scholarly journals Atomically-resolved interlayer charge ordering and its interplay with superconductivity in YBa2Cu3O6.81

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Chun-Chih Hsu ◽  
Bo-Chao Huang ◽  
Michael Schnedler ◽  
Ming-Yu Lai ◽  
Yuh-Lin Wang ◽  
...  
Keyword(s):  
Carrier Transport ◽  
Charge Order ◽  
Interlayer Coupling ◽  
Real Space ◽  
Charge Ordering ◽  
Atomic Scale ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Cross Sectional ◽  
Competing Orders

AbstractHigh-temperature superconductive (SC) cuprates exhibit not only a SC phase, but also competing orders, suppressing superconductivity. Charge order (CO) has been recognized as an important competing order, but its microscopic spatial interplay with SC phase as well as the interlayer coupling in CO and SC phases remain elusive, despite being essential for understanding the physical mechanisms of competing orders and hence superconductivity. Here we report the achievement of direct real-space imaging with atomic-scale resolution of cryogenically cleaved YBa2Cu3O6.81 using cross-sectional scanning tunneling microscopy/spectroscopy. CO nanodomains are found embedded in the SC phase with a proximity-like boundary region characterized by mutual suppression of CO and superconductivity. Furthermore, SC coherence as well as CO occur on both CuO chain and plane layers, revealing carrier transport and density of states mixing between layers. The CO antiphase correlation along the c direction suggests a dominance of Coulomb repulsion over Josephson tunneling between adjacent layers.

scholarly journals Real-space imaging of the atomic-scale magnetic structure of Fe1+yTe

Science ◽  
2014 ◽  
Vol 345 (6197) ◽  
pp. 653-656 ◽  
Author(s):  
Mostafa Enayat ◽  
Zhixiang Sun ◽  
Udai Raj Singh ◽  
Ramakrishna Aluru ◽  
Stefan Schmaus ◽  
...  
Keyword(s):  
Magnetic Structure ◽  
Magnetic Order ◽  
Parent Compound ◽  
Iron Concentration ◽  
Orthorhombic Phase ◽  
Real Space ◽  
Atomic Scale ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Excess Iron

Spin-polarized scanning tunneling microscopy (SP-STM) has been used extensively to study magnetic properties of nanostructures. Using SP-STM to visualize magnetic order in strongly correlated materials on an atomic scale is highly desirable, but challenging. We achieved this goal in iron tellurium (Fe1+yTe), the nonsuperconducting parent compound of the iron chalcogenides, by using a STM tip with a magnetic cluster at its apex. Our images of the magnetic structure reveal that the magnetic order in the monoclinic phase is a unidirectional stripe order; in the orthorhombic phase at higher excess iron concentration (y > 0.12), a transition to a phase with coexisting magnetic orders in both directions is observed. It may be possible to generalize the technique to other high-temperature superconductor families, such as the cuprates.

Anisotropy in Atomic-Scale Interface Structure and Mobility in Inas/Ga1_Xinxsb Superlattices

1996 ◽  
Vol 448 ◽  
Author(s):  
A. Y. Lew ◽  
S. L. Zuo ◽  
E. T. Yu ◽  
R. H. Miles
Keyword(s):  
Quantitative Analysis ◽  
Molecular Beam ◽  
Interface Structure ◽  
Interface Roughness ◽  
Atomic Scale ◽  
Constant Current ◽  
Scanning Tunneling ◽  
Interfacial Bond ◽  
Tunneling Microscopy ◽  
Cross Sectional

AbstractWe have used cross-sectional scanning tunneling microscopy to study the atomic-scale interface structure of InAs/Ga, _In.xSb superlattices grown by molecular-beam epitaxy. Detailed, quantitative analysis of interface profiles obtained from constant-current images of both (110) and (1ī0) cross-sectional planes of the superlattice indicates that interfaces in the (1ī0) plane exhibit a higher degree of interface roughness than those in the (110) plane, and that the Ga1-xln xAs interfaces are rougher than the InAs-on-Gal1-xInxSb interfaces. The roughness data are consistent with anisotropy in interface structure arising from anisotropic island formation during growth, and in addition with a growth-sequence-dependent interface asymmetry resulting from differences in interfacial bond structure between the superlattice layers. Roughness data are compared with measurements of anisotropy in low-temperature Hall mobilities of the samples.

Atomic‐scale view of AlGaAs/GaAs heterostructures with cross‐sectional scanning tunneling microscopy

1993 ◽  
Vol 63 (9) ◽  
pp. 1273-1275 ◽  
Author(s):  
M. B. Johnson ◽  
U. Maier ◽  
H.‐P. Meier ◽  
H. W. M. Salemink
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Atomic Scale ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Cross Sectional

scholarly journals N−nH complexes in GaAs studied at the atomic scale by cross-sectional scanning tunneling microscopy

2020 ◽  
Vol 102 (12) ◽  
Author(s):  
D. Tjeertes ◽  
T. J. F. Verstijnen ◽  
A. Gonzalo ◽  
J. M. Ulloa ◽  
M. S. Sharma ◽  
...  
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Atomic Scale ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Cross Sectional

scholarly journals Unraveling the atomic structure, ripening behavior, and electronic structure of supported Au20 clusters

2020 ◽  
Vol 6 (1) ◽  
pp. eaay4289 ◽  
Author(s):  
Zhe Li ◽  
Hsin-Yi Tiffany Chen ◽  
Koen Schouteden ◽  
Thomas Picot ◽  
Ting-Wei Liao ◽  
...  
Keyword(s):  
Molecular Orbital ◽  
Gold Nanoclusters ◽  
Real Space ◽  
Atomic Scale ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Free Standing ◽  
Fundamental Information ◽  
Temperature Scanning ◽  
Homo Lumo

The free-standing Au20 cluster has a unique tetrahedral shape and a large HOMO-LUMO (highest occupied molecular orbital–lowest unoccupied molecular orbital) gap of around 1.8 electron volts. The “magic” Au20 has been intensively used as a model system for understanding the catalytic and optical properties of gold nanoclusters. However, direct real-space ground-state characterization at the atomic scale is still lacking, and obtaining fundamental information about the corresponding structural, electronic, and dynamical properties, is challenging. Here, using cluster-beam deposition and low-temperature scanning tunneling microscopy, atom-resolved topographic images and electronic spectra of supported Au20 clusters are obtained. We demonstrate that individual size-selected Au20 on ultrathin NaCl films maintains its pyramidal structure and large HOMO-LUMO gap. At higher cluster coverages, we find sintering of the clusters via Smoluchowski ripening to Au20n agglomerates. The evolution of the electron density of states deduced from the spectra reveals gap reduction with increasing agglomerate size.

Scanning Tunneling Microscopy Studies of GaAs1-xPx Single Crystals

1995 ◽  
Vol 378 ◽  
Author(s):  
X. Liu ◽  
E. R. Weber ◽  
D. F. Ogletree ◽  
M. Salmeron ◽  
T. Slupinski
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Single Crystals ◽  
Spectroscopic Studies ◽  
Atomic Scale ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Cross Sectional ◽  
Group V ◽  
Imaging Results ◽  
The Difference

AbstractWe report cross-sectional scanning tunneling microscopy studies of GaAsP single crystals grown by the Liquid Encapsulated Czochralski technique. We show that the two group-V elements can be clearly distinguished, which is attributed to the difference in energies of surface dangling bond states of As and P. Our atomic scale imaging results show alloy composition in agreement with spectroscopic studies. They also provide valuable information about atomic scale alloy fluctuations and clustering effects.

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