  We introduce a simple generalization of the basic holographic superconductor
model in which the spontaneous breaking of a global U(1) symmetry occurs via
the Stueckelberg mechanism. This more general setting allows tuning features
such as the order of the transition. The physical vacuum of the condensed phase
and the order of the transition are determined by a detailed analysis of the
free energy of the system. For first order transitions, we identify a
metastable phase above the critical temperature. In this case, the conductivity
shows additional poles, thus suggesting that the condensate has internal
structure. We comment on the possibility of obtaining second order phase
transitions with non mean-field critical exponents.
