Thermally assisted flux flow and individual vortex pinning in Bi2Sr2Ca2Cu3O10 single crystals grown by the traveling solvent floating zone technique.

Authors :: Wang, X. L.
Li, A. H.
Yu, S.
Ooi, S.
Hirata, K.
Lin, C. T.
Collings, E. W.
Sumption, M. D.
Bhatia, M.
Ding, S. Y.
Dou, S. X.
Source :: Journal of Applied Physics; 5/15/2005, Vol. 97 Issue 10, p10B114-1-10B114-3, 3p, 5 Graphs
Publication Year :: 2005
Abstract: Magnetoresisitivity and critical current density J<subscript>c</subscript> as a function of temperature and field are studied for Bi<subscript>2</subscript>Sr<subscript>2</subscript>Ca<subscript>2</subscript>Cu<subscript>3</subscript>O<subscript>10</subscript> single crystals grown using the traveling solvent floating zone technique. Below a characteristic field B*, J<subscript>c</subscript> as a function of field exhibits a field-independent plateau associated with thermally activated pinning of individual vortices. Analysis of resistive transition broadening revealed that thermally activated flux flow is found to be responsible for the resistivity contribution in the vicinity of T<subscript>c</subscript>. The activation energy U<subscript>0</subscript> is 800 K in low field, scales as B<superscript>-1/6</superscript> for B<2 T and drops to 200 K with B<superscript>-1/2</superscript> for B>2 T. [ABSTRACT FROM AUTHOR]

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