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|Type:||Artigo de periódico|
|Title:||Frozen magnetization in Bi2Sr2Ca2Cu3O10|
|Abstract:||In this paper we discuss a peculiar low-temperature magnetic relaxation measured in a c-axis oriented bulk Bi2Sr2Ca2Cu3O10 compound sample in magnetic field H = 1 T applied along the c-axis. It is shown that at temperatures T < T-g approximate to 20 K, M(t) relaxation curves are best described by the equation M - M(eq) - M(g) = At--beta, i.e. the irreversible magnetization M(irr) = M - M(eq) consists of a relaxing magnetization M(rel) = At--beta and a ''non-relaxing'' (''glass'') magnetization M(g), while for T > T-g, M(g) is absent. The transition to the ''glassy'' state cannot be understood as a vortex-liquid-vortex-glass transition, It is suggested that the existence of M(g) is associated with a pinning-induced misalignment between ''pancake'' vortices in different superconducting layers.|
|Editor:||Elsevier Science Bv|
|Appears in Collections:||Artigos e Materiais de Revistas Científicas - Unicamp|
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