Magnetic phase diagram and correlation between metamagnetism and superconductivity in Ru0.9Sr2YCu2.1O7.9 Rashmi Nigam, Shane J. Kennedy, Alexey V. Pan and Shixue Dou Eur. Phys. J. B, 86 6 (2013) 280 Published online: 19 June 2013 DOI: 10.1140/epjb/e2013-40019-2