Glauber dynamics in a single-chain magnet: From theory to real systems

The Glauber dynamics is studied in a single-chain magnet. As predicted, a single relaxation mode of the magnetization is found. Above 2.7 K, the thermally activated relaxation time is mainly governed by the effect of magnetic correlations and the energy barrier experienced by each magnetic unit. This result is in perfect agreement with independent thermodynamical measurements. Below 2.7 K, a crossover towards a relaxation regime is observed that is interpreted as the manifestation of finite-size effects. The temperature dependences of the relaxation time and of the magnetic susceptibility reveal the importance of the boundary conditions.Comment: Submitted to PRL 10 May 2003. Submitted to PRB 12 December 2003; published 15 April 200

Néel temperature of a low-dimensional antiferromagnet in a magnetic field

A magnetic field of appropriate magnitude can increase the correlation length of one-dimensional, classical antiferromagnets of the Heisenberg or XY type. It follows that the Néel temperature of quasi-one-dimensional antiferromagnets can be increased by a magnetic field, in agreement with recent experiments on TMMC.Un champ magnétique approprié peut augmenter la longueur de corrélation des chaines antiferromagnétiques classiques de type Heisenberg ou XY. Il en résulte que la température de Néel des antiferromagnétiques presque unidimensionnels peut être augmentée par un champ magnétique, en accord avec des expériences récentes sur TMMC

The PERQ workstation and the distributed computing environment

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Computer simulation calculations for one-dimensional magnetic systems with some remarks on optimisation on the CRAY computer

SIGLELD:8053.4155(RL--82-022). / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Computer simulation calculations for one-dimensional magnetic systems with some remarks on optimisation on the CRAY computer

SIGLELD:8053.4155(RL--82-022). / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Field dependent spin dynamics of antiferromagnetic Heisenberg chains A computer simulation study

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Solitons and the excitation spectrum of the classical Ising-Heisenberg ferromagnetic chain

SIGLELD:8053.415(RL--81-056). / BLDSC - British Library Document Supply CentreGBUnited Kingdo

A coupled mode theory of Heisenberg paramagnets

SIGLEAvailable from British Library Document Supply Centre- DSC:8053.4153(RAL--86-012) / BLDSC - British Library Document Supply CentreGBUnited Kingdo