Orbital control in strained ultra-thin LaNiO$_3$/LaAlO$_3$ superlattices

Details Orbital control in strained ultra-thin LaNiO$_3$/LaAlO$_3$ superlattices Orbital control in strained ultra-thin LaNiO$_3$/LaAlO$_3$ superlattices

2010-08-09

arxiv.org/abs/1008.1518v2

Europhysics Letters vol. 96 p. 57004 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages. 5 figures

Scientific paper

10.1209/0295-5075/96/57004

In pursuit of rational control of orbital polarization, we present a combined experimental and theoretical study of single unit cell superlattices of the correlated metal LaNiO$_3$ and the band insulator LaAlO$_3$. Polarized x-ray absorption spectra show a distinct asymmetry in the orbital response under strain. A splitting of orbital energies consistent with octahedral distortions is found for the case of compressive strain. In sharp contrast, for tensile strain, no splitting is found although a strong orbital polarization is present. Density functional theory calculations including a Hubbard U term reveal that this asymmetry is a result of the interplay of strain and confinement induces octahedral rotations and distortions and altered covalency in the bonding across the interfacial Ni-O-Al apical oxygen, leading to a charge disporportionation at the Ni sites for tensile strain.

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