Local electrodynamics in heavy ion irradiated Bi₂Sr₂CaCu₂O_8δ

Transport measurements in the flux transformer and c-axis geometries are used to investigate vortex dynamics in heavy ion irradiated BSCCO crystals. In the flux transformer geometry there is a range of fields, temperatures, and angles where the primary and secondary voltages show close correspondence, as observed in YBCO. This occurs because the columnar defects suppress thermal fluctuations and decrease_ρc. Values for_ρaband_ρcare extracted from the flux transformer data assuming local anisotropic electrodynamics and compared with directly measured c-axis data. Good agreement confirms the validity of local resistivity. This is supported by both measurement configurations indicating that_ρcvanishes faster than_ρab.