  Local configurational disorder can have a dominating role in the formation of
macroscopic functional responses in strongly correlated materials. Here, we use
entropy-stabilization synthesis to create single crystal epitaxial ABO3
perovskite thin films with equal atomic concentration of 3d transition metal
cations on the B-site sublattice. X-ray diffraction, atomic force microscopy,
and scanning transmission electron microscopy of
La(Cr0.2Mn0.2Fe0.2Co0.2Ni0.2)O3 (L5BO) films demonstrate excellent
crystallinity, smooth film surfaces, and uniform mixing of the 3d transition
metal cations throughout the B-site sublattice. The magnetic properties are
strongly dependent on substrate-induced lattice anisotropy and suggest the
presence of long-range magnetic order in these exceptionally disordered
materials. The ability to populate multiple elements onto a single sublattice
in complex crystal structures opens new possibilities to design functionality
in correlated systems and enable novel fundamental studies seeking to
understand how diverse local bonding environments can work to generate
macroscopic responses, such as those driven by electron-phonon channels and
complex exchange interaction pathways.
