Large grain boundary area superconductors
  For many applications of polycrystalline high-Tc superconductors the small critical currents of the grain boundaries pose a severe problem. To solve this problem we derive novel designs for the microstructure of coated conductors. 
G. Hammerl, H. Bielefeldt, S. Leitenmeier, A. Schmehl, C.W. Schneider,   A. Weber, J. Mannhart