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We report a modulation of the in-plane magnetotransport in artificialmanganite superlattice (SL) [(NdMnO3)n /(SrMnO3)n /(LaMnO3)n]m by varying thelayer thickness n while keeping the total thickness of the structure constant.Charge transport in these heterostructures is confined to the interfaces andoccurs via variable range hopping (VRH). Upon increasing n, the interfacialseparation rises, leading to a suppression of the electrostatic screeningbetween carriers of neighboring interfaces and the opening of a Coulomb gap atthe Fermi level (EF). The high-field magnetoresistance (MR) is universallynegative due to progressive spin alignment. However at a critical thickness ofn=5 unit cells (u.c.), an exchange field coupling between ferromagneticallyordered interfaces results in positive MR at low magnetic field (H). Ourresults demonstrate the ability to geometrically tune the electrical transportbetween regimes dominated by either charge or spin correlations.

Geometric tuning of charge and spin correlations in manganite superlattices