@article{8f63b70e61204d93921e52ccd7d6944b,
title = "Infrared nano-spectroscopy of ferroelastic domain walls in hybrid improper ferroelectric Ca3Ti2O7 ",
abstract = "Ferroic materials are well known to exhibit heterogeneity in the form of domain walls. Understanding the properties of these boundaries is crucial for controlling functionality with external stimuli and for realizing their potential for ultra-low power memory and logic devices as well as novel computing architectures. In this work, we employ synchrotron-based near-field infrared nano-spectroscopy to reveal the vibrational properties of ferroelastic (90∘ ferroelectric) domain walls in the hybrid improper ferroelectric Ca3Ti2O7. By locally mapping the Ti-O stretching and Ti-O-Ti bending modes, we reveal how structural order parameters rotate across a wall. Thus, we link observed near-field amplitude changes to underlying structural modulations and test ferroelectric switching models against real space measurements of local structure. This initiative opens the door to broadband infrared nano-imaging of heterogeneity in ferroics.",
author = "Smith, {K. A.} and Nowadnick, {E. A.} and S. Fan and O. Khatib and Lim, {S. J.} and B. Gao and Harms, {N. C.} and Neal, {S. N.} and Kirkland, {J. K.} and Martin, {M. C.} and Won, {C. J.} and Raschke, {M. B.} and Cheong, {S. W.} and Fennie, {C. J.} and Carr, {G. L.} and Bechtel, {H. A.} and Musfeldt, {J. L.}",
note = "Funding Information: Research at the University of Tennessee is supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Materials Science Division under award DE-FG02-01ER45885. Portions of the measurements utilized beamlines 5.4 and 2.4 at the Advanced Light Source, which is a DOE Office of Science User Facility operated under contract no. DE-AC02-05CH11231, including the remote user program from NSLS-II under contract DE-SC0012704. Work at Cornell is supported by the Army Research Office under grant W911NF-10-1-0345. Work at Rutgers is funded by the Gordon and Betty Moore Foundation{\textquoteright}s EPiQS Initiative through Grant GBMF4413 to the Rutgers Center for Emergent Materials. E.A.N. acknowledges additional support from the New Jersey Institute of Technology. M.B.R. and O.K. acknowledge support from the U.S. Department of Energy, Office of Basic Sciences, Division of Material Sciences and Engineering, under award no. DE-SC0008807. O.K. acknowledges support from the ALS Postdoctoral Fellowship program. Work at Postech is supported by the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (No. 2016K1A4A4A01922028). Publisher Copyright: {\textcopyright} 2019, The Author(s).",
year = "2019",
month = dec,
day = "1",
doi = "10.1038/s41467-019-13066-9",
language = "English (US)",
volume = "10",
journal = "Nature communications",
issn = "2041-1723",
publisher = "Nature Publishing Group",
number = "1",
}