Physics – Condensed Matter – Superconductivity
Scientific paper
2010-03-20
Physics
Condensed Matter
Superconductivity
Listing withdrawn because of multiple submission to arxiv. See arXiv:1004.5309.
Scientific paper
Magneto-optical imaging and Hall-probe array magnetometry are used to measure the field of first flux entry, H_p, into the same Bi_2Sr_2CaCu_2O_8+delta single crystal cut to different crystal thickness-to-width ratios (d/w), and for two angles alpha between the edges and the principal in-plane crystalline (a,b) axes. At all temperatures, the variation with aspect ratio of H_p is qualitatively well described by calculations for the so-called geometric barrier [E.H. Brandt, Phys. Rev. B 60, 11939 (1999)]. However, the magnitude of H_p is strongly enhanced due to the square shape of the crystal. In the intermediate temperature regime (T < ~ 50 K) in which the Bean-Livingston barrier limits vortex entry, there is some evidence for a tiny crystal-orientation dependent enhancement when the sample edges are at an angle of 45\degree with respect to the crystalline axes, rather than parallel to them.
Boehmer A. E.
der Beek Cornelis J. van
Konczykowski Marcin
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