Electromagnetic Absorption in the Copper Oxide Superconductors PDF Download
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Author: Frank J. Owens
Publisher: Springer Science & Business Media
ISBN: 0306470829
Category : Technology & Engineering
Languages : en
Pages : 199
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Book Description
In 1987 a major breakthrough occurred in materials science. A new family of materials was discovered that became superconducting above the temperature at which nitrogen gas liquifies, namely, 77 K or –196°C. Within months of the discovery, a wide variety of experimental techniques were brought to bear in order to measure the properties of these materials and to gain an understanding of why they superconduct at such high temperatures. Among the techniques used were electromagnetic absorption in both the normal and the superconducting states. The measurements enabled the determination of a wide variety of properties, and in some instances led to the observation of new effects not seen by other measu- ments, such as the existence of weak-link microwave absorption at low dc magnetic fields. The number of different properties and the degree of detail that can be obtained from magnetic field- and temperature-dependent studies of electromagnetic abso- tion are not widely appreciated. For example, these measurements can provide information on the band gap, critical fields, the H–T irreversibility line, the amount of trapped flux, and even information about the symmetry of the wave function of the Cooper pairs. It is possible to use low dc magnetic field-induced absorption of microwaves with derivative detection to verify the presence of superconductivity in a matter of minutes, and the measurements are often more straightforward than others. For example, they do not require the physical contact with the sample that is necessary when using four-probe resistivity to detect superconductivity.
Author: Frank J. Owens
Publisher: Springer Science & Business Media
ISBN: 0306470829
Category : Technology & Engineering
Languages : en
Pages : 199
Get Book
Book Description
In 1987 a major breakthrough occurred in materials science. A new family of materials was discovered that became superconducting above the temperature at which nitrogen gas liquifies, namely, 77 K or –196°C. Within months of the discovery, a wide variety of experimental techniques were brought to bear in order to measure the properties of these materials and to gain an understanding of why they superconduct at such high temperatures. Among the techniques used were electromagnetic absorption in both the normal and the superconducting states. The measurements enabled the determination of a wide variety of properties, and in some instances led to the observation of new effects not seen by other measu- ments, such as the existence of weak-link microwave absorption at low dc magnetic fields. The number of different properties and the degree of detail that can be obtained from magnetic field- and temperature-dependent studies of electromagnetic abso- tion are not widely appreciated. For example, these measurements can provide information on the band gap, critical fields, the H–T irreversibility line, the amount of trapped flux, and even information about the symmetry of the wave function of the Cooper pairs. It is possible to use low dc magnetic field-induced absorption of microwaves with derivative detection to verify the presence of superconductivity in a matter of minutes, and the measurements are often more straightforward than others. For example, they do not require the physical contact with the sample that is necessary when using four-probe resistivity to detect superconductivity.
Author: Frank J. Owens
Publisher:
ISBN: 9781475787597
Category :
Languages : en
Pages : 216
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Book Description
Author: Frank J. Owens
Publisher: Springer
ISBN: 9781475787603
Category : Technology & Engineering
Languages : en
Pages : 199
Get Book
Book Description
In 1987 a major breakthrough occurred in materials science. A new family of materials was discovered that became superconducting above the temperature at which nitrogen gas liquifies, namely, 77 K or –196°C. Within months of the discovery, a wide variety of experimental techniques were brought to bear in order to measure the properties of these materials and to gain an understanding of why they superconduct at such high temperatures. Among the techniques used were electromagnetic absorption in both the normal and the superconducting states. The measurements enabled the determination of a wide variety of properties, and in some instances led to the observation of new effects not seen by other measu- ments, such as the existence of weak-link microwave absorption at low dc magnetic fields. The number of different properties and the degree of detail that can be obtained from magnetic field- and temperature-dependent studies of electromagnetic abso- tion are not widely appreciated. For example, these measurements can provide information on the band gap, critical fields, the H–T irreversibility line, the amount of trapped flux, and even information about the symmetry of the wave function of the Cooper pairs. It is possible to use low dc magnetic field-induced absorption of microwaves with derivative detection to verify the presence of superconductivity in a matter of minutes, and the measurements are often more straightforward than others. For example, they do not require the physical contact with the sample that is necessary when using four-probe resistivity to detect superconductivity.
Author: Frank J. Owens
Publisher: John Wiley & Sons
ISBN: 0470067403
Category : Technology & Engineering
Languages : en
Pages : 557
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Book Description
A comprehensive textbook that addresses the recent interest in nanotechnology in the engineering, materials science, chemistry, and physics communities In recent years, nanotechnology has become one of the most promising and exciting fields of science, triggering an increasing number of university engineering, materials science, chemistry, and physics departments to introduce courses on this emerging topic. Now, Drs. Owens and Poole have revised, updated, and revamped their 2003 work, Introduction to Nanotechnology, to make it more accessible as a textbook for advanced undergraduate- and graduate-level courses on the fascinating field of nanotechnology and nanoscience. The Physics and Chemistry of Nanosolids takes a pedagogical approach to the subject and assumes only an introductory understanding of the physics and chemistry of macroscopic solids and models developed to explain properties, such as the theory of phonon and lattice vibrations and electronic band structure. The authors describe how properties depend on size in the nanometer regime and explain why these changes occur using relatively simple models of the physics and chemistry of the solid state. Additionally, this accessible book: Provides an introductory overview of the basic principles of solids Describes the various methods used to measure the properties of nanosolids Explains how and why properties change when reducing the size of solids to nano-dimensions, and what they predict when one or more dimensions of a solid has a nano-length Presents data on how various properties of solids are affected by nanosizing and examines why these changes occur Contains a chapter entirely devoted to the importance of carbon nanostructured materials and the potential applications of carbon nanostructures The Physics and Chemistry of Nanosolids is complete with a series of exercises at the end of each chapter for readers to enhance their understanding of the material presented, making this an ideal textbook for students and a valuable tutorial for technical professionals and researchers who are interested in learning more about this important topic.
Author: Lawrence H Bennett
Publisher: World Scientific
ISBN: 9813201398
Category : Technology & Engineering
Languages : en
Pages : 437
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Book Description
This Workshop addresses the role of magnetic interactions in the various aspects of high Tc superconducting materials, including the fundamental nature of the elementary excitations and their effect on the measured microscopic and macroscopic magnetic properties of these materials. Applications involving the magnetic behaviour of high Tc superconductors is a special feature of this Workshop.
Author: Antonio Bianconi
Publisher: Springer Science & Business Media
ISBN: 0306471000
Category : Technology & Engineering
Languages : en
Pages : 557
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Book Description
The problem of superconductors has been a central issue in Solid State Physics since 1987. After the discovery of superconductivity (HTSC) in doped perovskites, it was realized that the HTSC appears in an unknown complex electronic phase of c- densed matter. In the early years, all theories of HTSC were focused on the physics of a homogeneous 2D metal with large electron–electron correlations or on a 2D polaron gas. Only after 1990, a novel paradigm started to grow where this 2D metallic phase is described as an inhomogeneous metal. This was the outcome of several experimental evidences of phase separation at low doping. Since 1992, a series of conferences on phase separation were organized to allow scientists to get together to discuss the phase separation and related issues. Following the discovery by the Rome group in 1992 that “the charges move freely mainly in one direction like the water running in the grooves in the corrugated iron foil,” a new scenario to understand superconductivity in the superconductors was open. Because the charges move like rivers, the physics of these materials shifts toward the physics of novel mesoscopic heterostructures and complex electronic solids. Therefore, understanding the striped phases in the perovskites not only provides an opportunity to understand the anomalous metallic state of cuprate superconductors, but also suggests a way to design new materials of technological importance. Indeed, the stripes are becoming a field of general scientific interest.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 920
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Book Description
Author: Sushil K. Misra
Publisher: John Wiley & Sons
ISBN: 3527633553
Category : Science
Languages : en
Pages : 990
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Book Description
Filling the gap for a systematic, authoritative, and up-to-date review of this cutting-edge technique, this book covers both low and high frequency EPR, emphasizing the importance of adopting the multifrequency approach to study paramagnetic systems in full detail by using the EPR method. In so doing, it discusses not only the underlying theory and applications, but also all recent advances -- with a final section devoted to future perspectives.
Author: Alex K. Muller
Publisher: World Scientific Publishing Company
ISBN: 9789814354837
Category : Science
Languages : en
Pages : 0
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Book Description
The aim of this book is to clarify the situation by adopting a very different approach from the above electronic/magnetic models, where explicitly local dynamical distortions are considered. These are distinctly different from conventional phonons which are a property of the infinite translational invariant symmetric lattice. The local dynamical distortions are shown to account for bulk properties and provide consistent and quantitative agreement with experimental data together with explicit predictions. Selected published experimental and theoretical papers are presented which support the above arguments, but have been ignored on purpose by the originators of the RVB/t-J bubble. To summarize the scope of this book, comprising nine chapters, it is shown, that the phenomenon of HTS in copper oxides is much better understood than publically claimed by RVB/t-J followers. Using the words of B. Laughlin, the presence of the antiferromagnetism in HTS masks the underlying physics where vibronic bipolarons with spin S=0 are the major players. Furthermore is it worth mentioning, that the newly discovered Fe based layered compounds are rather closely related to the copper oxides which near degenerate bands due to the vibronic coupling of the copper-oxygen units with Jahn-Teller character. Analogous to the latter the Fe based superconductors exhibit almost degenerate wave vector independent bands near the Fermi energy stemming from the tetrahedrally coordinated Jahn-Teller active two-valent iron ion.
Author: Charles P. Poole, Jr.
Publisher: John Wiley & Sons
ISBN: 9780471079354
Category : Technology & Engineering
Languages : en
Pages : 408
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Book Description
This self-confessed introduction provides technical administrators and managers with a broad, practical overview of the subject and gives researchers working in different areas an appreciation of developments in nanotechnology outside their own fields of expertise.
