Abstract

Pre-contacted, small mesas can be etched into a single crystal of Bi-2212 high- T c superconductor to study tunneling between superconducting planes in the c-axis direction, in so called intrinsic Josephson junctions. These can be applied, for example, to study current transport in the c-axis direction under magnetic fields in order to map vortex phase transitions and the irreversibility line, vortex pinning by columnar defects from heavy ion irradiation, or the effects on the pseudogap and the superconducting ininteraction by changing the separations of the copper oxygen planes by intercalation or pressure.

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