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000827778 0247_ $$2doi$$a10.1016/j.elspec.2016.04.008
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000827778 1001_ $$0P:(DE-HGF)0$$aEiteneer, D.$$b0
000827778 245__ $$aDepth-Resolved Composition and Electronic Structure of Buried Layers and Interfaces in a LaNiO$_{3}$/SrTiO$_{3}$ Superlattice from Soft- and Hard- X-ray Standing-Wave Angle-Resolved Photoemission
000827778 260__ $$aNew York, NY [u.a.]$$bElsevier$$c2016
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000827778 520__ $$aLaNiO3 (LNO) is an intriguing member of the rare-earth nickelates in exhibiting a metal-insulator transition for a critical film thickness of about 4 unit cells [Son et al., Appl. Phys. Lett. 96, 062114 (2010)]; however, such thin films also show a transition to a metallic state in superlattices with SrTiO3 (STO) [Son et al., Appl. Phys. Lett. 97, 202109 (2010)]. In order to better understand this transition, we have studied a strained LNO/STO superlattice with 10 repeats of [4 unit-cell LNO/3 unit-cell STO] grown on an (LaAlO3)0.3(Sr2AlTaO6)0.7 substrate using soft x-ray standing-wave-excited angle-resolved photoemission (SWARPES), together with soft- and hard- x-ray photoemission measurements of core levels and densities-of-states valence spectra. The experimental results are compared with state-of-the-art density functional theory (DFT) calculations of band structures and densities of states. Using core-level rocking curves and x-ray optical modeling to assess the position of the standing wave, SWARPES measurements are carried out for various incidence angles and used to determine interface-specific changes in momentum-resolved electronic structure. We further show that the momentum-resolved behavior of the Ni 3d eg and t2g states near the Fermi level, as well as those at the bottom of the valence bands, is very similar to recently published SWARPES results for a related La0.7Sr0.3MnO3/SrTiO3 superlattice that was studied using the same technique (Gray et al., Europhysics Letters 104, 17004 (2013)), which further validates this experimental approach and our conclusions. Our conclusions are also supported in several ways by comparison to DFT calculations for the parent materials and the superlattice, including layer-resolved density-of-states results.
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000827778 7001_ $$0P:(DE-HGF)0$$aPálsson, G. K.$$b1$$eCorresponding author
000827778 7001_ $$0P:(DE-Juel1)164137$$aNemšák, S.$$b2
000827778 7001_ $$0P:(DE-HGF)0$$aGray, A. X.$$b3
000827778 7001_ $$0P:(DE-HGF)0$$aKaiser, A. M.$$b4
000827778 7001_ $$0P:(DE-HGF)0$$aSon, J.$$b5
000827778 7001_ $$0P:(DE-HGF)0$$aLeBeau, J.$$b6
000827778 7001_ $$0P:(DE-HGF)0$$aConti, G.$$b7
000827778 7001_ $$0P:(DE-HGF)0$$aGreer, A. A.$$b8
000827778 7001_ $$0P:(DE-HGF)0$$aKeqi, A.$$b9
000827778 7001_ $$0P:(DE-HGF)0$$aRattanachata, A.$$b10
000827778 7001_ $$0P:(DE-HGF)0$$aSaw, A. Y.$$b11
000827778 7001_ $$0P:(DE-HGF)0$$aBostwick, A.$$b12
000827778 7001_ $$0P:(DE-HGF)0$$aRotenberg, E.$$b13
000827778 7001_ $$0P:(DE-HGF)0$$aGullikson, E. M.$$b14
000827778 7001_ $$0P:(DE-HGF)0$$aUeda, S.$$b15
000827778 7001_ $$0P:(DE-HGF)0$$aKobayashi, K.$$b16
000827778 7001_ $$0P:(DE-HGF)0$$aJanotti, A.$$b17
000827778 7001_ $$0P:(DE-HGF)0$$aVan de Walle, C. G.$$b18
000827778 7001_ $$0P:(DE-HGF)0$$aBlanca-Romero, A.$$b19
000827778 7001_ $$0P:(DE-HGF)0$$aPentcheva, R.$$b20
000827778 7001_ $$0P:(DE-Juel1)130948$$aSchneider, C. M.$$b21
000827778 7001_ $$0P:(DE-HGF)0$$aStemmer, S.$$b22
000827778 7001_ $$0P:(DE-HGF)0$$aFadley, C. S.$$b23
000827778 773__ $$0PERI:(DE-600)1491139-5$$a10.1016/j.elspec.2016.04.008$$gVol. 211, p. 70 - 81$$p70 - 81$$tJournal of electron spectroscopy and related phenomena$$v211$$x0368-2048$$y2016
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