Graded orbital occupation near interfaces in a La2NiO4 – La2CuO4 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

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:1958852

Smadici, S. ^[1]; Lee, J. C. T. ^[1]; Morales, J. ^[1]; Logvenov, G. ^[2]; Pelleg, O. ^[3]; Bozovic, I. ^[3]; Zhu, Y. ^[3]; Abbamonte, P. ^[1]

Univ. of Illinois at Urbana-Champaign, IL (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States); Max Planck Institute of Solid State Research, Stuttgart (Germany)
Brookhaven National Lab. (BNL), Upton, NY (United States)

X-ray absorption spectroscopy and resonant soft x-ray reflectivity show a nonuniform distribution of oxygen holes in a La₂NiO₄–La₂CuO₄ (LNO-LCO) superlattice, with excess holes concentrated in the LNO layers. Weak ferromagnetism with T_c=160 K suggests a coordinated tilting of NiO₆ octahedra, similar to that of bulk LNO. Ni d_3z²–r² 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. Further, 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:: Univ. of Illinois at Urbana-Champaign, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-06ER46285; AC02-98CH10886; FG02-07ER46453; FG02-07ER46471; AC02-06CH11357

OSTI ID:: 1958852

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

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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Title: Graded orbital occupation near interfaces in a La₂NiO₄ – La₂CuO₄ superlattice