Scanning Auger microscopy analysis of 90 K Y–Ba–Cu–O superconductors

Cota, L.; Garza, L. Morales de la; Hirata, G.A.; Martı́nez, L.; Orozco, E.; Carrillo, E.; Mendoza, Asunción Mendoza; Albarrán, J.L.; Fuentes-Maya, J.; Boldú, J. L.; Pérez-Ramírez, J.G.; Pérez, R.; Gasga, José Reyes; Авалос, M.; José‐Yacamán, M.

doi:10.1557/jmr.1988.0417

Cited by 6 publications

(2 citation statements)

References 8 publications

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“…(iii) Not all YBCO grains are of the same type. Auger scanning microscopy experiments (Cota et al 1988) show that two phases are present. One is the standard compositional phase (this shows a platelet shape) and the second phase (which has a granular appearance) is Ba enriched.…”

Section: Free Swfacesmentioning

confidence: 97%

Defect phenomena in superconducting oxides and analogous ceramic oxides

Stoneham¹,

Smith²

1991

J. Phys.: Condens. Matter

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I n this review we discussdefect phenomena in superconductingoxides. We survey those aspects oi oxide superconductors which relate them most closely to conventional ceramicoxides, concentratingon processesand behaviourrelatedtodefects. We alsoidentiiy areas of difference between two types of oxide.Theoretical modelling of conventional oxides has been extremely effective. and we emphasize that some of these modelling tools can be exploited for the superconducting oxides too, In particular, we stress those methods and ideas that provide a framework for understanding behaviour, those that provide a database of good quantitative experiments and those that provide an established and tested approach to quantitative modelling as a guide to prediction. optimiration and extrapolation.Much progress has been made in both theory and experiment, but some problems do remain and these have not been omitted from our discussions. There is potential to exploit past work on defects in oxides, so as to control defect processes and microstructure and hence to enhance performance.

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Section: Free Swfacesmentioning

confidence: 97%

Defect phenomena in superconducting oxides and analogous ceramic oxides

Stoneham¹,

Smith²

1991

J. Phys.: Condens. Matter

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“…Other workers also report a deviation of the relative ratio between metallic elements from the optimal 1:2:3 ratio using AES. 8 ' 9 In order to obtain the 1:2:3 ratio, the sensitivity factor of Cu must be reduced from 0.2 (the sensitivity factor of pure Cu) to about 0.05. This implies that the Auger yield of Cu in 1-2-3 differs markedly from that of pure Cu metal.…”

Section: Discussionmentioning

confidence: 99%

Near-surface stoichiometry of high temperature superconducting YBaCuO thin films

et al. 1990

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The surface morphology and near-surface chemical composition of high temperature superconducting Y-Ba-Cu-O thin films have been studied by Scanning Electron Microscopy (SEM) and Auger Electron Spectroscopy (AES) depth profiling. These films were fabricated on SrTiO 3 substrates by RF diode sputter deposition and subsequent furnace annealing in oxygen. The chemical composition at and near the surface of thin films was found to differ from the bulk composition. At about 500 A below the surface the Y, Ba, and Cu stoichiometry, as determined by AES, gradually approach that of the film interior. These results suggest that, for furnace annealed films, there may exist a minimum deposited Y-Ba-Cu-O film thickness in which superconductivity is possible. It was also found that the calculated copper concentration determined by AES during depth profiling is significantly lower than its actual value.

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Spectroscopic properties

Poole

2014

Superconductivity

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Scanning Auger microscopy analysis of 90 K Y–Ba–Cu–O superconductors

Cited by 6 publications

References 8 publications

Defect phenomena in superconducting oxides and analogous ceramic oxides

Defect phenomena in superconducting oxides and analogous ceramic oxides

Near-surface stoichiometry of high temperature superconducting YBaCuO thin films

Spectroscopic properties

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