“Wave-Function Imaging” Studies of High-Tc Superconductivity

MRS Bulletin ◽  
2005 ◽  
Vol 30 (6) ◽  
pp. 437-441 ◽  
Author(s):  
James A. Slezak ◽  
Jinho Lee ◽  
J. C. Davis
Keyword(s):  
Electronic Structure ◽  
Momentum Space ◽  
High Temperature Superconductivity ◽  
Inelastic Neutron Scattering ◽  
Real Space ◽  
Inelastic Neutron ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Carrier Doping ◽  
Localized Electrons

AbstractHigh-temperature superconductivity in the cuprates emerges when the localized electrons of a Mott insulator become mobile due to carrier doping. Understanding both the electronic ground state and the excited states of these systems are key challenges in physics today. Angle-resolved photoemission spectroscopy (ARPES) and inelastic neutron-scattering (INS) studies have been remarkably successful in mapping the momentum-space characteristics of the cuprate electronic structure. However, since cuprate superconductivity develops from atomically localized electrons and exhibits nanoscale disorder, a pure momentum-space description is unlikely to be sufficient. Instead, simultaneous information on electronic structure at the nanoscale in real space, and throughout momentum space, is required. Here, we describe a combination of novel spectroscopic imaging scanning tunneling microscopy (SI-STM) techniques that we have developed to achieve these apparently contradictory aims, along with the outcome of a series of SI-STM studies of the electronic structure of Bi2Sr2CaCu2O8+x.

Probing nucleation and growth phenomena on silicon surfaces by scanning tunneling microscopy/spectroscopy

1989 ◽  
Vol 47 ◽  
pp. 28-29
Author(s):  
R.J. Hamers ◽  
U.K. Kohler ◽  
K. Markert ◽  
J.E. Demuth
Keyword(s):  
Electronic Structure ◽  
Scanning Tunneling Microscopy ◽  
Chemical Reactivity ◽  
Real Space ◽  
Nucleation And Growth ◽  
Silicon Surfaces ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Surface Geometry ◽  
Local Electronic Structure

Nucleation and growth processes have long been studied using diffraction technique On semiconductor surfaces, localized defects strongly affect both the electron properties of the surfaces as well as their reactivity, therby affecting nucleat and growth. In order to identify the role of local electronic structure, and surface irregularities such as steps and defects, a real-space probe of electronic structure is needed. Scanning tunneling microscopy is capable of probing both the local surface geometry and local electronic structure, permitting adsorption and chemical reactivity to be studied on an atom-by-atom basis.

Effects of Magnetic Collective Modes in the Tunneling Spectra of High-Tc Superconductors

2003 ◽  
Vol 17 (18n20) ◽  
pp. 3473-3478
Author(s):  
Jian-Xin Zhu ◽  
A. V. Balatsky ◽  
Jun Sun ◽  
Qimiao Si
Keyword(s):  
Inelastic Neutron Scattering ◽  
Local Density ◽  
High Temperature Superconductors ◽  
High Energy ◽  
Inelastic Neutron ◽  
Collective Modes ◽  
Scanning Tunneling ◽  
Tunneling Conductance ◽  
Checkerboard Pattern ◽  
Tunneling Microscopy

High-energy spin collective modes are often observed in inelastic neutron scattering experiments for high-temperature superconductors. Motivated by the recent scanning tunneling microscopy (STM) observation of the "checkerboard" pattern in the tunneling conductance in superconducting Bi 2 Sr 2 CaCu 2 O 8+δ, we study the effects of these high-energy dynamic spin collective modes on the local density of states (LDOS). Unlike other scenarios recently proposed, we do not assume the pinning of the collective mode. The exchange coupling between the superconducting electrons and the collective modes produces high energy peaks in the LDOS. The spatial dependence of the LDOS at high resonant energy suggests a possible detection of resonant magnetic mode with the STM.

Nematic Electronic Structure in the “Parent” State of the Iron-Based Superconductor Ca(Fe1–xCox)2As2

Science ◽  
2010 ◽  
Vol 327 (5962) ◽  
pp. 181-184 ◽  
Author(s):  
T.-M. Chuang ◽  
M. P. Allan ◽  
Jinho Lee ◽  
Yang Xie ◽  
Ni Ni ◽  
...  
Keyword(s):  
Electronic Structure ◽  
High Temperature Superconductivity ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Iron Based Superconductors ◽  
Bulk Properties ◽  
Quasiparticle Interference ◽  
Parent State ◽  
Nematic State ◽  
Iron Based

The mechanism of high-temperature superconductivity in the newly discovered iron-based superconductors is unresolved. We use spectroscopic imaging–scanning tunneling microscopy to study the electronic structure of a representative compound CaFe1.94Co0.06As2 in the “parent” state from which this superconductivity emerges. Static, unidirectional electronic nanostructures of dimension eight times the inter–iron-atom distance aFe-Fe and aligned along the crystal a axis are observed. In contrast, the delocalized electronic states detectable by quasiparticle interference imaging are dispersive along the b axis only and are consistent with a nematic α2 band with an apparent band folding having wave vector q≅±22π/8aFe-Fe along the a axis. All these effects rotate through 90 degrees at orthorhombic twin boundaries, indicating that they are bulk properties. As none of these phenomena are expected merely due to crystal symmetry, underdoped ferropnictides may exhibit a more complex electronic nematic state than originally expected.

Room temperature observation of the correlation between atomic and electronic structure of graphene on Cu(110)

RSC Advances ◽  
2016 ◽  
Vol 6 (100) ◽  
pp. 98001-98009 ◽  
Author(s):  
Thais Chagas ◽  
Thiago H. R. Cunha ◽  
Matheus J. S. Matos ◽  
Diogo D. dos Reis ◽  
Karolline A. S. Araujo ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Chemical Vapor Deposition ◽  
Scanning Tunneling Microscopy ◽  
Vapor Deposition ◽  
Room Temperature ◽  
Chemical Vapor ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Temperature Observation ◽  
Atomic And Electronic Structure

We have used atomically-resolved scanning tunneling microscopy and spectroscopy to study the interplay between the atomic and electronic structure of graphene formed on copper via chemical vapor deposition.

Local Electronic Structure in Ordered Aggregates of Carbon Nanotubes: Scanning Tunneling Microscopy/scanning Tunneling Spectroscopy Study

1998 ◽  
Vol 13 (9) ◽  
pp. 2389-2395 ◽  
Author(s):  
D. L. Carroll ◽  
P. M. Ajayan ◽  
S. Curran
Keyword(s):  
Carbon Nanotubes ◽  
Electronic Structure ◽  
Scanning Tunneling Microscopy ◽  
Local Density ◽  
Scanning Tunneling Spectroscopy ◽  
Tunneling Spectroscopy ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Spatially Resolved ◽  
Local Electronic Structure

The recent application of tunneling probes in electronic structure studies of carbon nanotubes has proven both powerful and challenging. Using scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS), local electronic properties in ordered aggregates of carbon nanotubes (multiwalled nanotubes and ropes of single walled nanotubes) have been probed. In this report, we present evidence for interlayer (concentric tube) interactions in multiwalled tubes and tube-tube interactions in singlewalled nanotube ropes. The spatially resolved, local electronic structure, as determined by the local density of electronic states, is shown to clearly reflect tube-tube interactions in both of these aggregate forms.

Morphology and electronic structure of Gd wires studied with scanning tunneling microscopy

1998 ◽  
Vol 66 (7) ◽  
pp. S1195-S1198 ◽  
Author(s):  
A. Mühlig ◽  
T. Günther ◽  
A. Bauer ◽  
K. Starke ◽  
B.L. Petersen ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Scanning Tunneling Microscopy ◽  
Scanning Tunneling ◽  
Tunneling Microscopy

scholarly journals Surface science at the PEARL beamline of the Swiss Light Source

2017 ◽  
Vol 24 (1) ◽  
pp. 354-366 ◽  
Author(s):  
Matthias Muntwiler ◽  
Jun Zhang ◽  
Roland Stania ◽  
Fumihiko Matsui ◽  
Peter Oberta ◽  
...  
Keyword(s):  
Light Source ◽  
Surface Science ◽  
Photoelectron Spectroscopy ◽  
Hexagonal Boron Nitride ◽  
Real Space ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
X Ray ◽  
Photoelectron Diffraction ◽  
Swiss Light Source

The Photo-Emission and Atomic Resolution Laboratory (PEARL) is a new soft X-ray beamline and surface science laboratory at the Swiss Light Source. PEARL is dedicated to the structural characterization of local bonding geometry at surfaces and interfaces of novel materials, in particular of molecular adsorbates, nanostructured surfaces, and surfaces of complex materials. The main experimental techniques are soft X-ray photoelectron spectroscopy, photoelectron diffraction, and scanning tunneling microscopy (STM). Photoelectron diffraction in angle-scanned mode measures bonding angles of atoms near the emitter atom, and thus allows the orientation of small molecules on a substrate to be determined. In energy scanned mode it measures the distance between the emitter and neighboring atoms; for example, between adsorbate and substrate. STM provides complementary, real-space information, and is particularly useful for comparing the sample quality with reference measurements. In this article, the key features and measured performance data of the beamline and the experimental station are presented. As scientific examples, the adsorbate–substrate distance in hexagonal boron nitride on Ni(111), surface quantum well states in a metal-organic network of dicyano-anthracene on Cu(111), and circular dichroism in the photoelectron diffraction of Cu(111) are discussed.

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