  This paper is dedicated to the study of interactions between external sources
for the electromagnetic field in a Lorentz symmetry breaking scenario. We focus
on a particular higher derivative, Lorentz violating interaction that arises
from a specific model that was argued to lead to interesting effects in the low
energy phenomenology of light pseudoscalars interacting with photons. The kind
of higher derivative Lorentz violating interaction we discuss do not appear in
the well known Standard Model Extension, therefore they are called nonminimal.
They are usually expected to be relevant only at very high energies, but we
argue they might also induce relevant effects in low energy phenomena. Special
attention is given for phenomena that have no counterpart in Maxwell theory.
