Large grain boundary area superconductors G. Hammerl, H. Bielefeldt, S. Leitenmeier, A. Schmehl, C. W. Schneider, A. Weber and J. Mannhart Eur. Phys. J. B, 27 3 (2002) 299-301 Published online: 06 June 2002 DOI: 10.1140/epjb/e2002-00158-1