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Low Energy Excitations In Cuprate High Temperature Superconductors
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Book Synopsis Low Energy Excitations in Cuprate High Temperature Superconductors by : Inna Vishik
Download or read book Low Energy Excitations in Cuprate High Temperature Superconductors written by Inna Vishik and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The mechanism of superconductivity in the cuprate high temperature superconductors is an enduring problem in condensed matter physics, and a detailed experimental phenomenology is a crucial starting point for microscopic understanding. Angle-resolved photoemission spectroscopy (ARPES) measures electronic structure in momentum-space. Low-energy excitations in the cuprates, including the superconducting gap, are known to be anisotropic in momentum space, so the momentum resolution afforded by ARPES is key to understanding the physics and uncovering the mechanism. In this dissertation, I present experiments which pursue the cuprate superconductivity problem from several angles: understanding electron-boson coupling which may be involved in mediating superconductivity (Chapters 6 and 7 and Appendix B), understanding the momentum-space structure of the normal state pseudogap (Chapter 5 and Appendix A), understanding how superconductivity coexists with the pseudogap and other phases (Chapters 3 and 4). Much of this work took advantage of a recent development in ARPES technology, using a UV laser as a light source, which allows experiments to be performed with superior energy and momentum resolution. These experiments highlight the wealth of information that is available in ARPES data, including dispersions, scattering rates, and spectral gaps, and they demonstrate the importance of exploring these variables comprehensively as a function of temperature, doping, and momentum.
Book Synopsis Advances in Theoretical and Experimental Research of High Tc Superconductivity by : Han Rushan
Download or read book Advances in Theoretical and Experimental Research of High Tc Superconductivity written by Han Rushan and published by World Scientific Publishing Company. This book was released on 2019 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: Researchers working at the frontier of high-Tc Superconductors have reviewed the development in this area in the past 20 years. Both experimental and theoretical aspects have been covered. New directions and possible theoretical models were suggested. The contributors of this book are from China Center of Advanced Science and Technology (CCAST); Institute of Physics Chinese Academy of Sciences (CAS); National Lab for Superconductivity, Institute of Physics, CAS; School of Physics, Peking University and Center of Advanced Study Tsinghua University. This volume will be a useful guide to those who are working in the field.
Book Synopsis High-Temperature Cuprate Superconductors by : Nikolay Plakida
Download or read book High-Temperature Cuprate Superconductors written by Nikolay Plakida and published by Springer Science & Business Media. This book was released on 2010-08-26 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt: High-Temperature Cuprate Superconductors provides an up-to-date and comprehensive review of the properties of these fascinating materials. The essential properties of high-temperature cuprate superconductors are reviewed on the background of their theoretical interpretation. The experimental results for structural, magnetic, thermal, electric, optical and lattice properties of various cuprate superconductors are presented with respect to relevant theoretical models. A critical comparison of various theoretical models involving strong electron correlations, antiferromagnetic spin fluctuations, phonons and excitons provides a background for understanding of the mechanism of high-temperature superconductivity. Recent achievements in their applications are also reviewed. A large number of illustrations and tables gives valuable information for specialists. A text-book level presentation with formulation of a general theory of strong-coupling superconductivity will help students and researches to consolidate their knowledge of this remarkable class of materials.
Book Synopsis Low Energy Quasiparticle Excitations in Cuprates and Iron-based Superconductors by : Ken Nakatsukasa
Download or read book Low Energy Quasiparticle Excitations in Cuprates and Iron-based Superconductors written by Ken Nakatsukasa and published by . This book was released on 2018 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: The microscopic properties of the phonon mediated conventional superconductors are well explained by the Bardeen-Cooper-Schrieer (BCS) theory. However, a comprehensive description of the unconventional superconductivity such as the cuprates and iron-based superconductors is still under considerable debate. One of the theories proposed for explaining the pairing mechanism is the spin fluctuation exchange perhaps playing a leading role in inducing the unconventional superconductivity[1]. These materials are thought to be unconventional because they share certain commonalities that are absent in the conventional superconductors. The materials possess variety of phases upon doping including the superconductivity residing in close proximity to magnetism. They show an anisotropic superconducting order parameter. The transition temperatures tend to be higher than those predicted by the conventional electron-phonon couplings. These observations differ from the conventional superconductors indicating that the electron-phonon interactions may be non-factors or play a minimal role in paring. However, a significant phonon renormalization interpreted from photoemission spectroscopy[2], a pronounced isotope effect in cuprates[3], and the emergence of the replica band due to strong forward scattering phonons[4] raise questions regarding the role of phonons in these magnetic superconductors. McMillan and Rowell have studied the low energy excitations seen from a tunneling experiment to prove the electron-phonon coupling was indeed driving the superconductivity, and thus validated the BCS theory[5]. If the unconventional pairing is explained by the exchange of bosons, then one could use the extended version of the BCS theory such as the Eliashberg theory to describe properties of the superconductivity. In the present analysis, we have investigated the low energy features seen in various unconventional superconductors using a fully self-consistent algorithm. We find that the bosonic excitation picture has correctly explained many experimental features, though there were properties. The present analysis has enlightened the picture that the spin fluctuation exchange plays a pivotal role in mediating the pairing; we may further argue that the phonons can play an important role in renormalizing the electronic structure in cuprates; additionally, the forward scattering phonons can coexist with the spin fluctuation exchange to greatly enhance the transition temperature in a selected layered materials.
Book Synopsis Superconductivity of Metals and Cuprates by : J.R Waldram
Download or read book Superconductivity of Metals and Cuprates written by J.R Waldram and published by CRC Press. This book was released on 1996-01-01 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: Superconductivity of Metals and Cuprates covers the basic physics of superconductivity, both the theoretical and experimental aspects. The book concentrates on important facts and ideas, including Ginzburg-Landau equations, boundary energy, Green's function methods, and spectroscopy. Avoiding lengthy or difficult presentations of theory, it is written in a clear and lucid style with many useful, informative diagrams. The book is designed to be accessible to senior undergraduate students, making it a helpful tool for teaching superconductivity as well as serving as an introduction to those entering the field.
Book Synopsis Temperature Dependence of Impurity Resonances in Cuprate Superconductors by : Kamalesh Chatterjee
Download or read book Temperature Dependence of Impurity Resonances in Cuprate Superconductors written by Kamalesh Chatterjee and published by . This book was released on 2009 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: In conventional superconductors the superconducting gap in the electronic excitation spectrum prevents scattering of low energy electrons. In high temperature superconductors (HTS) an additional gap, the pseudogap, develops well above the superconducting transition temperature Tc. The identity of this pseudogap and its relationship to high temperature superconductivity is one of the most interesting outstanding problems in condensed matter physics today. In this thesis I present a new avenue of investigating the pseudogap state, using scanning tunneling microscopy (STM) of resonances generated by single atom scatterers. First, I report that impurity resonance peaks, near zero bias in the excitation spectrum, continue to exist above the superconducting transition temperature and prove that the impurity resonance peak is unchanged through the superconducting transition. I also show that native impurity resonances coexist spatially with the superconducting gap at low temperatures. These findings demonstrate that properties of impurity resonances in HTS are not determined by the nature of the superconducting state, as previously suggested, but instead provide new insights into the pseudogap state. I will further provide preliminary results of doping dependence as a probe to study the pseudogap. In addition to these scientific results, I will also discuss advances I have made in STM instrumentation, from a novel technology to provide the excitation for the coarse approach mechanism of the STM to current amplifier circuits for faster spectroscopy measurements.
Book Synopsis Superconductivity Centennial by : Rushan Han
Download or read book Superconductivity Centennial written by Rushan Han and published by World Scientific. This book was released on 2018-10-09 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers the important contributions of the Chinese during the development of high-temperature superconductors (HTS). The study of Y-based HTS, which was the first to be reported internationally at a liquid nitrogen temperature above 90 K, has retained the world record for superconducting transition temperatures. The book covers the study of superconducting energy gap, microscopic electron non-uniformity, ARPES research, 'kinks' research, eHigh-Tᶜ. In order to provide a comprehensive introduction to the physical properties of condensed matter, this book also includes studies on the thermodynamic properties of high-temperature superconductors, low-temperature heat transport, and Raman spectroscopy. In addition, this book includes important topics in theoretical studies, including the study of the magnetic and superconductivity of iron-based materials, the non-diagonal long procedure in condensed quantum phases, and the creation of oxygen sites in the CuO₂ plane. Rotational fluctuations lead to the study of superconducting states. This book is suitable for researchers and graduate students in condensed matter physics, materials science, optics and other fields.
Book Synopsis High-Temperature Superconductivity in Cuprates by : A. Mourachkine
Download or read book High-Temperature Superconductivity in Cuprates written by A. Mourachkine and published by Springer Science & Business Media. This book was released on 2002-07-31 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main purpose of the book is to present a description of the mechanism of high-temperature superconductivity and to discuss the physics of high-temperature superconductors, both entirely based on experimental facts. The pairing mechanism of this remarkable phenomenon is based on an anomaly found in tunneling (V) characteristics of some cuprates. By using the soliton theory, it is then shown that this anomaly is caused by pairs of quasi-one dimensional excitations - bisolitons - bound due to a moderately strong, nonlinear electron-phonon interaction. At the same time, analysis of experimental data unambiguously shows that magnetic (spin) fluctuations mediate the phase coherence in cuprates. The mechanism of superconductivity in quasi-one dimensional organic superconductors and heavy fermions is discussed too. In cuprates, the origins of five different energy/temperature scales are identified. Finally, three main principles of superconductivity are introduced at the end of the book. Analysis of tunneling and angle-resolved photoemission measurements is presented in the last chapter. The book which contains 300 pages with 180 illustrations is addressed to researchers and graduate students in all branches of exact sciences.
Book Synopsis Studies of High Temperature Superconductors by : A. V. Narlikar
Download or read book Studies of High Temperature Superconductors written by A. V. Narlikar and published by Nova Science Publishers. This book was released on 1990 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: CONTENTS: Weak Coupling Theory of High Temperature Superconductors; Investigations of a Few Novel Series of Thallium Cuprate Superconductors Showing Possible Change in the Sign of Charge Carriers with Composition; Some Structural & Chemical Aspects of the Bi-Pb-Sr-Ca-Cu-O System; High Magnetic Field Studies of High Temperature Superconductors; Fabrication of Bi-Sr-Ca-Cu Oxide Superconductors with Controlled Numbers of Cu-0 Layers; Characterization of High Temperature Superconductors by High Excitation Spectroscopies; Mossbauer Spectroscopy of High Temperature Superconductors; RVB & Related Theories of HTSC; Fabrication of 107k Superconducting Films & Their Normal State Transport Properties; Ion Beam Analysis of High T Superconductors; Thermal Conductivity of High Temperature Superconductor; A New Theoretical Approach to Electron Pairing And Uperconductivity in High T Superconductors; High Resolution Polarized X-Ray Absorption Spectroscopy: Symmetry of the Hole States in High-T Superconductors; Phase Diagrams in the Y-Ba-Cu-O System & Crystal Growth of Ybco Superconductors; Index.
Book Synopsis Evolution of the Excitation Spectrum of Cuprate Superconductors with Doping and Temperature by : Aakash Pushp
Download or read book Evolution of the Excitation Spectrum of Cuprate Superconductors with Doping and Temperature written by Aakash Pushp and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the mechanism by which d-wave superconductivity in the cuprates emerges and is optimized by doping a Mott insulator is one of the major outstanding problems in physics. A key unresolved question in this field is how the strength of electron pairing evolves as a function of doping and temperature and whether pairing strength and the Tc of the sample are related, as they are in simple BCS superconductors. To address these questions, we have developed several new experimental techniques with the scanning tunneling microscope to measure the excitation spectra in the cuprates on the atomic scale as a function of doping and temperature. In this thesis, we will describe these techniques as well as a series of new experiments that reveal a surprisingly simple picture of how superconductivity in the cuprates is optimized. We will first show that over a wide range of doping (optimal to overdoped), the pairing gaps in these systems nucleate in nanoscale regions at temperatures above Tc unlike in the conventional superconductors where the superconducting order parameter sets in at the bulk Tc. These regions proliferate as the temperature is lowered, resulting in a spatial distribution of gap sizes in the superconducting state. Analysis of our data shows no correlation between the inhomogeneous pairing gaps and either the energy scale of the boson modes or the strength of the local electron-boson coupling as measured by the local excitation spectra. This spatially inhomogeneous pairing strength is in fact determined by the unusual electronic excitations of the normal state, suggesting that strong electron-electron interactions rather than low-energy (
Book Synopsis The Gap Symmetry and Fluctuations in High-Tc Superconductors by : Julien Bok
Download or read book The Gap Symmetry and Fluctuations in High-Tc Superconductors written by Julien Bok and published by Springer Science & Business Media. This book was released on 2006-03-07 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the discovery in 1986 of high temperature superconductors by J. G. Bednorz and K. A. Müller, a considerable progress has been made and several important scientific problems have emerged. Within this NATO Advanced Study Institute our intention was to focus mainly on the controversial topic of the symmetry of the superconducting gap and given the very short coherence length, the role of fluctuations. The Institute on ‘The Gap Symmetry and Fluctuations in High- Superconductors’ took place in the “Institut d’Etudes Scientifiques de Cargèse” in Corsica, France, between 1 - 13 September 1997. The 110 participantsfrom 18 countries (yet 30 nationalities) including 23 full time lecturers, have spent two memorable weeks in this charming Mediterranean resort. All lecturers were asked to prepare pedagogical papers to clearly present the central physical idea behind specific model or experiment. The better understanding of physics of high temperature superconductivity is certainly needed to guide the development of applications of these materials in high and weak current devices.
Book Synopsis Phase Separation in Cuprate Superconductors by : Ernst Sigmund
Download or read book Phase Separation in Cuprate Superconductors written by Ernst Sigmund and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phase separation has become a fascinating subject in the discussion of cuprate superconductors. All these materials have layered structures containing CU02 planes as the most important building blocks. They are coupled only weakly so that the electronic properties show a nearly two-dimensional behaviour. Due to correlations the undoped compounds are insulators of the Mott Hubbard type exhibiting long-range antiferromagnetic order. Upon doping a rich scenario of physical phenomena appears: Even at low hole concentra tions the antiferromagnetic ordering temperature is reduced drastically and spin-glass behaviour as well as a hopping type conductivity can be observed. Further doping leads to metallic-like conductivity and below Tc to super conductivity. In this doping regime antiferromagnetic fluctuations are still observed. At very high charge carrier densities superconductivity is lost and the systems show pure metallic conduction without ,magnetic correlations. One of the most interesting phenomena in high-T c research is the interplay between magnetism and conductivity or superconductivity. Especially the behaviour of charge carriers in the antiferromagnetic background raises a number of open questions. Two scenarios become possible: the carriers tend to delocalize over the whole crystal forming a homogeneous state with band-like structure or they separate into hole-rich (conducting, superconducting) and hole-poor (insulating, antiferromagnetic) phases leading to an inhomogeneous structure.
Book Synopsis ARPES Studies of Cuprate Fermiology by :
Download or read book ARPES Studies of Cuprate Fermiology written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present angle-resolved photoemission spectroscopy (ARPES) studies of the cuprate high-temperature superconductors which elucidate the relation between superconductivity and the pseudogap and highlight low-energy quasiparticle dynamics in the superconducting state. Our experiments suggest that the pseudogap and superconducting gap represent distinct states, which coexist below T{sub c}. Studies on Bi-2212 demonstrate that the near-nodal and near-antinodal regions behave differently as a function of temperature and doping, implying that different orders dominate in different momentum-space regions. However, the ubiquity of sharp quasiparticles all around the Fermi surface in Bi-2212 indicates that superconductivity extends into the momentum-space region dominated by the pseudogap, revealing subtlety in this dichotomy. In Bi-2201, the temperature dependence of antinodal spectra reveals particle-hole asymmetry and anomalous spectral broadening, which may constrain the explanation for the pseudogap. Recognizing that electron-boson coupling is an important aspect of cuprate physics, we close with a discussion of the multiple 'kinks' in the nodal dispersion. Understanding these may be important to establishing which excitations are important to superconductivity.
Book Synopsis Superconductivity Research Horizons by : Eugene H. Peterson
Download or read book Superconductivity Research Horizons written by Eugene H. Peterson and published by Nova Publishers. This book was released on 2007 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: Superconductivity is the ability of certain materials to conduct electrical current with no resistance and extremely low losses. High temperature superconductors, such as La2-xSrxCuOx (Tc=40K) and YBa2Cu3O7-x (Tc=90K), were discovered in 1987 and have been actively studied since. In spite of an intense, world-wide, research effort during this time, a complete understanding of the copper oxide (cuprate) materials is still lacking. Many fundamental questions are unanswered, particularly the mechanism by which high-Tc superconductivity occurs. More broadly, the cuprates are in a class of solids with strong electron-electron interactions. This important book brings together leading research in this dynamic field.
Book Synopsis Order and Fluctuations in the Cuprate High Temperature Superconductors by : Erez Berg
Download or read book Order and Fluctuations in the Cuprate High Temperature Superconductors written by Erez Berg and published by . This book was released on 2009 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Studies of the Low-energy Quasiparticle Excitations in High-temperature Superconducting Cuprates with Scanning Tunneling Spectroscopy and Magnetization Measurements by : Andrew David Beyer
Download or read book Studies of the Low-energy Quasiparticle Excitations in High-temperature Superconducting Cuprates with Scanning Tunneling Spectroscopy and Magnetization Measurements written by Andrew David Beyer and published by . This book was released on 2009 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High-Temperature Superconductors by : Ajay Kumar Saxena
Download or read book High-Temperature Superconductors written by Ajay Kumar Saxena and published by Springer Science & Business Media. This book was released on 2012-07-10 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the current knowledge about superconductivity in high Tc cuprate superconductors. There is a large scientific interest and great potential for technological applications. The book discusses all the aspects related to all families of cuprate superconductors discovered so far. Beginning with the phenomenon of superconductivity, the book covers: the structure of cuprate HTSCs, critical currents, flux pinning, synthesis of HTSCs, proximity effect and SQUIDs, possible applications of high Tc superconductors and theories of superconductivity. Though a high Tc theory is still awaited, this book describes the present scenario and BCS and RVB theories. The second edition was significantly extended by including film-substrate lattice matching and buffer layer considerations in thin film HTSCs, brick-wall microstructure in the epitaxial films, electronic structure of the CuO2 layer in cuprates, s-wave and d-wave coupling in HTSCs and possible scenarios of theories of high Tc superconductivity.
