De Haas Van Alphen Effect in High Temperature Superconductors PDF Download
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Author:
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ISBN:
Category :
Languages : en
Pages : 17
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Book Description
The de Haas van Alphen effect has been investigated using 100 tesla fields and temperatures below 4.2 Kelvin. It is concluded from these measurements that YBCO exhibits a Fermi surface with at least three separate extremal frequencies for the c-axis parallel to the applied field. Orbital masses, renormalization g's and scattering rates are estimated from an amplitude analysis. 16 refs., 2 figs.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 17
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Book Description
The de Haas van Alphen effect has been investigated using 100 tesla fields and temperatures below 4.2 Kelvin. It is concluded from these measurements that YBCO exhibits a Fermi surface with at least three separate extremal frequencies for the c-axis parallel to the applied field. Orbital masses, renormalization g's and scattering rates are estimated from an amplitude analysis. 16 refs., 2 figs.
Author: Leon Gunther
Publisher:
ISBN:
Category :
Languages : en
Pages : 10
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Book Description
The report shows that the critical temperature T sub c(H) of a type-II superconductor exhibits dHvA oscillations with the usual period mu/omega sub c, where mu is the Fermi energy and omega sub c = eH/mc is the cyclotron frequency. The result includes electron spin and is valid even outside the Ginzburg-Landau region. It demonstrates the feasibility of observing the effect at low temperatures through the oscillations of the resistivity in the transition region. (Author).
Author: Robin Corcoran
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Josef Ashkenazi
Publisher: Springer Science & Business Media
ISBN:
Category : Science
Languages : en
Pages : 688
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Book Description
Proceedings of the University of Miami Workshop on Electronic Structure and Mechanisms of High-Temperature Superconductivity, held January 1991, in Coral Gables, Florida. Experimental work in this volume includes reports of photoemission spectra, positron annihilation, the de Haas-van Alphen effect,
Author: Donald M Ginsberg
Publisher: World Scientific
ISBN: 9813221798
Category : Science
Languages : en
Pages : 642
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Book Description
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: Sadamichi Maekawa
Publisher: Springer Science & Business Media
ISBN: 3642847188
Category : Technology & Engineering
Languages : en
Pages : 427
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Book Description
Advances through carefully conducted quantitative work on well designed, high quality materials characterize the present state of high-temperature superconductivity research. The contributions to this volume present a theoretical and experimental overview of electronic structure and physical properties, including anisotropic features, of high-temperative materials, with a focus on cuprates. In order to enhance the understanding of the mechanisms of superconductivity at high temperatures, this volume is divided into theoretical and experimental parts. The contributions to the two parts correspond to each other, giving readers involved in either area of research activity a reference to findingsof the other. On the other hand, this book gives young physicists high-level information on the present state of research, enhanced by tutorial contributions of leading physicists in the field.
Author: Koji Kajimura
Publisher: Springer Science & Business Media
ISBN: 4431681418
Category : Technology & Engineering
Languages : en
Pages : 1312
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Book Description
Since the discovery of high temperature superconductors, many new materials have been invented. In the last year, several new materials were also discovered, but their critical temperatures are still below lOOK. Precise physical and chemical work has made tremendous progress in the theoretical and experimental study of physical properties and carrier state characterizations. The de Haas van Alphen effect measurement showed the existence of a Fermi surface in YBCO. Flux dynamics is a well-known new problem in which flux creep and irreversibility line features are especially important for a fundamental understanding of the critical current and flux pinning. Flux pinning centers which are intentionally added using non-superconducting precipitates, neutrons, and protons, etc. increase critical currents to practical levels. The analysis of electric and magnetic properties are expected to reveal the pinning mechanism and also to further application development. As for wires and bulks, many melt-like sintering techniques have improved the material performance of critical current densities. A new seeding Quench-Melt Growth technique enlarged crystal size and increased the repulsion force. These melting processes, in conjunction with a mechanical strength improvement have been effectively introduced into wire fabrication in order to realize kilometer range wires and will put the oxide wires to practical use. Where thin film is con cerned, when many fabrication methods had been developed using the assistance effect of activated oxygen such as ozone and oxygen radicals, a high current 2 density of 106A/cm at 77K was reported.
Author: Donald M. Ginsberg
Publisher: World Scientific
ISBN: 9789810216375
Category : Technology & Engineering
Languages : en
Pages : 592
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Book Description
This volume contains two chapters of direct interest for applications: The magnetic vortex states and transformations and the effects of c-axis coupling on the transport properties. In addition, the isotope effect is reviewed, since reliable data on ultra-pure samples are now available. The lattice vibrations (phonons) have been explored extensively by inelastic neutron scattering and infrared absorption and these types of data are reviewed as well. The interesting properties of the superconducting doped fullerenes are described; some of their most fundamental properties are shared by the superconducting cuprates. This book with its subject index, like the earlier three volumes in this series, will be found useful both by people entering the field and by workers who are already active in it.
Author: J. Ashkenazi
Publisher: Springer Science & Business Media
ISBN: 1461533384
Category : Science
Languages : en
Pages : 653
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Book Description
This volume contains the proceedings of the University of Miami Workshop on the subject of "Electronic Structure and Mechanisms for High Temperature Super conductivity". The workshop was held at the James L. Knight Physics Building on the campus of the University of Miami, Coral Gables, 3-9 January 1991. Some 106 scientists from 12 countries attended this workshop, most of whom presented either invited or contributed papers. The reader will find in this volume a series of papers discussing the most im portant experimental and theoretical developments as of winter/spring 1990/1991. Despite more than four years of intensive research on high-T materials, there has c been considerable controversy both with respect to the interpretation of experiment and even more so in connection with the construction of an appropriate theory. In this regard, workshops such as this, gathering scientists with many viewpoints, and varying specialization, and fostering constructive discussions, are important in the de velopment of a common ground. Of major concern in the present context were the basic physical processes involved in high-temperature superconductivity.
Author: Nikolay Plakida
Publisher: Springer Science & Business Media
ISBN: 3642126332
Category : Technology & Engineering
Languages : en
Pages : 570
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Book Description
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.
