Graded orbital occupation near interfaces in a La[subscript 2]NiO[subscript 4]-La[subscript 2]CuO[subscript 4] superlattice

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

doi:10.1103/PhysRevB.84.155411

Graded orbital occupation near interfaces in a La[subscript 2]NiO[subscript 4]-La[subscript 2]CuO[subscript 4] superlattice

Journal Article · Mon Feb 06 04:00:00 EST 2012 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.84.155411· OSTI ID:1029012

Smadici, S; Lee, J C.T.; Morales, J; Logvenov, G; Pelleg, O; Bozovic, I; Zhu, Y; Abbamonte, P ^[1]

UIUC

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.

Research Organization:: Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)

Sponsoring Organization:: DOE - BASIC ENERGY SCIENCES

OSTI ID:: 1029012

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: (15) ; 10, 2011 Vol. 84; ISSN 1098-0121

Country of Publication:: United States

Language:: ENGLISH

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Graded orbital occupation near interfaces in a La[subscript 2]NiO[subscript 4]-La[subscript 2]CuO[subscript 4] superlattice

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