Scaling description of non-Ohmic transport in manganites

► Nonlinearity in manganite is probed by varying linear conductance Σ0 by temperature. ► Nonlinearity is described by an onset voltage which scales with Σ0 with an exponent xT. ► xT is different in para- and ferro-magnetic phases and also in different systems. ► Multi-step tunnelling model successfully describes this nonlinear conduction.