Novel Layered Iridate Ba7Ir3O13+{\delta} Thin Films with Colossal Permittivity

Ba7Ir3O13+{\delta} in thin film form is discovered. These films are characterized by colossal permittivity (CP) ~104 at room temperature, attributable to the colossal internal barrier layer capacitance effect at atomically thin domain boundaries. These findings suggest a new route to seeking novel CP materials through designing atomically thin domain boundaries.