In-plane anisotropy in BSCCO superconducting tapes: Transport and magnetometric criteria

摘要

Here, the anisotropy between the longitudinal and transverse directions of multi-filamentary Bi2Sr2Ca2Cu3O10+x tapes ("in plane" anisotropy) is studied by transport and magnetization measurements. By minimally manipulating experimental data, we quantify it using one number associated with transport measurements, and two numbers based on magnetization curves. We propose that the simplest and most reliable number is that based on the magnetization loop width. We propose that the best way to evaluate the in-plane anisotropy is to measure the vertical width of the M vs. H loop, where H is applied along two mutually perpendicular directions lying on the wide face of the tape.