
(University of Minnesota)
Martin Greven
(University of Minnesota)
Alexander S McLeod
(University of Minnesota)
Plastic deformation of SrTiO3 single crystals is known to generate a superstructure of line dislocations as confirmed by X-ray and neutron diffraction1. Enhancement of superconductivity and anisotropic conductivity was hypothesized to occur along these dislocation structures. Local strain is known to shift the energy and dissipation of phonons, with strong implications for the mid-infrared optical response in polar crystals. A Scanning Near-field Optical Microscope equipped with a balanced asymmetric Michelson interferometer imaged nanoscale variations in the optical phonon response in plastically deformed SrTiO3. Phase-resolved nano-spectroscopy performed near walls of line dislocations was used to infer the optical phonon parameters and quantify dislocation-induced strain fields in the crystal.
The optical phonon response exhibits a periodic texture of lines correlated with nano-scale surface corrugation oriented perpendicular to the strained axis. Shifts in the surface potential measured using Kelvin probe force microscopy correlate with these dislocation structures, and provides evidence for local strain-induced ferroelectric order. This represents a novel approach to directly probe the real-space superstructure of plastically deformed superconducting ceramic oxides.
[1] Hameed et al. Nat. Mater. 21, 54-61 (2022)
*"This work was funded in part by the DOE through the University of Minnesota Center for QuantumMaterials under DE-SC0016371."
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