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.

arXiv comment17 pages including 4 figures, accepted for publication in Phys. Rev. B

References in corpus (10)

• Origin of the magnetoelectric coupling effect in Pb(Zr0.2Ti0.8)O3/La0.8Sr0.2MnO3 multiferroic heterostructures
• Spin-controlled Mott-Hubbard bands in LaMnO_3 probed by optical ellipsometry
• Effects of annealing and strain on La_{1-x}Ca_{x}MnO_{3} thin films: a new phase diagram in the ferromagnetic region
• Interplay of p-d and d-d charge transfer transitions in rare-earth perovskite manganites
• Metal-insulator transition in $(LaMn{O}_3{)}_{2n}/(SrMn{O}_3{)}_n$ superlattices
• Evolution of magnetic phases and orbital occupation in (SrMnO3)n/(LaMnO3)2n superlattices
• Effects of oxygen-reducing atmosphere annealing on LaMnO${}_3$ epitaxial thin films
• Dynamical Mean Field Study of Model Double-Exchange Superlattices
• Dimensional crossover of polaron dynamics in Nb:SrTiO3/SrTiO3 superlattices: Possible mechanism of thermopower enhancement
• Polar catastrophe, electron leakage, and magnetic ordering at the LaMnO${}_3$/SrMnO${}_3$ interface

Cited by in corpus (11)

• Preparation of atomically-flat SrTiO3 surfaces using a deionized-water etching and thermal annealing procedure
• Appearance and disappearance of ferromagnetism in ultra-thin LaMnO${}_3$ on SrTiO${}_3$ substrate: a viewpoint from first-principles
• Strongly coupled phase transition in ferroelectric/correlated electron oxide heterostructures
• Correlated Quantum Phenomena of Spin-Orbit Coupled Perovskite Oxide Heterostructures: Cases of SrRuO3 and SrIrO3-Based Artificial Superlattices
• Electronic and Magnetic State of LaMnO${}_3$ Epitaxially Strained on SrTiO${}_3$: Effect of Local Correlation and Non-local Exchange
• Emergence of a ferromagnetic insulating state in LaMnO${}_3$/SrTiO${}_3$ heterostructures: The role of strong electronic correlations and strain
• Magnetic and Orbital Order in ($R$MnO${}_3$)${}_n$/($A$MnO${}_3$)${}_{2n}$ Superlattices Studied via a Double-Exchange Model with Strain
• Spectral weight redistribution in (LaNiO3)n/(LaMnO3)2 superlattices from optical spectroscopy
• Conducting LaAlO3/SrTiO3 heterointerfaces on atomically flat substrates prepared by deionized-water
• 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