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

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

2004-04-26

arxiv.org/abs/cond-mat/0404620v1

Phys. Rev. B 69, 132408 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Submitted to PRL 10 May 2003. Submitted to PRB 12 December 2003; published 15 April 2004

Scientific paper

10.1103/PhysRevB.69.132408

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.

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