  We analyse the superradiant stability of braneworld extremal Kerr and
Kerr-Newman black holes under massive scalar perturbation. These black hole
solutions differ from their four dimensional counterpart by the presence of a
tidal charge, which unlike electric charge, can take both positive and negative
values and carries the signature of extra dimensions. We consider the
perturbation of the brane geometry by a massive scalar field. From the radial
equation of motion of the scalar field, we have found the effective potential
felt by the field. For superradiant stability, there should not be any trapping
well of the effective potential outside of the horizon. Using this condition we
have specified the parameter space of superradiant stability which depends on
parameters of both black hole and perturbation. In the case of Kerr-like
extremal braneworld black holes, we have obtained a bound on tidal charge for
superradiant stability under a massive scalar perturbation. Similarly, for
slowly rotating Kerr-Newman like extremal braneworld black holes, we have
obtained a lower bound of the product of mass to charge ratio of the black hole
and scalar field, for which the system is superradiantly stable.
