Infrared nano-spectroscopy of ferroelastic domain walls in hybrid improper ferroelectric Ca3Ti2O7

Smith, Kevin B.; Nowadnick, Elizabeth; Fan, Shiyu; Khatib, Omar; Lim, So Young; Gao, Bin; Harms, Nathan C.; Neal, Sabine N.; Kirkland, Justin K.; Martin, Michael; Won, Choongjae; Raschke, Markus B.; Cheong, Sang‐Wook; Fennie, Craig J.; Carr, G. L.; Bechtel, Hans A.; Musfeldt, J. L.

doi:10.1038/s41467-019-13066-9

Cited by 19 publications

(18 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The sensitivity of SINS is high enough to discriminate, e.g., small changes in the local free carrier concentration associated with defects, doping, impurities, and layer thickness. [111,112] In an example combining optical, X-ray, and electron probes, SINS was used to investigate the electronic heterogeneities in topological insulator (TI) and thermoelectric materials Bi2Se3 and Sb2Te3 in a multimodal atomic-to-mesoscale resolution imaging study. [113] From the broadband SINS spectra and subsequent modeling of the tip-sample scattering response, the Drude free carrier concentration was extracted from several locations of the heterogeneous optical response in TI nanocrystals.…”

Section: Quantum Materialsmentioning

confidence: 99%

Synchrotron infrared nano-spectroscopy and -imaging

Bechtel

Johnson

Khatib

et al. 2020

Surface Science Reports

View full text Add to dashboard Cite

Infrared (IR) spectroscopy has evolved into a powerful analytical technique to probe molecular and lattice vibrations, low-energy electronic excitations and correlations, and related collective surface plasmon, phonon, or other polaritonic resonances. In combination with scanning probe microscopy, near-field infrared nano-spectroscopy and -imaging techniques have recently emerged as a frontier in imaging science, enabling the study of complex heterogeneous materials with simultaneous nanoscale spatial resolution and chemical and quantum state spectroscopic specificity. Here, we describe synchrotron infrared nano-spectroscopy (SINS), which takes advantage of the low-noise, broadband, high spectral irradiance, and coherence of synchrotron infrared radiation for near-field infrared measurements across the mid-to far-infrared with nanometer spatial resolution. This powerful combination provides a qualitatively new form of broadband spatio-spectral analysis of nanoscale, mesoscale, and surface phenomena that were previously difficult to study with IR techniques, or even any form of microspectroscopy in general. We review the development of SINS, describe its technical implementations, and highlight selected examples representative of the rapidly growing range of 2 applications in physics, chemistry, biology, materials science, geology, and atmospheric and space sciences.

show abstract

Section: Quantum Materialsmentioning

confidence: 99%

Synchrotron infrared nano-spectroscopy and -imaging

Bechtel

Johnson

Khatib

et al. 2020

Surface Science Reports

View full text Add to dashboard Cite

show abstract

“…In the case of double-layered RP structures (i.e., A

), HIF is induced due to the coupling of the nonpolar octahedral rotation (condensation of in-phase rotation and out-of-phase tilting modes) with a ferroelectric polar mode (cation displacements) [ 3 , 16 , 17 ]. Thus, the interdependence of polarization to other physical properties is expected in these compounds, for example, electric-control of magnetization function [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Group Theory Analysis to Study Phase Transitions of Quasi-2D Sr3Hf2O7

et al. 2021

View full text Add to dashboard Cite

We present an ab-initio study performed in the framework of density functional theory, group-subgroup symmetry analysis and lattice dynamics, to probe the octahedral distortions, which occur during the structural phase transitions of the quasi-2D layered perovskite Sr3Hf2O7 compound. Such a system is characterized by a high-temperature I4/mmm centrosymmetric structure and a ground-state Cmc21 ferroelectric phase. We have probed potential candidate polymorphs that may form the I4/mmm → Cmc21 transition pathways, namely Fmm2, Ccce, Cmca and Cmcm. We found that the band gap widths increase as the symmetry decreases, with the ground-state structure presenting the largest gap width (∼5.95 eV). By probing the Partial Density of States, we observe a direct relation regarding the tilts and rotations of the oxygen perovskite cages as the transition occurs; these show large variations mostly of the O p-states which contribute mostly to the valence band maximum. Moreover, by analyzing the hyperfine parameters, namely the Electric Field Gradients and asymmetric parameters, we observe variations as the transition occurs, from which it is possible to identify the most plausible intermediate phases. We have also computed the macroscopic polarization and confirm that the Cmc21 phase is ferroelectric with a value of spontaneous polarization of 0.0478 C/m2. The ferroelectricity of the ground-state Cmc21 system arises due to a second order parameter related to the coupling of the rotation and tilts of the O perovskite cages together with the Sr displacements.

show abstract

“…Recent studies in mouse retinae [ 133 , 134 ] and zebrafish non-cerebral vessels [ 135 , 136 ] show that Endoglin plays a crucial role in mouse retinal angiogenesis [ 133 ] and is also implicated in hereditary haemorrhagic telangiectasia (HHT) which may cause cerebral cerebrovascular arteriovenous malformations with upregulation of VEGF signalling [ 133 , 134 ]. Alk1 regulates EC migration in lumenized cerebral vessels [ 137 ], and Alk3 is required for cerebral venous identity [ 138 ].…”

Section: Signalling Pathways Driving Cerebrovascular Developmentmentioning

confidence: 99%

Cerebrovascular development: mechanisms and experimental approaches

Chico

Kugler

2021

Cell. Mol. Life Sci.

View full text Add to dashboard Cite

The cerebral vasculature plays a central role in human health and disease and possesses several unique anatomic, functional and molecular characteristics. Despite their importance, the mechanisms that determine cerebrovascular development are less well studied than other vascular territories. This is in part due to limitations of existing models and techniques for visualisation and manipulation of the cerebral vasculature. In this review we summarise the experimental approaches used to study the cerebral vessels and the mechanisms that contribute to their development.

show abstract

Infrared nano-spectroscopy of ferroelastic domain walls in hybrid improper ferroelectric Ca3Ti2O7

Cited by 19 publications

References 60 publications

Synchrotron infrared nano-spectroscopy and -imaging

Synchrotron infrared nano-spectroscopy and -imaging

Group Theory Analysis to Study Phase Transitions of Quasi-2D Sr3Hf2O7

Cerebrovascular development: mechanisms and experimental approaches

Contact Info

Product

Resources

About