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Positron Annihilation Studies Of Organic Superconductivity
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Book Synopsis Positron Annihilation Studies of Organic Superconductivity by :
Download or read book Positron Annihilation Studies of Organic Superconductivity written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The positron lifetimes of two organic superconductors, [kappa]-(ET)[sub 2]Cu(NCS)[sub 2] and [kappa]-(ET)[sub 2]Cu[N(CN)[sub 2]]Br, are measured as a function of temperature across [Tc]. A drop of positron lifetime below [Tc] is observed. Positron-electron momentum densities are measured by using 2D-ACAR to search for the Fermi surface in [kappa]-(ET)[sub 2]Cu[N(CN)[sub 2]]Br. Positron density distributions and positron-electron overlaps are calculated by using the orthogonalized linear combination atomic orbital (OLCAO) method to interprete the temperature dependence due to the local charge transfer which is inferred to relate to the superconducting transition. 2D-ACAR results in [kappa]-(ET)[sub 2]Cu[N(CN)[sub 2]]Br are compared with theoretical band calculations based on a first-principles local density approximation. Importance of performing accurate band calculations for the interpretation of positron annihilation data is emphasized.
Book Synopsis Organic Superconductivity Studied by Using Positron Annihilation and Compton Profile Spectroscopies by :
Download or read book Organic Superconductivity Studied by Using Positron Annihilation and Compton Profile Spectroscopies written by and published by . This book was released on 1996 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organic superconductivity was studied by positron annihilation spectroscopy, positron annihilation lifetime (PAL), and two-dimensional angular correlation of annihilation radiation (2D-ACAR). The positron-electron momentum densities of ET-based organic superconductors were measured at room temperature using the 2D-ACAR method. The folded electron densities were found to be in accord with the Fermi surface predicted by a first-principles method using orthogonalized linear combination of atomic orbitals. Positron lifetimes of ET-based organic superconductors were measured as a function of temperature between 1.5K and 300K. A change of electronic density as indicated from the lifetime results was found at the superconducting transition temperature. It was found to be difficult to obtain a good Compton profile at this stage due to the lack of large crystal of organic superconductors. The obtained positron annihilation experimental results, along with theoretical calculations, could be useful in providing clues to search for new organic superconductors in the future.
Book Synopsis Positron Annihilation Studies of Organic Superconductors Kappa-(ET)2Cu[N(CN)2]Br and Kappa-(ET)2Cu(NCS)2 by : Hsiu-Ling Yen
Download or read book Positron Annihilation Studies of Organic Superconductors Kappa-(ET)2Cu[N(CN)2]Br and Kappa-(ET)2Cu(NCS)2 written by Hsiu-Ling Yen and published by . This book was released on 1997 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Positron Annihilation Studies of the Electronic Structure of Selected High-temperature Cuprate and Organic Superconductors by : Lie Ping Chan
Download or read book Positron Annihilation Studies of the Electronic Structure of Selected High-temperature Cuprate and Organic Superconductors written by Lie Ping Chan and published by . This book was released on 1993 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Third International Workshop on Positron and Positronium Chemistry by : Jerry Y. C. Jean
Download or read book Third International Workshop on Positron and Positronium Chemistry written by Jerry Y. C. Jean and published by . This book was released on 1990 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Positron Annihilation Studies of High Temperature Superconductors and Related Compounds by : Simon Rayner
Download or read book Positron Annihilation Studies of High Temperature Superconductors and Related Compounds written by Simon Rayner and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Positron Annihilation Studies of High-temperature Superconductors by : Jeffrey Duane Kyle
Download or read book Positron Annihilation Studies of High-temperature Superconductors written by Jeffrey Duane Kyle and published by . This book was released on 1988 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Positron Annihilation Studies of the Electronic Structure and Fermiology of the High-Tc Superconductors by :
Download or read book Positron Annihilation Studies of the Electronic Structure and Fermiology of the High-Tc Superconductors written by and published by . This book was released on 1992 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Principles and Applications of Positron & Positronium Chemistry by : Y. C. Jean
Download or read book Principles and Applications of Positron & Positronium Chemistry written by Y. C. Jean and published by World Scientific. This book was released on 2003 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive description of the principles and applications of positron and positronium chemistry. Pedagogical and tutorial in nature, it will be ideal for graduate students and researchers in the area of positron annihilation spectroscopy. The contributing authors are authoritative scientists prominent in the frontiers of research, actively pursuing positron annihilation research on chemical and applied systems. Contents: Introduction to Positron and Positronium Chemistry (Y C Jean et al.); Compounds of Positrons and Positronium (D M Schrader); Experimental Techniques in Positron Spectroscopy (P G Coleman); Organic and Inorganic Chemistry of the Positron and Positronium (G Duplotre & I Billard); Physical and Radiation Chemistry of the Positron and Positronium (S V Stepanov & V M Byakov); Positrons and Positronium in the Gas Phase (D M Schrader); Positron Porosimetry (M H Weber & K G Lynn); Positron Annihilation Studies on Superconducting Materials (C S Sundar); Positronium in Si and SiO 2 Thin Films (R Suzuki); Applications to Polymers (P E Mallon); Applications of Slow Positrons to Polymeric Surfaces and Coatings (Y C Jean et al.); Positron Annihilation Induced Auger Spectroscopy (S Amdani et al.); Characterization of Nanoparticle and Nanopore Materials (J Xu); AMOC in Positron and Positronium Chemistry (H Stoll et al.). Readership: Materials science researchers; physical chemists; polymer scientists and engineers; chemical and mechanical engineers; solid state physicists; graduate students in chemistry, physics, engineering and polymer science; coating industry researchers."
Book Synopsis Positron Annihilation Studies of the Electronic Structure and Fermiology of the High-{Tc} Superconductors by :
Download or read book Positron Annihilation Studies of the Electronic Structure and Fermiology of the High-{Tc} Superconductors written by and published by . This book was released on 1992 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: We discuss the application of the positron annihilation angular correlation (ACAR) spectroscopy for investigating the electronic structure and Fermiology of the high-T{sub c} superconductors, with focus on the YBa2Cu3O-- system where most of the experimental and theoretical work has to date been concentrated. Comparisons between measured 2D-ACAR positron spectra and band theory predictions show a remarkable agreement (for the normal state), indicating that the electronic structure and Fermi surface of this material is described reasonably by the conventional picture.
Book Synopsis Progress in Positron Annihilation by : Rados?aw Zaleski
Download or read book Progress in Positron Annihilation written by Rados?aw Zaleski and published by Trans Tech Publications Ltd. This book was released on 2010-12-30 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume is indexed by Thomson Reuters CPCI-S (WoS). The aim of this special collection is to present recent progress made, and reflect current ideas, in research fields where positron and positronium are involved. The contents cover a wide range of positron-related research topics; including both fundamental (theoretical calculations, radiation chemistry, hyperfine interactions, positronium physics and chemistry) and applied (metal, polymer, thin film and other materials, development of experimental techniques) aspects.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Positron Annihilation by : A.T. Steward
Download or read book Positron Annihilation written by A.T. Steward and published by Elsevier. This book was released on 2012-12-02 with total page 455 pages. Available in PDF, EPUB and Kindle. Book excerpt: Positron Annihilation focuses on the process of positron annihilation in different environments. Partitioned into two parts with 42 chapters, the book contains the contributions of authors who have done research on the annihilation of positrons, which brought about valuable information on the properties of matter. The first part of the book deals with lengthy review articles, including a survey of the physics of positron annihilation; positron annihilation in metals and the theory involved in the process; and positron annihilation in alkali halides and ionic crystals. Positronium formation and interaction in gases, molecular substances, and ionic crystals are also given attention. Gaseous positronics and positron annihilation in condensed gases and liquids are also discussed. The second part of the book focuses on developments on positron annihilation and the direction of research on this field. The studies concentrate on positron annihilation in various crystals, metals, mercury, liquefied gases, helium, and metal oxides. Numerical representations and analyses are presented to support the processes involved. The book can best serve the interest of those who want to explore further the annihilation of positrons.
Book Synopsis Positron Annihilation in Chemistry by : Ole E. Mogensen
Download or read book Positron Annihilation in Chemistry written by Ole E. Mogensen and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 279 pages. Available in PDF, EPUB and Kindle. Book excerpt: The only critical discussion available on the chemistry of the two "strange" light particles, the positron and positronium, with much space devoted to the excess electron. Positron annihilation allows the investigation of many unusual phenomena in the reaction kinetics of the positron, positronium, and excess electron, and in radiation chemistry and physics, while also providing important information on defects in solids.
Book Synopsis Positron Annihilation - ICPA-9 by : Zs. Kajcsos
Download or read book Positron Annihilation - ICPA-9 written by Zs. Kajcsos and published by Trans Tech Publications Ltd. This book was released on 1992-01-01 with total page 2146 pages. Available in PDF, EPUB and Kindle. Book excerpt: The volumes present over 400 reviewed papers on the present state of the art and future prospects in the wide field of research involving positrons. The foreword by Edward Teller and the summaries by Jean-Charles Abbe (Chemistry) and Alfred Seeger (Physics) demonstrate how the field is seen from "outside" and from "inside".
Book Synopsis Principles And Applications Of Positron And Positronium Chemistry by : Jerry Y C Jean
Download or read book Principles And Applications Of Positron And Positronium Chemistry written by Jerry Y C Jean and published by World Scientific. This book was released on 2003-04-04 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive description of the principles and applications of positron and positronium chemistry. Pedagogical and tutorial in nature, it will be ideal for graduate students and researchers in the area of positron annihilation spectroscopy. The contributing authors are authoritative scientists prominent in the frontiers of research, actively pursuing positron annihilation research on chemical and applied systems.
Author :Reinhard Krause-Rehberg Publisher :Springer Science & Business Media ISBN 13 :9783540643715 Total Pages :408 pages Book Rating :4.6/5 (437 download)
Book Synopsis Positron Annihilation in Semiconductors by : Reinhard Krause-Rehberg
Download or read book Positron Annihilation in Semiconductors written by Reinhard Krause-Rehberg and published by Springer Science & Business Media. This book was released on 1999 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive book reports on recent investigations of lattice imperfections in semiconductors by means of positron annihilation. It reviews positron techniques, and describes the application of these techniques to various kinds of defects, such as vacancies, impurity vacancy complexes and dislocations.
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