Titlebook: Concepts in Electron Correlation; Alex C. Hewson,Veljko Zlatić Book 2003 Springer Science+Business Media Dordrecht 2003 band structure.con

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Competition and Coexistence of Magnetic and Quadrupolar Ordering,ce depends on the strength, and kind, of intersite interactions. This gives rise to complicated phase diagrams, and an enhanced role of frustration and fluctuation effects. The general principles are illustrated on the example of the effect of a magnetic field on quadrupolar phase transitions in the Pr-filled skutterudite PrFe.P..

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Low Dimensional Spin Systems in High Magnetic Fields: Spin-Phonon Interaction, we determined the magnetic excitation spectrum and with ultrasonic measurements we were able to follow these excitations to lowest frequencies. The spin-phonon interaction is of the exchange-striction type and with ultrasonic experiments we are able to determine the strain dependence of the magnetic coupling constant.

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Superconductivity by Kinetic Energy Saving?,c energy, and the correlation energy are discussed for two cases: The BCS scenario and the non-Fermi liquid scenario. A quantitative comparison is made between the BCS-prediction for d-wave pairing in a band with nearest neighbor and next-nearest neighbor hoppping and the experimental specific heat

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Josephson Effect In The Cuprates: Microscopic Implications,.... ~ Δ/. and ../I. ~ ., where .. is the resistance of the junction in the normal state, Δ is the superconducting gap, and . ≪ 1 is the junction transparency. In the cuprates, the experimental value of .... (../..) is much smaller (larger) than the BCS prediction. We argue that both peculiarities o

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Towards Models of Magnetic Interactions in the Cuprates,gen orbitals forming π-bonds with copper are in energetic concurrence to those forming the Zhang-Rice singlet. The corresponding bands display a surprisingly large c-axis dispersion due to hybridization with unoccupied cation .-states in the adjacent layers. Hence, they must have relevance to .-axis

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Spectral Functions and Pseudogap in a Model of Strongly Correlated Electrons,al functions the method of equations of motion is used, where for the self energy the decoupling of spin and single-particle fluctuations is performed. Longer-range spin fluctuations induce a pseudogap showing up at low doping in the effective truncation of the Fermi surface and in reduced electron

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,Exploring the Phase Diagram of the Quasi-2D Organic Superconductors κ -(BEDT-TTF)2X, diagram. Particular attention has been paid to the interrelation of high-temperature anomalies, i.e. a glass transition associated with the ethylene end groups at .. ≃ 50 — 80 . and a density-wave-type transition at T. ≃ 40 ., with the superconducting state.