Shear-induced vortex decoupling in Bi2Sr2CaCu2O8 crystals
Abstract
Simultaneous transport and magnetization studies in Bi2Sr2CaCu2O8 crystals at elevated currents reveal large discrepancies, including finite resistivity at temperatures of 40 K below the magnetic irreversibility line. This resistivity, measured at the top surface, is nonmonotonic in temperature and extremely nonlinear. The vortex velocity derived from magnetization is six orders of magnitude lower than the velocity derived from simultaneous transport measurements. The findings are ascribed to a shear-induced decoupling, in which the pancake vortices flow only in the top few CuO2 planes, and are decoupled from the pinned vortices in the rest of the crystal.
- Publication:
-
Physical Review B
- Pub Date:
- April 2000
- DOI:
- 10.1103/PhysRevB.61.R9261
- arXiv:
- arXiv:cond-mat/0003143
- Bibcode:
- 2000PhRvB..61.9261K
- Keywords:
-
- 74.72.Bk;
- 74.60.Ge;
- 74.50.+r;
- Y-based cuprates;
- Tunneling phenomena;
- point contacts weak links Josephson effects;
- Condensed Matter - Superconductivity
- E-Print:
- 4 figures. Accepted for publication in Physical review B in the rapid section