Charge states and magnetic ordering in LaMnO3/SrTiO3 superlattices

Abstract

We investigated the magnetic and optical properties of [(LaMnO3)n/(SrTiO3)8]20 (n = 1, 2, and 8) superlattices grown by pulsed laser deposition. We found a weak ferromagnetic and semiconducting state developed in all superlattices. An analysis of the optical conductivity showed that the LaMnO3 layers in the superlattices were slightly doped. The amount of doping was almost identical regardless of the LaMnO3 layer thickness up to eight unit cells, suggesting that the effect is not limited to the interface. On the other hand, the magnetic ordering became less stable as the LaMnO3 layer thickness decreased, probably due to a dimensional effect.

17 pages including 4 figures, accepted for publication in Phys. Rev. B

References in corpus (2)

• Origin of the magnetoelectric coupling effect in Pb(Zr0.2Ti0.8)O3/La0.8Sr0.2MnO3 multiferroic heterostructures
• Metal-insulator transition in $(LaMn{O}_3{)}_{2n}/(SrMn{O}_3{)}_n$ superlattices

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• Decoupling the effects of geometry and nature of strain in LaMnO${}_3$: Interplay of dynamic correlations and uniaxial strain driving magnetic phase transitions
• Understanding the role of exchange and correlations in complex oxides under strain and oxide heterostructures