Nonlinear conductivity in CaRuO3 thin films measured by short current pulses Sven Esser, Sebastian Esser, Christian Stingl and Philipp Gegenwart Eur. Phys. J. B, 87 6 (2014) 133 Published online: 18 June 2014 DOI: 10.1140/epjb/e2014-50215-1