  The influence of high electric fields on the charge stripe order in
Nd1.67Sr0.33NiO4 was studied by means of simultaneous hard x-ray diffraction
and electrical transport experiments. Direct measurements of the charge stripe
satellite peaks in zero and high electric fields provide no evidence for a
deformation or a sliding of the stripe lattice, which contradicts previous
indications from non-linear conductance effects. By using the order parameter
of a structural phase transition for instant sample temperature measurements,
non-linear transport effects can be attributed to resistive heating.
Implications for the pinning of stripes in the nickelates are discussed.
