We study the non-equilibrium behaviour of three-dimensional spin glasses in the Migdal-Kadanoff approximation. This approximation is exact Tor disordered hierarchical lattices which have a unique ground state and equilibrium properties correctly described by the droplet model. Extensive numerical simulations show that this model lacks ageing in the remanent magnetization as well as a maximum in the magnetic viscosity in disagreement with experiments as well as with numerical studies of the Edwards-Anderson model. This result strongly limits the validity of the droplet model (at least in its simplest form) as a good model for real spin glasses.

Absence of ageing in the remanent magnetization in Migdal-Kadanoff spin glasses / RICCI TERSENGHI, Federico; F., Ritort. - In: JOURNAL OF PHYSICS. A, MATHEMATICAL AND GENERAL. - ISSN 0305-4470. - 33:20(2000), pp. 3727-3734. [10.1088/0305-4470/33/20/301]

Absence of ageing in the remanent magnetization in Migdal-Kadanoff spin glasses

RICCI TERSENGHI, Federico;
2000

Abstract

We study the non-equilibrium behaviour of three-dimensional spin glasses in the Migdal-Kadanoff approximation. This approximation is exact Tor disordered hierarchical lattices which have a unique ground state and equilibrium properties correctly described by the droplet model. Extensive numerical simulations show that this model lacks ageing in the remanent magnetization as well as a maximum in the magnetic viscosity in disagreement with experiments as well as with numerical studies of the Edwards-Anderson model. This result strongly limits the validity of the droplet model (at least in its simplest form) as a good model for real spin glasses.
2000
01 Pubblicazione su rivista::01a Articolo in rivista
Absence of ageing in the remanent magnetization in Migdal-Kadanoff spin glasses / RICCI TERSENGHI, Federico; F., Ritort. - In: JOURNAL OF PHYSICS. A, MATHEMATICAL AND GENERAL. - ISSN 0305-4470. - 33:20(2000), pp. 3727-3734. [10.1088/0305-4470/33/20/301]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/126618
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