Effect of the two (100) SrTiO3 substrate terminations on the nucleation and growth of YBa2Cu3O7−δ thin films

Huijbregtse, J.M.; Rector, J.H.; Dam, B.

doi:10.1016/s0921-4534(00)01616-6

Cited by 37 publications

(39 citation statements)

References 46 publications

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“…27 Therefore, we have grown several LCeMO films on (001) STO substrates with different termination (either SrO or TiO 2 ) in order to determine whether the substrate termination influences the microstructure of the films. The SrO terminated sub- strates were obtained by annealing at 950 • C, for 1 h in an oxygen flow, while the TiO 2 -terminated STO substrates were obtained by chemical etching in a BHF solution, following the procedure described in Ref.…”

Section: Structural Analysismentioning

confidence: 99%

Transport, magnetic, and structural properties ofLa0.7Ce0.3MnO3thin films: Evidence for hole-doping

et al. 2009

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Cerium-doped manganite thin films were grown epitaxially by pulsed laser deposition at 720 • C and oxygen pressure pO 2 = 1 − 25 Pa and were subjected to different annealing steps. According to x-ray diffraction (XRD) data, the formation of CeO2 as a secondary phase could be avoided for pO 2 ≥ 8 Pa. However, transmission electron microscopy shows the presence of CeO2 nanoclusters, even in those films which appear to be single phase in XRD. With O2 annealing, the metal-toinsulator transition temperature increases, while the saturation magnetization decreases and stays well below the theoretical value for electron-doped La0.7Ce0.3MnO3 with mixed Mn 3+ /Mn 2+ valences. The same trend is observed with decreasing film thickness from 100 to 20 nm, indicating a higher oxygen content for thinner films. Hall measurements on a film which shows a metal-toinsulator transition clearly reveal holes as dominating charge carriers. Combining data from x-ray photoemission spectroscopy, for determination of the oxygen content, and x-ray absorption spectroscopy (XAS), for determination of the hole concentration and cation valences, we find that with increasing oxygen content the hole concentration increases and Mn valences are shifted from 2+ to 4+. The dominating Mn valences in the films are Mn 3+ and Mn 4+ , and only a small amount of Mn 2+ ions can be observed by XAS. Mn 2+ and Ce 4+ XAS signals obtained in surface-sensitive total electron yield mode are strongly reduced in the bulk-sensitive fluorescence mode, which indicates hole-doping in the bulk for those films which do show a metal-to-insulator transition.

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Section: Structural Analysismentioning

confidence: 99%

Transport, magnetic, and structural properties ofLa0.7Ce0.3MnO3thin films: Evidence for hole-doping

et al. 2009

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“…SrO-terminated SrTiO 3 ͑001͒ can be produced by evaporating Sr metal in a background O 2 atmosphere and further deposition of an SrO monolayer on the substrate. 4,5 Another method is a cleaning of the SrTiO 3 surface in 1-propanol followed by oxygen annealing; 28 further, Schrott et al reported a method to generate the SrO-terminated surface through ashing in O 2 . 6 The behavior of mechanochemically treated surfaces during annealing in an O 2 atmosphere or ultrahigh vacuum ͑UHV͒ is of considerable interest.…”

Section: Introductionmentioning

confidence: 99%

Electronic structure and thermodynamic stability of double-layeredSrTiO3(001)surfaces:Ab initiosimulations

et al. 2007

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Using the B3PW hybrid exchange-correlation functional within density-functional theory and employing Gaussian-type basis sets, we calculated the atomic and electronic structures and thermodynamic stability of three double-layered ͑DL͒ SrTiO 3 ͑001͒ surfaces: ͑i͒ SrO-terminated, ͑ii͒ TiO 2 -terminated, and ͑iii͒ ͑2 ϫ 1͒ reconstruction of TiO 2 -terminated SrTiO 3 ͑001͒ recently suggested by Erdman et al. ͓Nature ͑London͒ 419, 55 ͑2002͔͒. A thermodynamic stability diagram obtained from first-principles calculations shows that regular TiO 2 -and SrO-terminated surfaces are the most stable. The stability regions of ͑2 ϫ 1͒ DL TiO 2 -and DL SrO-terminated surfaces lie beyond the precipitation lines of SrO and TiO 2 compounds and thus are less stable with respect to regular SrTiO 3 ͑001͒ surfaces. Analysis of the stability diagram suggests that Sr precipitation on SrTiO 3 surface never occurs. Our simulations show a substantial increase of Ti-O covalency on the DL surfaces as compared to the regular surfaces, which are themselves more covalent than the crystalline bulk. The implications of our calculated results for recent experimental observations are discussed.

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“…The 100 nm thick Y123 films were grown on TiO 2 (Bsite) terminated SrTiO 3 (STO) substrates, resulting in a CuO chain termination of the Y123 surface 12 . Reflection It is also clear that the film is twinned since the (2×1) spots appear in both directions.…”

mentioning

confidence: 99%

Ortho-II band folding in YBa2Cu3O

et al. 2011

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Effect of the two (100) SrTiO3 substrate terminations on the nucleation and growth of YBa2Cu3O7−δ thin films

Cited by 37 publications

References 46 publications

Transport, magnetic, and structural properties ofLa0.7Ce0.3MnO3thin films: Evidence for hole-doping

Transport, magnetic, and structural properties ofLa0.7Ce0.3MnO3thin films: Evidence for hole-doping

Electronic structure and thermodynamic stability of double-layeredSrTiO3(001)surfaces:Ab initiosimulations

Ortho-II band folding in YBa2Cu3O

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