Download or read book The Hubbard Model written by Dionys Baeriswyl and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the slightly more than thirty years since its formulation, the Hubbard model has become a central component of modern many-body physics. It provides a paradigm for strongly correlated, interacting electronic systems and offers insights not only into the general underlying mathematical structure of many-body systems but also into the experimental behavior of many novel electronic materials. In condensed matter physics, the Hubbard model represents the simplest theoret ical framework for describing interacting electrons in a crystal lattice. Containing only two explicit parameters - the ratio ("Ujt") between the Coulomb repulsion and the kinetic energy of the electrons, and the filling (p) of the available electronic band - and one implicit parameter - the structure of the underlying lattice - it appears nonetheless capable of capturing behavior ranging from metallic to insulating and from magnetism to superconductivity. Introduced originally as a model of magnetism of transition met als, the Hubbard model has seen a spectacular recent renaissance in connection with possible applications to high-Tc superconductivity, for which particular emphasis has been placed on the phase diagram of the two-dimensional variant of the model. In mathematical physics, the Hubbard model has also had an essential role. The solution by Lieb and Wu of the one-dimensional Hubbard model by Bethe Ansatz provided the stimulus for a broad and continuing effort to study "solvable" many-body models. In higher dimensions, there have been important but isolated exact results (e. g. , N agoaka's Theorem).
Download or read book Mechanisms of High Temperature Superconductivity written by Hiroshi Kamimura and published by Springer. This book was released on 2011-12-14 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the discovery by Bednorz and Müller of Cu-O alloys displaying high temperature superconductivity, great energy has been put into research in this field. One of the most important and interesting issues, and the subject of this volume, is the clarification of the microscopic origin and mechanism of high temperature superconductivity. This book discusses the latest experimental results on magnetic, optical, electrical, thermal and mechanical properties of the Cu-O and Bi-O superconductors, as well as proposed theoretical models of the mechanisms. The participants in the symposium agreed that for the high Tc Cu-O superconductors electron correlation effects are of central importance. For the Bi-O superconductors the main topic was whether the mechanism of superconductivity is the same as that of high Tc Cu-O superconductors. What was and what was not resolved at the symposium is summarized at the end of the volume.
Download or read book Uniaxial Pressure Study of Charge Density Waves in a High T Cuprate Superconductor written by Hun-ho Kim and published by Springer Nature. This book was released on 2022-05-07 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents comprehensive studies of charge density waves (CDW) in a high-Tc cuprate superconductor using x-ray scattering techniques under uniaxial pressure. Specifically, the work addresses inelastic x-ray scattering studies under uniaxial pressure performed on the underdoped cuprate YBa2Cu3O6.67(p=0.12, Tc=65K) with incoming photon energy in the resonant (E=931.3 eV, Cu-L3 edge) and non-resonant conditions (E=17.794 keV). This is a completely new approach to the investigation of charge density waves. It revealed new features of charge density waves in cuprates, whose properties had previously been inaccessible..
Download or read book Electron phonon Interaction and Lattice Dynamics in High Tc Superconductors written by Han Zhang and published by . This book was released on 2019 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electron-Lattice Interaction and Its Impact on High Tc Superconductivity / V.Z. Kresin and S.A. Wolf -- Through a Lattice Darkly: Shedding Light on Electron-Phonon Coupling in the High Tc Cuprates / D.R.Garcia and A. Lanzara -- Electron-Phonon Coupling Effects Explored by Inelastic Neutron Scattering / L. Pintschovius -- Phonon Nomalies and Dynamic Stripes / D. Reznik -- Oxygen Isotope Effect in Cuprates Results from Polaron-induced Superconductivity / S. Weyeneth and K.A. Müller -- Oxygen Isotope Effect on the Effective Mass of Carriers from Magnetic Measurements on La2-xSrxCuO4 / G.M. Zhao, K.K. Singh, A.P.B. Sinha, and D.E. Morris -- Isotope Effects and Possible Pairing Mechanism in Optimally Doped Cuprate Superconductors / G.M. Zhao, V. Kirtikar, and D.E. Morris -- Isotopic Fingerprint of Electron-Phonon Coupling in High-Tc Cuprates / H. Iwasawa, J.F. Douglas, K. Sato, T. Masui, Y. Yoshida, Z. Sun, H. Eisaki, H. Bando, A. Ino, M. Arita, K. Shimada, H. Namatame, M. Taniguchi, S. Tajima, S. Uchida, T. Saitoh, D.S. Dessau, and Y. Aiura -- Kink Structure in the Electronic Dispersion of High-Tc Superconductors From the Electron-Phonon Interaction / S. Koikegami and Y. Aiura -- Theory of High-Temperature Superconductivity in Doped Polar Insulators / A.S. Alexandrov -- High-Temperature Superconductivity: The Explanation / A.S. Alexandrov -- Polaronic Effect and Its Impact on Tc for Novel Layered Superconducting Systems / V. Z. Kresin -- Fine Structure in the Tunneling Spectra of Electron-Doped Cuprates: No Coupling to the Magnetic Resonance Mode / G.M. Zhao -- Identification of the Bulk Pairing Symmetry in High-Temperature Superconductors: Evidence for an Extended S Wave with Eight Line Nodes / G.M. Zhao -- Block Model and Origin of Strong Anisotropy in High Tc Superconductors / H. Zhang.
Download or read book On the Nature of Charge Density Waves Superconductivity and Their Interplay in 1T TiSe2 written by Chuan Chen and published by . This book was released on 2019 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents analytical theoretical studies on the interplay between charge density waves (CDW) and superconductivity (SC) in the actively studied transition-metal dichalcogenide 1T-TiSe2. It begins by reapproaching a years-long debate over the nature of the phase transition to the commensurate CDW (CCDW) state and the role played by the intrinsic tendency towards excitonic condensation in this system. A Ginzburg-Landau phenomenological theory was subsequently developed to understand the experimentally observed transition from commensurate to incommensurate CDW (ICDW) order with doping or pressure, and the emergence of a superconducting dome that coexists with ICDW. Finally, to characterize microscopically the effects of the interplay between CDW and SC, the spectrum of CDW fluctuations beyond mean-field was studied in detail. In the aggregate, the work reported here provides an encompassing understanding of what are possibly key microscopic underpinnings of the CDW and SC physics in TiSe2.
