Relaxation in Complex Systems and Related Topics

1. Front Matter

   Pages i-x

   PDF

2. Relaxation and Dynamics in Magnetic Systems

   1. Front Matter

      Pages 1-1

      PDF

   2. Experiments on Spin Glass Dynamics

      • Leif Lundgren

      Pages 3-10

   3. Attempt at a Comprehensive Description of the Slow Spin Glass Dynamics

      • J. Hammann, M. Ocio, E. Vincent

      Pages 11-21

   4. Spin-Glass Dynamics in the Two-Dimensional Ising System Rb2Cu1-xCoxF4

      • A. F. M. Arts, C. Dekker, H. W. de Wijn

      Pages 23-26

   5. Cluster Model for Non-Equilibrium Relaxation in Spin Glasses

      • Y. Ueno

      Pages 27-30

   6. Some Aspects of the Dynamics of Random Anisotropy Systems

      • B. Barbara, B. Dieny, J. Filippi

      Pages 31-38

   7. Static and Dynamic Properties of Fine Magnetic Particles

      • J. L. Dormann, D. Fiorani

      Pages 39-49

   8. Kinetic Aspects of Magnetic Relaxation in Amorphous Ferromagnetic Alloys

      • P. Allia, F. Vinai

      Pages 51-59

   9. Dynamic Crossover in Dipolar Ferromagnets

      • E. Frey, F. Schwabl

      Pages 61-65

   10. Magnetic Excitations in the Disordered System Mg1-xCoxCl2

       • K. Katsumata, J. Tuchendler

       Pages 67-70

   11. Dynamic Properties of Critical and Paramagnetic Spin Fluctuations in Simple Magnets: Confrontation of Experimental and Theoretical Findings

       • Stephen W. Lovesey, Alessandro Cuccoli, Valerio Tognetti

       Pages 71-78

3. Relaxation and Dynamics in Superconductors

   1. Front Matter

      Pages 79-79

      PDF

   2. Thermally Activated Flux Motion in High-Tc-Superconductors

      • C. W. Hagen, R. Griessen

      Pages 81-88

   3. Flux Motion in Bi2Sr2Ca1Cu2O8+x Single Crystals

      • Dino Fiorani, Alberto M. Testa

      Pages 89-94

   4. Relaxation of the Vortex Lattice in Type-II Superconductors

      • E. H. Brandt

      Pages 95-98

   5. Investigation of the Relaxation Behaviour in High Tc Superconductors

      • Michael Reissner, Robert Ambrosch, Walter Steiner

      Pages 99-104

   6. Relaxation Experiments in Short Coherence Length Superconductors

      • C. Rossel

      Pages 105-112

   7. Quasi-Equilibrium Dynamics and Non-Debye Relaxation in High Tc Granular Superconductors

      • A. Giannelli, C. Giovannella

      Pages 113-122

   8. Relaxation and Dynamics in Granular Superconductors and Superconducting Arrays

      • K. H. Lee, D. Stroud, J. S. Chung

      Pages 123-130

The aim of the workshop was to bring together specialists in various fields where non-exponential relaxation is observed in order to compare models and experimental results and to examine the general physical principles governing this type of behaviour. Non-exponential relaxation is found in extremely diverse physical systems all of which can be classified as complex. The form of the relaxation is generally parametrized using logarithmic, algebraic or stretched exponential decay forms. The conceptually simplest mechanism for the non-exponential decay is a spectrum of relaxation rates due to non-interacting units each of which relaxes with a different intrinsic time constant. Clear experimental examples can be given where for instance the relaxation of a collection of isolated polymer molecules leads to an overall stretched exponential decay. Non-exponential relaxation is observed in all strongly interacting complex systems (structural glasses, spin glasses, etc ... ) where each elementary unit is in interaction with many other units.

• cluster
• complex system
• complex systems
• molecule
• particles
• system

• Université Paris-Sud, Orsay, France

  Ian A. Campbell

• Università di Roma-Tor Vergata, Rome, Italy

  Carlo Giovannella

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