Dynamics of the first-order magnetostructural transition in Gd5(SixGe1-x)4
Departament de Física Fonamental, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Catalonia, Spain
2 Departament d'Estructura i Constituents de la Matèria, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Catalonia, Spain
Revised: 1 June 2004
Published online: 7 September 2004
The dynamics at a mesoscopic scale of the first-order magnetostructural transition in a Gd5(SixGe1-x)4 alloy with x=0.05 is studied. We examine the effect of inducing the transition either by T or H on the entropy change. In addition, we analyse the avalanches between metastable states during the transition. The athermal character of the transition is evidenced. It is also shown that cycling through the transition leads to a reproducible pattern with no characteristic size of the avalanches.
PACS: 75.30.Sg – Magnetocaloric effect, magnetic cooling / 75.30.Kz – Magnetic phase boundaries / 64.70.Kb – Solid-solid transitions
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2004