Mechanism of orbital reconstruction at the interfaces of transition metal oxides

Abstract

Orbital reconstruction at interfaces between YBa2Cu3O6 and SrO-terminated SrTiO3 is studied using local spin density approximation (LSDA) with intra-atomic Coulomb repulsion (LSDA+U). The change of population of interfacial Cu 3d orbitals results in stabilization of a new oxidation state $3d^8$ which involves an additional modification of orbital occupancies in the nearest SrO and TiO2 layers. We find that an increase of electron charge in Cu 3d_{x^2-y^2} states counterbalances a depopulation of 3d_{3z^2-r^2} orbitals which induces, on account of the onsite Coulomb repulsion U, a splitting of 3d_{3z^2-r^2} states at CuO2-SrO interfaces.

7 pages, 7 figures, to appear in Physical Review B

References in corpus (3)

• Electric Field Control of the LaAlO${}_3$/SrTiO${}_3$ Interface Ground State
• Covalent bonding and hybridization effects in the corundum-type transition-metal oxides V2O3 and Ti2O3
• Interface hole-doping in cuprate-titanate superlattices

Cited by in corpus (4)

• Oxygen vacancies at titanate interfaces: two-dimensional magnetism and orbital reconstruction
• Superconductor to Mott insulator transition in YBa${}_2$Cu${}_3$O${}_7$/LaCaMnO${}_3$ heterostructures
• Anomalous transport near the Lifshitz transition at the LaAlO${}_3$/SrTiO${}_3$ interface
• Magnetically ordered state at correlated oxide interfaces: the role of random oxygen defects