title: Nonlinear electric field effects at a continuous mott-hubbard transition
abstract: We characterize the non-Ohmic portion of the conductivity at temperatures T<1 K in the highly correlated transition metal chalcogenide Ni(S,Se)(2). Pressure tuning of the T = 0 metal-insulator transition reveals the influence of the quantum critical point and permits a direct determination of the dynamical critical exponent z = 2.7(+0.3)(-0.4). Within the framework of finite temperature scaling, we find that the spatial correlation length exponent nu and the conductivity exponent &mgr; differ.
authors.affiliation: Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, England.
authors.initials: A
authors.lastname: Husmann
authors.initials: J
authors.lastname: Brooke
authors.initials: TF
authors.lastname: Rosenbaum
authors.initials: X
authors.lastname: Yao
authors.initials: JM
authors.lastname: Honig