Physics – Condensed Matter – Superconductivity
Scientific paper
2002-08-13
Phys. Rev. B 68, 184509 (2003)
Physics
Condensed Matter
Superconductivity
9 pages, 13 figures, typo error corrected, last section was refined
Scientific paper
10.1103/PhysRevB.68.184509
Experiments on potential differences in the low-temperature vortex solid phase of monocrystalline platelets of superconducting Bi(2)Sr(2)CaCu(2)O(8) (BSCCO) subjected to currents driven either through an "ab" surface or from one such surface to another show evidence of a resistive/nonresistive front moving progressively out from the current contacts as the current increases. The depth of the resistive region has been measured by a novel in-depth voltage probe contact. The position of the front associated with an injection point appears to depend only on the current magnitude and not on its withdrawal point. It is argued that enhanced nonresistive superconducting anisotropy limits current penetration to less than the London length and results in a flat rectangular resistive region with simultaneous "ab" and "c" current breakdown which moves progressively out from the injection point with increasing current. Measurements in "ab" or "c" configurations are seen to give the same information, involving both ab-plane and c-axis conduction properties.
Kriza Gyorgy
Pallinger A.
Pethes I.
Pomar A.
Portier Fabien
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