Sequence of hole resonances in complex oxide heterostructures

S. Smadici, G. Logvenov, I. Bozovic, P. Abbamonte

Research output: Contribution to journalArticlepeer-review

Abstract

Resonant soft x-ray scattering measurements at the O K edge on Sr2CuO4-ν/La2NiO4+δ (SCO/LNO) complex oxide superlattices show resonances for holes in the two constituent layers, in a sequence of energy levels. The observation of well defined resonances, on a superlattice with layers one unit cell thick, indicates that the resonance energy is largely unaffected by atoms outside a cluster extending half a unit cell along the c axis, consistent with calculations for bulk materials. Comparison to measurements on related superlattices confirms that the order of resonances at the O K edge reflects the order of hole ground-state energies in the heterostructure buried layers. For the SCO/LNO superlattices, the measurements show that the ground-state energies remain different in very thin SCO and LNO layers, which is a contributing factor when considering electronic reconstruction at interfaces, in addition to the areal density of ionic charges in the atomic planes. Different hole energy levels in the SCO/LNO superlattice also imply that holes do not spread into SCO from LNO layers.

Original languageEnglish (US)
Article number155302
JournalJournal of Physics Condensed Matter
Volume26
Issue number15
DOIs
StatePublished - Apr 16 2014

Keywords

  • hole
  • interface
  • resonance
  • x-ray scattering

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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