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 u formation of superconducting YBa2Cu3O7−x thin films using pure ozone vapor oxidation

Berkley, D. D.; Johnson, B. C.; Anand, N.; Beauchamp, K. M.; Conroy, Lawrence E.; Goldman, A. M.; Mauersberger, K.; Mecartney, Martha L.; Morton, J.; Tuominen, M.; Zhang, Y.-J.

doi:10.1063/1.100489

Cited by 133 publications

(14 citation statements)

References 15 publications

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“…A fresh O 3 sample is prepared before each experiment in a high-vacuum glass line, following the procedure as described in Ref. 25 O in the high vacuum gas line. The contamination is found to increase with time and to be less ∼1 monolayer (ML) at the end of all experiments.…”

Section: Methodsmentioning

confidence: 99%

Water formation by surface O3 hydrogenation

Romanzin

Ioppolo

Cuppen

et al. 2011

The Journal of Chemical Physics

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Three solid state formation routes have been proposed in the past to explain the observed abundance of water in space: the hydrogenation reaction channels of atomic oxygen (O + H), molecular oxygen (O 2 + H), and ozone (O 3 + H). New data are presented here for the third scheme with a focus on the reactions O 3 + H, OH + H and OH + H 2 , which were difficult to quantify in previous studies. A comprehensive set of H/D-atom addition experiments is presented for astronomically relevant temperatures. Starting from the hydrogenation/deuteration of solid O 3 ice, we find experimental evidence for H 2 O/D 2 O (and H 2 O 2 /D 2 O 2 ) ice formation using reflection absorption infrared spectroscopy. The temperature and H/D-atom flux dependence are studied and this provides information on the mobility of ozone within the ice and possible isotope effects in the reaction scheme. The experiments show that the O 3 + H channel takes place through stages that interact with the O and O 2 hydrogenation reaction schemes. It is also found that the reaction OH + H 2 (OH + H), as an intermediate step, plays a prominent (less efficient) role. The main conclusion is that solid O 3 hydrogenation offers a potential reaction channel for the formation of water in space. Moreover, the nondetection of solid ozone in dense molecular clouds is consistent with the astrophysical picture in which O 3 + H is an efficient process under interstellar conditions.

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Section: Methodsmentioning

confidence: 99%

Water formation by surface O3 hydrogenation

Romanzin

Ioppolo

Cuppen

et al. 2011

The Journal of Chemical Physics

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“…This can be done, e.g. by an RF field maintained near the substrates [7) by passing the oxygen through a microwave cavity or by replacing the oxygen by ozone [8]. These examples show that in any case the rate controlled e-gun systems which were often used before for deposition of films like Nb3(GeAl) or other compound systems have to be equipped with additional technical means ifHTSC films shall be prepared in the 2-step process.…”

Section: The 3-step and The 2-step Preparation Proceduresmentioning

confidence: 99%

Epitaxial growth and properties of YBaCuO thin films

Geerk

Linker

Meyer

1989

Materials Science Reports

180

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The growth quality ofYBaCuO thin films deposited by sputtering on different substrates (AlzOs, MgO, SrTiOs, Zr(Y)Oz) has been studied by X-ray diffraction and channeling experiments as a function ofthe deposition temperature. Besides the substrate orientation, the substrate temperature is the parameter determining whether films grow in c-, a-, (110) or mixed directions. Epitaxial growth correlates with high critical current values in the films ofup to 5.5 x 106 AJcm2 at 77 K. Ultrathin films with thicknesses down to 2 nm were grown revealing threedimensional superconducting behaviour. Films on (100) SrTiOs of9 nm thickness and below are partially strained indicating commensurate growth. From the analysis of the surface disorder 1 displaced Ba atom per Baz Y row was obtained indicating that the disordered layer thickness is about 0.6 nm. Tunnel junctions fabricated on these films reveal gap-like structures near ±16m V and ±30m V.Epitaktisches Wachsturn und Eigenschaften dünner Schichten des Hochtemperatur-Supraleiters YBaCuO ZUSAMMENFASSUNG Das Verfahren der Magnetron-Kathodenzerstäubung wurde zur Abscheidung dünner YBaCuO-Schichten auf verschiedenen Substraten (AlzOs, MgO, SrTiOs, Zr(Y)Oz) optimiert. Die Wachstumsrichtung und die kristalline Güte der Schichten wurde in Abhängigkeit von der Substrat-Oberflächengüte, der Orientierung und der Temperatur mittels Ionenchanneling und Röntgendiffraktion untersucht. Der Grad der Epitaxie und die Mosaik-Verbreiterung bestimmen den kritischen Transportstrom mit Werten bis zu 5.5 ·106 Ä/cm2 bei 77 K. Selbst in ultradünnen Schichten mit einer minimalen Dicke von bis zu 2 nm zeigt das supraleitende Verhalten 3-dimensionalen Charakter. Schichten auf (100) SrTiOs mit Dicken kleiner etwa 9 nm sind teilweise zur Unterlage verspannt, was auf kommensurables Wachstum hinweist. Die Channeling-Analyse der Schichtoberfläche ergibt in günstigen Fällen eine Verlagerung von nur 1 Ba-Atom pro Baz YKette, was einer maximalen Dicke der gestörten Oberfläche von etwa 0.6 nm entspricht. Auf diesen Schichten präparierte Tunneldioden zeigen Strukturen mit einer Energielücke inderNähe von ±16m V und ±30m V.--I --

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“…We highlight these details and demonstrate through the verification of Homes scaling[2] that that this approach is nevertheless a powerful alternative to chemical doping for systematically studying the properties of high-temperature superconductors. This is true despite the fact that the doping in this material may not be a purely electrostatic effect.These films were grown by ozone-assisted molecular beam epitaxy [3]. We use Cu and La Knudsen effusion cells to produce stable rates for these two materials.…”

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confidence: 99%

Homes scaling in ionic liquid gatedLa2CuO4+xthin films

2015

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Finding more efficient ways of exploring the doping phase diagrams of high temperature superconductors as well as probing the fundamental properties of these materials are essential ingredients for driving the discovery of new materials. We use a doping technique involving gating with ionic liquids to systematically and continuously tune the Tc of superconducting La2CuO4+x thin films. We probe both the transport properties and the penetration depth of these samples and find that Homes scaling λ −2 ∝ σTc is obeyed, consistent with these materials being in the dirty limit. This result is independent of the precise mechanism for the gating process as all of the parameters of the scaling relationship are determined by direct measurements on the films.

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I n s i t u formation of superconducting YBa2Cu3O7−x thin films using pure ozone vapor oxidation

Cited by 133 publications

References 15 publications

Water formation by surface O3 hydrogenation

Water formation by surface O3 hydrogenation

Epitaxial growth and properties of YBaCuO thin films

Homes scaling in ionic liquid gatedLa2CuO4+xthin films

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