  ATLAS results are presented on a search for flavor-changing neutral currents
(FCNC) in top quark decays at the LHC. Events are searched for where a pair of
top quarks is produced and one decays through the Standard Model $t \rightarrow
Wb$ mode while the other decays through the FCNC mode $t \rightarrow qZ$.
Leptonic final states are used in which both the $W$- and $Z$-bosons decay
leptonically, yielding final states with three leptons and two jets. The
observed events are consistent with the expected backgrounds from Drell-Yan and
diboson production and a limit on the FCNC branching ratio of top quarks to
$qZ$ is set.
