Graded Orbital Occupation Near Interfaces in a La2NiO4-La2CuO4 Superlattice

Smadici, S; Bozovic, I; Lee, J C.T.; Morales, J; Logvenov, G; Pelleg, O; Zhu, Y; Abbamonte, P

doi:10.1103/PhysRevB.84.155411

Title: Graded Orbital Occupation Near Interfaces in a La2NiO4-La2CuO4 Superlattice

Journal Article · Tue Oct 11 00:00:00 EDT 2011 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.84.155411· OSTI ID:1045888

Smadici, S; Bozovic, I; Lee, J C.T.; Morales, J; Logvenov, G; Pelleg, O; Zhu, Y; Abbamonte, P

X-ray absorption spectroscopy and resonant soft x-ray reflectivity show a nonuniform distribution of oxygen holes in a La{sub 2}NiO{sub 4}-La{sub 2}CuO{sub 4} (LNO-LCO) superlattice, with excess holes concentrated in the LNO layers. Weak ferromagnetism with T{sub c} = 160 K suggests a coordinated tilting of NiO{sub 6} octahedra, similar to that of bulk LNO. Ni d{sub 3z{sup 2}-r{sup 2}} orbitals within the LNO layers have a spatially variable occupation. This variation of the Ni valence near LNO-LCO interfaces is observed with resonant soft x-ray reflectivity at the Ni and Cu L edges, at a reflection suppressed by the symmetry of the structure, and is possible through graded doping with holes, due to oxygen interstitials taken up preferentially by inner LNO layers. Since the density of oxygen atoms in the structure can be smoothly varied with standard procedures, this orbital occupation, robust up to at least 280 K, is tunable.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE SC OFFICE OF SCIENCE (SC)

DOE Contract Number:: DE-AC02-98CH10886

OSTI ID:: 1045888

Report Number(s):: BNL-96620-2011-JA; KC0201050; TRN: US1203682

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 84, Issue 15; ISSN 1098-0121

Country of Publication:: United States

Language:: English

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