Field tuning of the electron and hole populations in the ruthenate Wei-Li Lee, M. K. Haas, G. Lawes, A. P. Ramirez, R. J. Cava and N. P. Ong Europhys. Lett., 63 6 (2003) 860-866 Published online: 01 November 2003 DOI: 10.1209/epl/i2003-00599-0