The grain-alignment and its effect on the levitation force of melt processed YBCO single-domained bulk superconductors

W. M. Yang, L. Zhou, Y. Feng, P. X. Zhang, Shaokai Chen, M. Z. Wu, C. P. Zhang, J. R. Wang, Z. H. Du, F. Y. Wang, Z. M. Yu, X. Z. Wu, W. Gawalek, P. Gornert