Concepts in Electron Correlation : Proceedings of the NATO Advanced Research Workshop, Hvar, Croatia, September 29-October 3, 2002

The NATO sponsored Advanced Research Workshop on "Concepts in Electron Correlation" took place on the Croatian island of Hvar during the period from the 29th of September to the 3rd of October, 2002. The topic of electron correlation is a fundamental one in the field of condensed matter, and one that is being very actively studied both experimentally and theoretically at the present time. The manifestations of electron cor­ relation are diverse, and play an important role in systems ranging from high temperature superconductors, heavy fermions, manganite compounds with colossal magnetoresistance, transition metal compounds with metal­ insulator transitions, to mesoscopic systems and quantum dots. The aim of the workshop was to provide an opportunity for a dialogue between exper­ imentalists and theoreticians to assess the current state of understanding, and to set an agenda for future work. There was also a follow-up workshop on the same topic where the presentations included more background and introductory material for younger researchers in the field. The papers presented in these proceedings clearly demonstrate the di­ versity of current research on electron correlation. They show that real progress is being made in characterising systems experimentally and in developing theoretical approaches for a quantitative comparison with ex­ periment. The more one learns, however, the more there is to understand, and many of the contributions help to map out the territory which has yet to be explored. We hope that the articles in this volume will be a stimulus for such future work. Front Matter....Pages i-5 Superconductivity by Kinetic Energy Saving?....Pages 7-16 Josephson Effect In The Cuprates: Microscopic Implications....Pages 17-25 Ruthenates: Unconventional Superconductivity and Magnetic Properties....Pages 27-34 Real Structure of Perovskites Looked at From the Band Structure Point of View....Pages 35-43 Towards Models of Magnetic Interactions in the Cuprates....Pages 45-53 C -Axis Intra-Layer Couplings in the CUO 2 Planes of High-T c Cuprates....Pages 55-63 Spectral Functions and Pseudogap in a Model of Strongly Correlated Electrons....Pages 65-73 Mott Insulator to Superconductor VIA Pressure RVB Theory & Prediction of New Systems....Pages 75-84 Exploring the Phase Diagram of the Quasi-2D Organic Superconductors κ -(BEDT-TTF) 2 X....Pages 85-93 Enhancement of Superconductivity by Strong Correlations: A Model Study....Pages 95-113 Inelastic Light Scattering and the Correlated Metal-Insulator Transition....Pages 115-122 Orbital Physics Versus Spin Physics: the Orbital-Hubbard Model....Pages 123-131 Quasiparticles in Photoemission Spectra of Manganites....Pages 133-141 Metals Near a Zero-Temperature Magnetic Instability....Pages 143-153 Heavily Doped Semiconductors: Magnetic Moments, Electron-Electron Interactions and the MetalInsulator Transition....Pages 155-167 Competition and Coexistence of Magnetic and Quadrupolar Ordering....Pages 169-177 Low Dimensional Spin Systems in High Magnetic Fields: Spin-Phonon Interaction....Pages 179-187 ‘Taxonomy’ of Electron Glasses....Pages 189-197 Renormalization Group Approaches for Systems with Electron-Electron and Electron-Phonon Interactions....Pages 199-207 Quantum Phase Transitions in Models of Magnetic Impurities....Pages 209-217 Instability of the Fermi-Liquid Fixed Point in an Extended Kondo Model....Pages 219-227 Projection of the Kondo Effect by Resonant Eigenstates Inside A Circular Quantum Corral....Pages 229-237 Nonequilibrium Electron Transport Through Nanostructures: Correlation Effects....Pages 239-246 Quantum Fluctuations and Electronic Transport Through Strongly Interacting Quantum Dots....Pages 247-256 Properties of Correlated Nanoscopic Systems from the Combined Exact Diagonalization — Ab Initio Method....Pages 257-268 On the Multichannel-Channel Anderson Impurity Model of Uranium Compounds....Pages 269-276 Anomalous Behavior in Rare-Earth and Actinide Systems....Pages 277-286 Describing the Valence-Change Transition by the DMFT Solution of the Falicov-Kimball Model....Pages 287-296 Neutron Spectroscopy of Valence Fluctuation Compounds of Cerium and Ytterbium....Pages 297-305 Generalizations of DMFT, CPA and NCA....Pages 307-315 Itinerant Ferromagnetism for Mixed Valence Systems....Pages 317-326 Transport Properties of Heavy Fermion Systems....Pages 327-334 Transport Properties of Correlated Electrons in High Dimensions....Pages 335-343 From Cein 3 to Pucoga 5 : Trends in Heavy Fermion Superconductivity....Pages 345-351 Do We Understand Electron Correlation Effects in Gadolinium Based Intermetallic Compounds?....Pages 353-361 Optical Properties of Correlated Systems....Pages 363-369 Quasiparticle Undressing: A New Route to Collective Effects in Solids....Pages 371-380 Back Matter....Pages 381-385 The NATO sponsored Advanced Research Workshop on "Concepts in Electron Correlation" took place on the Croatian island of Hvar during the period from the 29th of September to the 3rd of October, 2002. The topic of electron correlation is a fundamental one in the field of condensed matter, and one that is being very actively studied both experimentally and theoretically at the present time. The manifestations of electron corƯ relation are diverse, and play an important role in systems ranging from high temperature superconductors, heavy fermions, manganite compounds with colossal magnetoresistance, transition metal compounds with metalƯ insulator transitions, to mesoscopic systems and quantum dots. The aim of the workshop was to provide an opportunity for a dialogue between experƯ imentalists and theoreticians to assess the current state of understanding, and to set an agenda for future work. There was also a follow-up workshop on the same topic where the presentations included more background and introductory material for younger researchers in the field. The papers presented in these proceedings clearly demonstrate the diƯ versity of current research on electron correlation. They show that real progress is being made in characterising systems experimentally and in developing theoretical approaches for a quantitative comparison with exƯ periment. The more one learns, however, the more there is to understand, and many of the contributions help to map out the territory which has yet to be explored. We hope that the articles in this volume will be a stimulus for such future work The concept of electron correlation is fundamental to condensed matter physics, playing an important role in systems including high temperature superconductors, heavy fermions, manganite compounds with colossal magnetoresistance, transition metal compounds with metal-insulator transitions, and mesoscopic systems like quantum dots and carbon nanotubes. The dialogue between experimentalists and theoreticians presented here is an assessment of our current understanding of the field; one that sets the agenda for future work. When we cool down a superconductor below the critical temperature, the material enters a qualitatively different state of matter, manifested by quantum coherence over macroscopic distances. The dialogue between experimentalists and theoreticians presented in this text present an assessment of our current understanding of the field, one that sets the agenda for future work