Download or read book Effects of the Electron phonon Interaction in Hexagonal Close packed Metals written by Paul Thomas Truant and published by . This book was released on 1972 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Electron Phonon Interaction in Metals written by Xiaodong Yang and published by . This book was released on 2010 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phonons and electrons are two types of excitations which are responsible for many properties of condensed matter materials. The interaction between them plays an important role in condensed matter physics. In this thesis we present some theoretical investigations of the effects due to the interactions between phonons and electrons interactions. We show evidence that a structural martensitic transition is related to significant changes in the electronic structure, as revealed in thermodynamic measurements made in high magnetic fields. The effect of the magnetic field is considered unusual, as many influential investigations of martensitic transitions have emphasized that the structural transitions are primarily lattice dynamical and are driven by the entropy due to the phonons. We provide a theoretical frame-work which can be used to describe the effect of a magnetic field on the lattice dynamics in which the field dependence originates from the dielectric constant. The temperature-dependence of the phonon spectrum of alpha-uranium has recently been measured by Manley et al. using inelastic neutron scattering and x-ray scattering techniques. Although there is scant evidence of anharmonic interactions, the phonons were reported to show some softening of the optic modes at the zone boundary. The same group of authors later reported that an extra vibrational mode was observed to form at a temperature above 450 K. The existence of the proposed new mode is inconsistent with the usual theory of harmonic phonons, as applied to a structure composed of a monoclinic Bravais lattice with a two-atom basis. We investigate the effect that the f electron-phonon interaction has on the phonon spectrum and its role on the possible formation of a breathing mode of mixed electronic and phonon character. We examine the model by using Green's function techniques to obtain the phonon spectral density. Some materials undergo phase transitions from a high temperature state with periodic translational invariance to a state in which the electronic charge density is modulated periodically. The wave vector of the modulation may be either commensurate or incommensurate with the reciprocal lattice vectors of the high temperature structure. In the case of an incommensurate charge density wave, the system supports phason excitation. For an incommensurate state, the new ground state has a lower symmetry than the high temperature state since the charge density does not have long-ranged periodic translational order. If the metal is ideal (with no impurities), a charge density wave should be able to slide throughout the crystal without resistance, resulting in current flow similar to that of a superconductor. The phason is an excitation of the charge density wave which is related to the collective motion of electrons. We estimate the phason density of states, and the phason contribution to the specific heat. Angle-resolved photoemission experiments have been performed on USb2, and very narrow quasiparticle peaks have been observed in a band which local spin-density approximation (LSDA) predicts to osculate the Fermi energy. The observed band is found to be depressed by 17 meV below the Fermi energy. The experimentally observed quasiparticle dispersion relation for this band exhibits a kink at an energy of about 23 meV below the Fermi energy. The kink is not found in LSDA calculations and, therefore, is attributable to a change in the quasiparticle mass renormalization by a factor of approximately 2. The existence of a kink in the quasiparticle dispersion relation of a band which does not cross the Fermi energy is unprecedented. The kink in the quasiparticle dispersion relation is attributed to the effect of the interband self-energy involving transitions from the osculating band into a band that does cross the Fermi energy.
Download or read book The Electron phonon Interaction in Metals written by Göran Grimvall and published by North Holland. This book was released on 1981 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Electron phonon Interaction on Electronic Specific Heat of Simple Metals written by Neil W. Ashcroft and published by . This book was released on 1964 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: The quantitative importance (almost dominance) of the electron-phonon interaction in the deviation of the electronic specific heat from the free electron value in simple metals is reported. Only the metals Na, Al and Pb were considered since for them (i) The band structure and the Fermi surfaces are relatively well known and (ii) The phonon dispersion curves have been measured. With this knowledge the calculations are performed with no adjustable parameters.
Download or read book Introduction to the Electron Theory of Metals written by Uichiro Mizutani and published by Cambridge University Press. This book was released on 2001-06-14 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electron theory of metals textbook for advanced undergraduate students of condensed-matter physics and related disciplines.
Download or read book Electron Phonon Interactions A Novel Semiclassified Approach written by Albert Rose and published by World Scientific. This book was released on 1989-04-01 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph is a radical departure from the conventional quantum mechanical approach to electron-phonon interactions. It translates the customary quantum mechanical analysis of the electron-phonon interactions carried out in Fourier space into a predominantly classical analysis carried out in real space. Various electron-phonon interactions such as the polar and nonpolar optical phonons, acoustic phonons that interact via deformation potential and via the piezoelectric effect and phonons in metals, are treated in this monograph by a single, relatively simple “classical” model. This model is shown to apply to electron interactions with the deep lying X-ray levels of atoms, with plasmons and with Cerenkov radiation. The unifying concept that applies to all of these phenomena is a new definition of a coupling constant. The essentially classical interaction of an electron with its surrounding is clearly brought out to be the cause of spontaneous emission of phonons. The same concept also applies to the case of spontaneous emission of photons. While the bulk of this monograph deals with quanta of phonons and quanta of photons, a discussion of the acousto electric effect which is a purely classical phenomenon is presented. The newly defined coupling constant turns out to be valid too for this discussion. This universality of the coupling constant goes far beyond. It is equally applicable to amorphous materials. This significant application gives an analytic formulation of mobility in amorphous materials.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1972 with total page 946 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Electronic Structure and Properties written by Frank Y. Fradin and published by Elsevier. This book was released on 2013-10-22 with total page 461 pages. Available in PDF, EPUB and Kindle. Book excerpt: Treatise on Materials Science and Technology, Volume 21: Electronic Structure and Properties covers the developments in electron theory and electron spectroscopies. The book discusses the electronic structure of perfect and defective solids; the photoelectron spectroscopy as an electronic structure probe; and the electron-phonon interaction. The text describes the elastic properties of transition metals; the electrical resistivity of metals; as well as the electronic structure of point defects in metals. Metallurgists, materials scientists, materials engineers, and students involved in the related fields will find the book useful.
Download or read book Publications written by United States. National Bureau of Standards and published by . This book was released on 1978 with total page 804 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1975 with total page 1090 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Biweekly Cryogenics Current Awareness Service written by and published by . This book was released on 1979 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Springer Handbook of Surface Science written by Mario Rocca and published by Springer Nature. This book was released on 2021-01-14 with total page 1273 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook delivers an up-to-date, comprehensive and authoritative coverage of the broad field of surface science, encompassing a range of important materials such metals, semiconductors, insulators, ultrathin films and supported nanoobjects. Over 100 experts from all branches of experiment and theory review in 39 chapters all major aspects of solid-state surfaces, from basic principles to applications, including the latest, ground-breaking research results. Beginning with the fundamental background of kinetics and thermodynamics at surfaces, the handbook leads the reader through the basics of crystallographic structures and electronic properties, to the advanced topics at the forefront of current research. These include but are not limited to novel applications in nanoelectronics, nanomechanical devices, plasmonics, carbon films, catalysis, and biology. The handbook is an ideal reference guide and instructional aid for a wide range of physicists, chemists, materials scientists and engineers active throughout academic and industrial research.
Download or read book Solid State Physics written by and published by Academic Press. This book was released on 2014-05-14 with total page 551 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solid State Physics
Download or read book 1955 1999 Overview Contents and Authors written by and published by Academic Press. This book was released on 1999-09-01 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: The explosion of the science of mesoscopic structures is having a great impact on physics and electrical engineering because of the possible applications of these structures in microelectronic and optoelectronic devices of the future.
Download or read book Condensed Matter in a Nutshell written by Gerald D. Mahan and published by Princeton University Press. This book was released on 2011 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt: An introduction to the area of condensed matter in a nutshell. This textbook covers the standard topics, including crystal structures, energy bands, phonons, optical properties, ferroelectricity, superconductivity, and magnetism.
Download or read book Metals Abstracts written by and published by . This book was released on 1989 with total page 1558 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scattering of Thermal Neutrons written by Andre Larose and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solid state physicists have long appreciated the usefulness of thermal neutron scattering in the inves tigation of condensed matter. This technique was first made possible by the advent of the nuclear reac tor and has, since then, undergone many refinements. The developments in this field of research have, we felt, necessitated the making of a comprehensive compilation of the published thermal neutron papers. The large number of titles collected in this book, as well as their diversity and their yearly distribution, reflects the continued contribution of the neutron probe to our understanding of physical systems. This bibliography is an updated and improved version of the one first published by us in March of 1973 under a similar title. Many of the omissions and inconsistencies of the first edition, such as occurred, for example, in the initialing of authors' names, have been corrected. The literature search has been carried back to 1932, the year when the existence of the neutron was experimentally confirmed. Several additional journals have also been searched and brought up to date together with those listed in our first publication. The number of entries is now 8543, an increase of 65 per cent relative to the first edition.
