  Heterostructure engineering provides an efficient way to obtain several
unconventional phases of LaNiO3, which is otherwise paramagnetic, metallic in
bulk form. In this work, a new class of short periodic superlattices,
consisting of LaNiO3 and EuNiO3 have been grown by pulsed laser interval
deposition to investigate the effect of structural symmetry mismatch on the
electronic and magnetic behaviors. Synchrotron based soft and hard X-ray
resonant scattering experiments have found that these heterostructures undergo
simultaneous electronic and magnetic transitions. Most importantly, LaNiO3
within these artificial structures exhibits a new antiferromagnetic, charge
ordered insulating phase. This work demonstrates that emergent properties can
be obtained by engineering structural symmetry mismatch across a
heterointerface.
