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The programs of the Lorentz center are supported financially by NWO and FOM



The programs of the Lorentz center are supported financially by NWO and FOM.

Additional funding for this workshop from the Lorentz Fund is gratefully acknowledged


Aim and description of the workshop


"Strongly Correlated Electron Systems''



Organizers: Sasha Balatsky, Los Alamos, NM, USA

Jan Zaanen, Leiden University, Netherlands


The aim of this workshop is to bring together a relatively small group of theorists and experimentalists  to work in an informal setting at the frontier of the physics of strongly correlated electron systems.


This field of science is at present in a rapid flux and our explicit goal is to bring together the developments in the various subareas of this general field. Cuprate high Tc superconductivity will play a central role, given the revolutionary developments taking place at the moment both with regard to the evidences for meso-scale self-organizations (stripes), as with regard to the physics of the superconducting state itself (nodal fermions, resonance peak, etcetera).


A next subject is the colossal magneto-resistance manganites, with its astonishing variety of electronic ordering phenomena, while on the most basic level the questions are quite similar as in the context of the cuprates. Is the low  temperature metallic state of the manganites a band-structure affair, or do the intricate meso-scale correlations, seen at high temperature,  persist in some quantum-mechanical form?


Relative newcomers are the ruthenates, where it  now seems established that p-wave or f-wave  superconductors are realized. Is it so that this superconductivity is driven by spin-fluctuations while the normal state is a Fermi-liquid, or are there stronger similarities with the mysterious physics of cuprates?


The recent experiments by Batlogg and coworkers involving C60 and pentacene have revived the interest in the organic metals and superconductors, suggesting that the established views on the nature of these electron systems might well be flawed.

The superconducting Tc's are too high to be explained with BCS while also doping dependences etcetera do not make sense when viewed from a conventional perspective.

These findings give new impetus to the idea that  the superconductivity has to do with that of the cuprates.


The latest addition to this list might be MgB2, which was very recently found to be  also a high Tc superconductor with its 39 K transition temperature. Does this material share other characteristics  with the  established unconventional superconductors?

We hope that when the workshop takes place, enough information is available to answer  this question.


Alltogether, there are reasons to believe that the unconventional and mysterious electronic properties in all these systems are related to a common denominator, to yet to be discovered new principles active in these strongly interacting quantum systems.


This workshop is intended to be a forum for that part of the community which is sharing this hypothesis.