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|Type:||Artigo de periódico|
|Title:||Staircase-type magnetic-field dependence of the activation energy of Josephson interlayer vortices in Bi2Sr2CaCu2O8|
da Silva, RR
|Abstract:||The anomalous depinning of Josephson interlayer vortices in Bi2Sr2CaCu2O8 high-T-c superconductor occurring at nearly field-independent temperature T-x=20-40 K has been studied by means of ac susceptibility measurements with magnetic field applied parallel to CuO2 planes. From the frequency dependence T-x(v(m)) we define the flux-creep activation energy for Josephson vortices U-JV(H) which increases with field and shows well-defined plateaus. In contrast, the activation energy of in-plane pancake vortices U-PV(H) decreases with field, i.e., demonstrates a qualitatively different behavior.|
|Editor:||American Physical Soc|
|Appears in Collections:||Artigos e Materiais de Revistas Científicas - Unicamp|
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