ANALYSIS OF ANISOTROPIES OF MAGNETIC HYSTERESIS AND MAGNETIC ALIGNMENT IN GRAIN ALIGNED Yb1Ba2Cu3O7-δ

We evaluated the magnetic alignment and superconducting magnetic anisotropies of high-Tc superconductor Yb1Ba2Cu3O7-δ by both X-ray diffraction and magnetization measurements. The sample was grain aligned under a high magnetic field of 6 T. X-ray diffraction pattern revealed normal alignment in Yb-123 by showing the c axis aligned perpendicular to the magnetic field. At low temperatures, magnetic hysteresis ΔM with magnetic field perpendicular to a–b plane is larger than magnetic hysteresis parallel to a–b plane. A crossover was observed at higher temperature in magnetic hystereses, i.e., ΔM⊥a - b < ΔM‖a - b at certain applied field. This crossover can be explained due to difference in vortex structure along both field directions.