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Contenu archivé le 2024-04-16

High-Tc Superconductivity: Concepts, Models and Methods

Objectif

The purpose of the HTSC Theory Action was to bring together a number of theorists working on different aspects of superconductivity in order to:
-Compare results derived from different proposed mechanisms (including the conventional theory of superconductivity) and experimental observations.
-Modify existing theories to account for the different parameter regions observed in high-temperature superconductors, and study the consequences of these modifications for the experiments.
-Construct, out of these results, realistic multibody models of the microscopic interactions present in the superconducting solid materials, and approach them by using the most recently developed numerical methods.
A unified superconductivity theory and an understanding of the basic microscopic physical mechanisms that lead to high temperature superconductivity is sought. The following results will help in the creation of improved superconducting materials:
undoped and weakly doped Mott and Peierls insulator viewpoint (2-dimensional lattice, destruction of long range antiferromagnetic order by doping, spin polarons and spiral phases);
nonmagnetic mechanisms for superconductivity in the strongly doped region (strong coupling theories, polaronic and bipolaronic superconductivity, effects due to reduced dimensionality or more realistic band structures, fluctuations effects on temperature, flux lattices and pinning centres);
magnetic mechanisms for superconductivity in the strongly doped region;
computational approaches (quantum Monte-Carlo simulations and exact diagonalization of small clusters of Hubbard models).
APPROACH AND METHODS
Theorists from diverse fields, ranging from pure solid-state physics to statistical mechanics, and from quantum field theory to numerical modelling, are brought together to work in groups. Periodic mixing of the groups enables the continuous confrontation of the different approaches, techniques and results, and a thorough exchange of information. The Action included meetings of the participant theorists with experimentalists, which is ideal for the comparison of theoretical results and predictions with ex perimental observations, and the foundation of new experiments.
PROGRESS AND RESULTS
The following results have been achieved:
-Undoped and weakly doped Mott and Peierls insulator viewpoint. 2-D Heisenberg lattice, destruction of long range antiferromagnetic order by doping, spin polarons and spiral phases.
-Non-magnetic mechanisms for superconductivity in the strongly doped region. Strong coupling theories, polaronic and bipolaronic superconductivity, effects due to reduced dimensionality or more realistic band structures, fluctuations effects on temperatu re, flux lattices and pinning centres.
-Magnetic mechanisms for superconductivity in the strongly doped region. Short-range magnetic fluctuations, RVB approach, flux phases and anyons.
-Computational approaches. Quantum Monte-Carlo simulations and exact diagonalisation of small clusters of Hubbard models.
POTENTIAL
This Action will lead to a better understanding of the microscopic mechanisms responsible for high-temperature superconductivity. Its success will provide material scientists, physicists and chemists with a novel insight into the structure and behaviour of new superconductors, indispensable for making progress in the production of materials with improved characteristics. The Action will also help in the training of the young scientists taking part in it.

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Coordinateur

Istituto per l'Interscambio Scientifico
Contribution de l’UE
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Adresse
Viale Settimio Severo 65
10133 Torino
Italie

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