Control of growth direction of epitaxial YBaCuO thin films on SrTiO3-substrates

Linker, G.; Xi, X. X.; Meyer, O.; Li, Qi; Geerk, J.

doi:10.1016/0038-1098(89)90844-2

Cited by 108 publications

(13 citation statements)

References 6 publications

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“…On (100)-oriented substrates the films in the whole temperature range grow highly textured with a general trend that at higher temperatures the c-axis was aligned perpendicular to the substrate surface while at lower temperatures the c-axis was in the film plane and the a-axis perpendicular to the substrate. Between the two extreme cases mixtures ofboth orientations were observed [20].…”

Section: 1mentioning

confidence: 99%

Epitaxial growth and properties of YBaCuO thin films

Geerk

Linker

Meyer

1989

Materials Science Reports

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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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Section: 1mentioning

confidence: 99%

Epitaxial growth and properties of YBaCuO thin films

Geerk

Linker

Meyer

1989

Materials Science Reports

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180

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“…The latter can be achieved by a preparation process according to a previously developed template technique. 34,35 First, a (110) oriented layer of non-superconducting PrBa 2 Cu 3 O 7-d (PBCO) with a thickness of 50 nm was deposited by PLD on SrTiO 3 (STO) single crystals with (110) orientation at T ¼ 650 C and an oxygen pressure of 40 Pa. This PBCO buffer layer stabilizes the (110) orientation of YBCO layers grown subsequently in the YBCO/LCMO/YBCO trilayer.…”

Section: Methodsmentioning

confidence: 99%

Preparation of a ferromagnetic barrier in YBa2Cu3O7–δ thinner than the coherence length

Soltan

Albrecht

Goering

et al. 2015

Journal of Applied Physics

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Thin ferromagnetic La2∕3Ca1∕3MnO3 layers are deposited in between two layers of the high-Tc superconductor YBa2Cu3O7–δ (YBCO) by pulsed laser deposition. Using a tailored buffer layer allows the change of the orientation of the CuO2 planes inside the superconducting layers. With this technique it is possible to produce ferromagnetic barrier layers with high ferromagnetic transition temperatures that are thinner than the coherence length of the adjacent superconductors. Magnetization and electric transport measurements suggest that this geometry might be successful for the generation of ferromagnetic Josephson junctions in high temperature superconducting YBCO.

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“…Devices (100) and (110) oriented films. In the late 80's several authors described the deposition of (110)-oriented YBCO thin films grown on (110) SrTiO 3 substrates [76,77]. Care must be taken that a dedicated film analysis is capable to distinguish between the (110) orientation and the competing (103) / (103) orientation with identical peak positions in the x-ray Θ-2Θ diffraction patterns.…”

Section: Tailoring Cuprate Thin Film Orientationmentioning

confidence: 99%

Science and technology of cuprate-based high temperature superconductor thin films, heterostructures and superlattices—the first 30 years (Review Article)

Habermeier

2016

Low Temperature Physics

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Science and technology of cuprate-based high temperature superconductor thin films, heterostructures and superlattices -the first 30 years (Review Article) H.-U. Habermeier Science Consulting International, Niersteinerstr, 28, Stuttgart D 70499, Germany Max-Planck-Institute for Solid State Research, Heisenbergstr, 1, Stuttgart D 70569, Germany E-mail: huh@fkf.mpg.de Received May 30, 2016, published online August 25, 2016 During the three decades after the discovery of superconductivity at high temperatures in copper oxides, intense research activities generated a tremendous progress in both, mastering the scientific challenges underpinning the understanding of the properties of these chemically and structurally complex materials as well as achieving a mature technology in preparing single phase bulk specimens -including single crystals -and epitaxially grown single crystalline thin films. This review covers in addition to more basic physics oriented developments mainly technological aspects of complex oxide thin film deposition as an enabling technology to explore the physics of these materials. It consists of two parts: after a brief introduction to the materials development prior to the discovery of superconducting copper oxides, a description of the relevant properties of copper oxide superconductors with focus on YBa 2 Cu 3 O 7-δ is given, followed by the coverage of essentials of complex oxide thin film deposition technology with the copper oxides at its core. Here, the major physical vapor deposition technologies (evaporation and oxide molecular beam technology, sputtering and pulsed laser deposition) are described followed by an overview of substrate requirements to deposit high quality thin films. Opportunities by choosing special substrates with unique properties far beyond the usual mechanical support for a film are introduced with examples aside from usual lattice mismatch induced strain effects. One is the continuous modification of the strain state by poling ferroelectric oxide substrates linked to a piezoelectric effect, the other is the nanoscale tailoring of substrate step-and-terrace structures resulting in a controllable generation of planar defects in complex oxides, thus contributing to the physics of flux-line pinning in cuprate superconductors. In the second part of this review, first some highlights of single layer thin film research are given such as to tailor thin film orientation, generating well defined antiphase boundaries in YBa 2 Cu 3 O 7-δ thin films as flux-line pinning centers as well as contributions to understand fluctuation conductivity in relation to the pseudogap state. In the last section new developments in high T c cuprate based heterostructures and superlattices are reviewed with a special focus on the opportunities offered by interface-induced electronic interactions.

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Control of growth direction of epitaxial YBaCuO thin films on SrTiO3-substrates

Cited by 108 publications

References 6 publications

Epitaxial growth and properties of YBaCuO thin films

Epitaxial growth and properties of YBaCuO thin films

Preparation of a ferromagnetic barrier in YBa2Cu3O7–δ thinner than the coherence length

Science and technology of cuprate-based high temperature superconductor thin films, heterostructures and superlattices—the first 30 years (Review Article)

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