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Author : Paul Johnathan White
Publisher : Unknown
Page : 290 pages
File Size : 55,6 Mb
Release : 2000
Category : Energy gap (Physics)
ISBN : STANFORD:36105017517918
Author : A. V. Narlikar
Publisher : Nova Publishers
Page : 476 pages
File Size : 45,6 Mb
Release : 1993
Category : Technology & Engineering
ISBN : 1560721324
Six papers by physicists from the Japan, India, Brazil and the US address some of the broad frontal issues of superconductivity, which include the mechanisms of high-temperature superconductivity, extra-high-temperature phenomena, the normal state pseudogap, the observations of the isotope effect in a host of different superconducting systems and their explanations, and the unusual features of strongly correlated electron systems like heavy fermions. Two extended papers explore the importance of positron annihilation and using electron spin resonance techniques to study superconducting materials. The treatments should be accessible to working scientists and engineers and to graduate students of physics, chemistry, materials science, solid-state electronics, and other disciplines.
Author : Ece Uykur
Publisher : Springer
Page : 102 pages
File Size : 41,8 Mb
Release : 2015-02-26
Category : Technology & Engineering
ISBN : 9784431555100
In this thesis, the pseudogap and the precursor superconducting state, which are of great importance in clarifying the superconductivity mechanism in high-temperature cuprate superconductors, are investigated with a c-axis optical study in YBa2(Cu1-xZnx)3Oy. Testing was performed over a wide energy range with smaller temperature intervals for several Zn-substituted samples, as well as for several carrier-doping levels. A spectral weight (SW) analysis, in which the pseudogap behavior can be separated from the superconducting condensate with the SW transfer to the high-energy region, revealed that the pseudogap is not the precursor of the superconductivity (carriers moving to the high-energy region with pseudogap opening never contribute to the superconducting condensation). Moreover, the high-energy transfer continues even below Tc for the Zn-substituted samples (in which we weaken the superconductivity), which gives evidence to the coexistence of the pseudogap and the superconducting gap below Tc. On the other hand, the analysis of optical conductivity revealed that a precursor state to superconductivity can be defined at temperatures much higher than Tc. The superconducting carrier density (ns) was calculated for each temperature (above and below Tc) and the results confirmed the existence of ns at temperatures above Tc. The observed real superconducting condensate (ns) above Tc puts a serious constraint on the theory for high- Tc superconductivity. A theory based on an inhomogeneous superconducting state, in which a microscopically phase-separated state in a doped Mott insulator can be observed, is the most plausible candidate. This theory can explain the existence of ns and the observed temperature range for the precursor superconducting state. The results obtained show that the pseudogap coexists with superconductivity below Tc and is not the precursor of superconductivity. On the other hand, it is also possible to define a precursor superconducting state that is different than the pseudogap. The temperature range and the observed superconducting condensate in this state can be explained with the help of the inhomogeneous superconducting state.
Author : Victor Dmitrievich Lakhno
Publisher : Walter de Gruyter GmbH & Co KG
Page : 224 pages
File Size : 45,5 Mb
Release : 2022-08-01
Category : Technology & Engineering
ISBN : 9783110786682
High temperature superconducting theory drew controversy after the discovery of superconductors at close to room temperatures. However, a consistent microscopic theory of HT superconductivity based on bipolaron mechanism leads to a better understanding of microscopic and macroscopic description. By presenting aspects of superconductivity now joined in a strict theory rather than separate models this work is especially useful for graduate students.
Author : Anant Narlikar
Publisher : Nova Publishers
Page : 266 pages
File Size : 55,6 Mb
Release : 1999
Category : Science
ISBN : 1560727357
Studies Of High Temperature Superconductors Volume 29 -- Advances In Research & Applications
Author : Rushan Han
Publisher : World Scientific
Page : 512 pages
File Size : 55,6 Mb
Release : 2020-05-22
Category : Science
ISBN : 9789813271180
This book is indexed in Chemical Abstracts ServiceResearchers 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.
Author : A. V. Narlikar
Publisher : Springer Science & Business Media
Page : 536 pages
File Size : 43,8 Mb
Release : 2004
Category : Science
ISBN : 354040631X
In contrast to research on the fundamental mechanisms of High-Temperature Superconductivity, in recent years we have seen enormous developments in the fabrication and application of High-Tc-superconductors. The two volumes of High Temperature Superconductivity provide a survey of the state of the technology and engineering applications of these materials. They comprise extended original research papers and technical review articles written by physicists, chemists, materials scientists and engineers, all of them noted experts in their fields. The interdisciplinary and strictly application-oriented coverage should benefit graduate students and academic researchers in the mentioned areas as well as industrial experts. Volume 1 "Materials" focuses on major technical advancements in High-Tc materials processing for applications. Volume 2 "Engineering Applications" covers numerous application areas where High-Tc superconductors are making tremendous impact.
Author : Nikolay Plakida
Publisher : Springer Science & Business Media
Page : 570 pages
File Size : 49,6 Mb
Release : 2010-08-26
Category : Technology & Engineering
ISBN : 9783642126338
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.
Author : Julien Bok,Guy Deutscher,Davor Pavuna,Stuart A. Wolf
Publisher : Springer Science & Business Media
Page : 560 pages
File Size : 54,8 Mb
Release : 2006-03-07
Category : Science
ISBN : 9780306470813
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.
Author : R. Kossowsky,Bernard Raveau,Dieter Wohlleben,Stamatis K. Patapis
Publisher : Springer Science & Business Media
Page : 798 pages
File Size : 49,5 Mb
Release : 2012-12-06
Category : Science
ISBN : 9789401124621
Physics and Materials Science of High Temperature Superconductors, II represents the results of a fruitful dialogue between physicists and materials scientists which took place under the auspices of a NATO Advanced Study Institute in Porto Carras, Greece, between 18 and 31 August, 1991. It builds on and carries forward the success of NATO ASI 181 published in 1990. The theoretical side of the discussions reveal the basic premise of the phenomenological and Ginzburg-Landau theories of superconductivity, the implications of short coherence length, long penetration depth, the melting of flux lattices, and other matters, while the materials science includes discussions of microstructures, local inhomogeneities, deviations from ideal chemistry, the effects of systematic errors in materials preparation, the definition of imperfections, and the utilization of common materials analysis techniques. The reader will be made aware of the potential significance of Angstrom scale structural and chemical details, and the need to consider basic theoretical concepts when designing procedures to process viable, solid conductors, specifically the effects of oxygen stoichiometry and deviations from it, as well as the microstructural demands on pinning in the light of very short coherence lengths.
Author : Antonio Bianconi
Publisher : Springer Science & Business Media
Page : 256 pages
File Size : 50,8 Mb
Release : 2006
Category : High temperature superconductivity
ISBN : 1402039875
Author : Donald M. Ginsberg
Publisher : World Scientific
Page : 644 pages
File Size : 51,6 Mb
Release : 1992
Category : Technology & Engineering
ISBN : 9810208758
This volume brings the reader up to date on transport phenomena, including electrical and thermal conductivity and infrared properties. In addition, electron tunneling and the characteristics and applications of films are discussed; the preparation of the necessary samples has proceeded, and a sizeable body of reproducible data has become available. Pressure effects are also presented; considerable progress has been made in relating them to the crystallographic and electronic structure of high temperature superconductors. The preparation and characterization of bulk samples is also reviewed.
Author : T Schneider,J M Singer
Publisher : World Scientific
Page : 444 pages
File Size : 51,8 Mb
Release : 2000-05-24
Category : Technology & Engineering
ISBN : 9781783261635
The discovery of superconductivity at 30 K by Bednorz and Müller in 1986 ignited an explosion of interest in high temperature superconductivity. The initial development rapidly evolved into an intensive worldwide research effort — which still persists after more than a decade — to understand the phenomenon of cuprate superconductivity, to search for ways to raise the transition temperature and to produce materials which have the potential for technological applications. During the past decade of research on this subject, significant progress has been made on both the fundamental science and technological application fronts. A great deal of experimental data is now available on the cuprates, and various properties have been well characterized using high quality single crystals and thin films. Despite this enormous research effort, however, the underlying mechanisms responsible for superconductivity in the cuprates are still open to question. This book offers an understanding from the phase transition point of view, surveys and identifies thermal and quantum fluctuation effects, identifies material-independent universal properties and provides constraints for the microscopic description of the various phenomena. The text is presented in a format suitable for use in a graduate level course. Contents:Ginzburg–Landau PhenomenologyGaussian Thermal FluctuationsSuperfluidity and the n-Vector ModelUniversality and Scaling Theory of Classical Critical Phenomena at Finite TemperatureExperimental Evidence for Classical Critical BehaviorQuantum Phase TransitionsImplicationsMean Field TreatmentXY ModelQuantum Phase TransitionsBCS TheorySuperconducting Properties of the Attractive Hubbard Model Readership: Researchers and graduate students interested in superconductivity. Keywords:High Temperature Superconductivity;Cuprate Superconductors;Ginzburg-Landau Phenomenology;Gaussian Thermal Fluctuations
Author : A.G. Mamalis
Publisher : CRC Press
Page : 268 pages
File Size : 42,8 Mb
Release : 2019-04-23
Category : Science
ISBN : 9781420014266
The discovery of high-temperature superconductivity [1986] by Bendnorz and Muller in the La-BA-Cu-O system resulted in very extensive research work about the discovery and synthesis of other high-temperature superconductors, such as Y-BA-Cu-O and Bi-Sr-Ca-Cu-O. These new superconducting materials, possessing superconductivity above liquid nitrogen
Author : Donald M. Ginsberg
Publisher : World Scientific
Page : 484 pages
File Size : 55,5 Mb
Release : 1996
Category : Technology & Engineering
ISBN : 9810233582
The publication of Volume V of Physical Properties of High Temperature Superconductors is expected in March, 1996. It will have chapters of interest for both fundamental studies and applied research. The topics discussed are expected to include the electromagnetic response (penetration depth and surface resistance), local lattice distortions, the influence of vortex fluctuations on macroscopic behavior, the properties of superlattices, and the symmetry of the superconducting order parameter.