Physics – Condensed Matter – Superconductivity
Scientific paper
2000-02-14
Physics
Condensed Matter
Superconductivity
2 pages + 2 ps figures. Submitted to M2S-HTSC-VI (Houston) Conference
Scientific paper
Four regimes of vortex motion were identified in the magnetoresistance of Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ single crystals: (1) thermally activated flux flow (TAFF) in samples with surface defects caused by thermal annealing; (2) TAFF-like plastic motion of highly entangled vortex liquid at low temperatures, with $U_{pl} \sim (1-T/T_c)/H^{1/2}$; (3) pure free flux flow above the region of (2) in clean and optimally doped samples; or, in its place, (4) a combination of (2) and (3). This analysis gives an overall picture of flux motion in Bi cuprates.
Chen Weimin
Franck J. P.
Jung Jae Joon
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