Ageing, rejuvenation and memory phenomena in a Bi-2212 superconductor showing the paramagnetic Meissner effect
Department of Materials Science, Uppsala University, Box 534,
751 21 Uppsala, Sweden
Published online: 15 July 2001
A melt-cast Bi2Sr2CaCu2O8 sample showing the paramagnetic Meissner effect (PME) and an ageing phenomenon has been studied by magnetic relaxation and ac-susceptibility experiments. A memory behaviour is observed in the low frequency ac-suscpetibility and in the magnetisation vs. temperature curves measured on heating after certain cooling protocols. It is also found that large enough temperature shifts and positive temperature perturbations cause rejuvenation of the ageing system. All these observations show striking similarities with the ageing behaviour of spin glasses and indicate the existence of a low temperature glassy phase in this PME material.
PACS: 74.25.Ha – Magnetic properties / 74.72.Hs – Bi-based cuprates
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2001