Vortex imaging with varying temperature revealed by SHPM on Bi2Sr2CaCu2O8+y
Date
2008Source Title
Physica C : Superconductivity and its Applications
Print ISSN
0921-4534
Publisher
Elsevier B.V.
Volume
468
Issue
7-10
Pages
832 - 836
Language
English
Type
ArticleItem Usage Stats
137
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Abstract
Scanning Hall probe microscopy with an effective spatial resolution of ∼1 μm has been used to investigate the vortex structures in superconducting Bi2Sr2CaCu2O8+δ single crystals in the temperature range 77.3-81.3 K and zero applied field (in the presence of the earth field). The vortex images were obtained in real time mode as the temperature increased slowly for 3.36 h. At 77.3 K, the vortices were arranged in a chain structure. With the increase of the temperature, two jumps in the vortex array occur at 77.3 K, immediately when the temperature starts to rise, and at 79.2 K with a good stability between jumps. The second jump is accompanied by the jump in the average magnetic induction when bundles of 4-5 additional vortices enter the scanning area and the vortex array get disordered. These directly visualized transitions in the vortex lattice are consistent with a vortex creep over the surface barriers at high temperatures. A short movie is presented. ,
Keywords
Bi-2212Surface barriers
Vortex imaging
Vortex structure
Electromagnetic induction
High temperature effects
Single crystals
Stability
Superconducting devices
Vortex flow
Surface barriers
Vortex imaging
Vortex structure
Semiconducting bismuth compounds
Permalink
http://hdl.handle.net/11693/23158Published Version (Please cite this version)
http://dx.doi.org/10.1016/j.physc.2007.11.059Collections
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