Author: Seth Cullen WhitePublisher:
ISBN:
Category :
Languages : en
Pages : 99
Book Description
Setup and Operation of a Spectroscopic Imaging STM for the Study of Iron-based Superconductors
Author: Seth Cullen WhiteSchackert, Michael PeterScanning Tunneling Spectroscopy on Electron-Boson Interactions in Superconductors
Author: Schackert, Michael PeterPublisher: KIT Scientific Publishing
ISBN: 3731502380
Category : Physics
Languages : en
Pages : 148
Book Description
This work describes the experimental study of electron-boson interactions in superconductors by means of inelastic electron tunneling spectroscopy performed with a scanning tunneling microscope (STM) at temperatures below 1 K. This new approach allows the direct measurement of the Eliashberg function of conventional superconductors as demonstrated on lead (Pb) and niobium (Nb). Preparative experiments on unconventional iron-pnictides are presented in the end.
Construction and Operation of a Milli-Kelvin Spectroscopic Imaging STM for the Study of Correlated Electron Materials
Author: Seyedmostafa EnayatCharge Dynamics in 122 Iron-Based Superconductors
Author: Aliaksei CharnukhaPublisher: Springer Science & Business Media
ISBN: 3319011928
Category : Technology & Engineering
Languages : en
Pages : 139
Book Description
This thesis combines highly accurate optical spectroscopy data on the recently discovered iron-based high-temperature superconductors with an incisive theoretical analysis. Three outstanding results are reported: (1) The superconductivity-induced modification of the far-infrared conductivity of an iron arsenide with minimal chemical disorder is quantitatively described by means of a strong-coupling theory for spin fluctuation mediated Cooper pairing. The formalism developed in this thesis also describes prior spectroscopic data on more disordered compounds. (2) The same materials exhibit a sharp superconductivity-induced anomaly for photon energies around 2.5 eV, two orders of magnitude larger than the superconducting energy gap. The author provides a qualitative interpretation of this unprecedented observation, which is based on the multiband nature of the superconducting state. (3) The thesis also develops a comprehensive description of a superconducting, yet optically transparent iron chalcogenide compound. The author shows that this highly unusual behavior can be explained as a result of the nanoscopic coexistence of insulating and superconducting phases, and he uses a combination of two complementary experimental methods - scanning near-field optical microscopy and low-energy muon spin rotation - to directly image the phase coexistence and quantitatively determine the phase composition. These data have important implications for the interpretation of data from other experimental probes.
Visualising the Charge and Cooper-Pair Density Waves in Cuprates
Author: Stephen EdkinsPublisher: Springer
ISBN: 3319659758
Category : Technology & Engineering
Languages : en
Pages : 193
Book Description
This thesis reports on the use of scanning tunnelling microscopy to elucidate the atomic-scale electronic structure of a charge density wave, revealing that it has a d-symmetry form factor, hitherto unobserved in nature. It then details the development of an entirely new class of scanned probe: the scanning Josephson tunnelling microscope. This scans the Josephson junction formed between a cuprate superconducting microscope tip and the surface of a cuprate sample, thereby imaging the superfluid density of the sample with nanometer resolution. This novel method is used to establish the existence of a spatially modulated superconducting condensate, something postulated theoretically over half a century ago but never previously observed.
Science
Author: John Michels (Journalist)Publisher:
ISBN:
Category : Science
Languages : en
Pages : 962
Book Description
Scanning Tunneling Microscopy and Spectroscopy
Author: Dawn BonnellPublisher: Wiley
ISBN: 9780471187356
Category : Science
Languages : en
Pages : 436
Book Description
Scanning tunneling microscopy (STM) provides three-dimensional real- space images of surfaces at high spatial resolution. When the surface is flat and clean, even atoms can be imaged. Its extreme usefulness has led it to near instantaneous acceptance as a characterization tool. This book covers fundamental concepts of STM operation, image interpretation, instrumentation, and techniques for various applications. It als contains advanced treatments of theory and spectroscopy. Surface physicists, electrochemists, materials scientists, and other scientists who see a use for STM will find the depth of coverage and accompanying reference lists in this book essential to their work. In addition, those who wish to add the capabilities of probe microscopy to their operations, such as microscopists and quality control engineers, will find the basic information in this book.
Scientific and Technical Aerospace Reports
Author: On the Properties of Novel Superconductors
Author: Heshmatollah YavariPublisher: BoD – Books on Demand
ISBN: 1789840651
Category : Science
Languages : en
Pages : 110
Book Description
Since the discovery of superconductivity, a great number of theoretical and experimental efforts have been made to describe this new phase of matter that emerged in many body systems. In this regard, theoretical models have been presented; the most famous of which was the BCS theory that can only describe conventional superconductors. With the discovery of new class superconductors, the superconducting mechanism became a new challenge in the field of condensed matter physics. This unexpected discovery opened a new area in the history of superconductivity, and experimental researchers started trying to find new compounds in this class of superconductors. These superconductors are often characterized by the anisotropic character in the superconducting gap function with nodes along a certain direction in the momentum space. Since the pairing interaction has an important role in the superconducting gap structure, its determination is very important to explain the basic pairing mechanism.In this regard, this book includes valuable theoretical and experimental discussions about the properties of superconductors. Here you will find valuable research describing the properties of unconventional superconductors.
Theory Of Superconductivity
Author: J. Robert SchriefferPublisher: CRC Press
ISBN: 0429964250
Category : Science
Languages : en
Pages : 352
Book Description
Theory of Superconductivity is primarily intended to serve as a background for reading the literature in which detailed applications of the microscopic theory of superconductivity are made to specific problems.