Reflected polarized light microscopy of the ferroelastic domain structures of YBa2Cu3O7−x

Rabe, Heiko; Rivera, Jean-Pierre; Schmid, Hans; Chaminade, J.P.; Nganga, L.

doi:10.1016/0921-5107(90)90062-g

Cited by 10 publications

(3 citation statements)

References 5 publications

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“…Below 165 K, the system forms dense lamellar microstructures with alternating dark and bright domains marked by the black and white arrows in Figure d. These correspond to orthorhombic twins whose crystallographic directions are orthogonal to each other. − Since the spatial dimensions of twin domains are smaller than the probing beam size (∼1 mm 2 ) in ARPES, the observed photoemission spectra represent the dispersions from the twinned orthorhombic surface of which two orthogonal directions (i.e., x and y directions) get intermixed . Therefore, we keep the twin notations (i.e., X̅/Y̅) for the rest of the discussion.…”

Section: Resultsmentioning

confidence: 99%

Visualizing the Low-Energy Electronic Structure of Prototypical Hybrid Halide Perovskite through Clear Band Measurements

Park,

Huh,

Choi

et al. 2024

ACS Nano

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Organic−inorganic hybrid perovskites (OIHPs) are a promising class of materials that rival conventional semiconductors in various optoelectronic applications. However, unraveling the precise nature of their low-energy electronic structures continues to pose a significant challenge, primarily due to the absence of clear band measurements. Here, we investigate the low-energy electronic structure of CH 3 NH 3 PbI 3 (MAPI 3 ) using angle-resolved photoelectron spectroscopy combined with ab initio density functional theory. We successfully visualize the electronic structure of MAPI 3 near the bulk valence band maximum by using a laboratory photon source (He I α , 21.2 eV) at low temperature and explore its fundamental properties. The observed valence band exhibits a highly isotropic and parabolic band characterized by small effective masses of 0.20−0.21 m e , without notable spectral signatures associated with a large polaron or the Rashba effect, subjects that are intensely debated in the literature. Concurrently, our spin-resolved measurements directly disprove the giant Rashba scenario previously suggested in a similar perovskite compound by establishing an upper limit for the Rashba parameter (α R ) of 0.28 eV Å. Our results unveil the unusually complex nature of the low-energy electronic structure of OIHPs, thereby advancing our fundamental understanding of this important class of materials.

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Section: Resultsmentioning

confidence: 99%

Visualizing the Low-Energy Electronic Structure of Prototypical Hybrid Halide Perovskite through Clear Band Measurements

Park,

Huh,

Choi

et al. 2024

ACS Nano

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“…Optical microscopy is a simple non-contact method ideal to observe in situ the response of ferroelastic domain walls to temperature [44][45][46][47][48], electric field [48][49][50][51][52][53][54][55][56][57][58][59][60][61] or stress [62,63]. In transmission, the use of crossed-polarizers, combined with a spatial resolution of the order of a half wavelength of light, produces high-contrast images of the domain structure.…”

Section: Polarized Light Microscopymentioning

confidence: 99%

“…A few studies of ferroelastic domain walls have been performed in reflected light instead of transmitted light. In the case of YBa 2 Cu 3 O 7−x with a high density of domain walls (domain size below 5 nm), complex contrasts observed as a function of the positions of the polarizers have been attributed to a possible slight difference in refractive index between domain walls and domains [47].…”

Section: Polarized Light Microscopymentioning

confidence: 99%

Optical studies of ferroelectric and ferroelastic domain walls

Nataf

Guennou

2020

J. Phys.: Condens. Matter

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Recent studies carried out with atomic force microscopy or high-resolution transmission electron microscopy reveal that ferroic domain walls can exhibit different physical properties than the bulk of the domains, such as enhanced conductivity in insulators, or polar properties in non-polar materials. In this review we show that optical techniques, in spite of the diffraction limit, also provide key insights into the structure and physical properties of ferroelectric and ferroelastic domain walls. We give an overview of the uses, specificities and limits of these techniques, and emphasize the properties of the domain walls that they can probe. We then highlight some open questions of the physics of domain walls that could benefit from their use.

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Polarized Light Microscopy (PLM) of Ferroelectric and Ferroelastic Domains in Transmitted and Reflected Light

Schmid

1993

Ferroelectric Ceramics

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The importance of polarized light microscopy (PLM) for the study of the domains and phase transitions of fe rroelectric a nd ferroelastic single crystals is pin-pointed and the e xperimental set-ups for observations and me as ure ments between 4 and 1600K are outlined. The contrast formation between domains by spontaneous birefringence and reciprocal rotatory power in transmission. and by bireOectance. specular reflection and e tchin g in re flec ted light are co ns ide re d. A s ymme try classificati o n for th e birefringe nce and rotatory power contras t formation is proposed. The use of PLM for ceramic materials e ncounters difficulties, whic h can be overcome hy e nhancing grain g rowth and re ducing sources o f light scattering. So me e xamples are give n, demonstratin g the great powe r of PLM , if used in conjunction with other physical measurements. ~'"""1 IntroductionFerroe lectrics and other materials with phase transiti ons split up into "domains" (Brezina et al. , 1989) upon passage to the low s ymmetry phase. The ir identificati on and the s tudy of their optical properties by polarized light mic rosc opy (PLM) is the main subject o f this contribution. The resolution o f a light microscope is in the mos t favourable case of the order of half a wavelength of light, whe re as with a high resolution e lectron microscope o ne c an see ranges of atom s, incommensurabilities and many mo re Enc de tail, including do mains and domain wa lls.Info rm ati on on the bulk and anisotropy properties may, however, getlosL Fortunately there exists a resolution ran ge, spanning from about half a microme ter to the resolution of the bare human eye (about l OO~m ) , which is most brilliantly covered for anisotropic crystals by the polarizing li ght microscope, permitting great pene tration depths in the trans mission regi me, unequaled in e lectron mic roscopy. For PLM s tudies the availability o f single crystals is o f utmos t importance.

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Reflected polarized light microscopy of the ferroelastic domain structures of YBa2Cu3O7−x

Cited by 10 publications

References 5 publications

Visualizing the Low-Energy Electronic Structure of Prototypical Hybrid Halide Perovskite through Clear Band Measurements

Visualizing the Low-Energy Electronic Structure of Prototypical Hybrid Halide Perovskite through Clear Band Measurements

Optical studies of ferroelectric and ferroelastic domain walls

Polarized Light Microscopy (PLM) of Ferroelectric and Ferroelastic Domains in Transmitted and Reflected Light

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