Structural and flux-pinning properties of laser ablated YBa2Cu3O7−δ thin films: Effects of self-assembled CeO2 nanodots on LaAlO3 substrates

Haywood, Talisha M.; Oh, Sang Ho; Kebede, Abede; Pai, Devdas; Sankar, Jag; Christen, D. K.; Pennycook, Stephen J.; Kumar, Dhananjay

doi:10.1016/j.physc.2008.07.008

Cited by 5 publications

(3 citation statements)

References 15 publications

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“…A similar decrease of T c was observed e.g. in Y211/Y123 multilayers [6], with addition of Y 2 O 3 layers to YBCO [5,7], in YBCO quasi-multilayers with various transition metals such as Ti, Zr, Hf [8] and in YBCO structures with CeO 2 or YSZ layers [18,23,49]. The transition width T c is almost the same in our multistructures until the number or thickness of BZO layers increases remarkably as seen in samples M-YB4 and M-YB5.…”

Section: Structural Analysissupporting

confidence: 71%

“…Usually YBCO multistructures show a broadening Generally, a significant enhancement of j c has been observed [4,6,13,17], but a couple of effects have to be taken into consideration. It is usually suggested that very thin complete dopant layers or even quasi-multilayers resulting in separated islands of dopants are most effective [7,8,11,23]. Multilayer structures are highly anisotropic, having a clear angular dependence in superconducting properties, and the best improvement in j c values is usually observed when magnetic field is along the YBCO ab-plane [3,10,24].…”

Section: Introductionmentioning

confidence: 99%

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Growth andc-axis flux pinning of nanostructured YBCO/BZO multilayers

Huhtinen¹,

Schlesier²,

Paturi³

2009

Supercond. Sci. Technol.

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A systematic investigation of superconducting multilayered films composed of alternating nanostructured YBa2Cu3O6+x (YBCO) and secondary phase BaZrO3 (BZO) layers is carried out. Detailed growth mechanism studies of these structures as well as superconducting properties in a wide temperature and magnetic field range are investigated by varying the thicknesses of layers grown by pulsed laser deposition. Structural analysis shows that multilayering changes clearly the growth mechanism of YBCO. Alternating thin BZO layers smoothen the film surface, create in-plane mosaic spread structure of the YBCO crystals, produce stress in the BZO interface region and moreover improve the out-of-plane alignment of YBCO. Magnetic measurements of superconducting properties demonstrate that the critical temperature decreases slightly when the thickness of the BZO layers increases relative to the YBCO layers. This indicates a growing strain effect at the layer interfaces. At the same time, critical current densities of multilayers in the whole used temperature and magnetic field range are increased to the same level as in conventionally BZO-doped YBCO films when very thin alternating YBCO/BZO layer structures are deposited. This thickness dependent result is explained by the dense flux pinning centre network in layered superconductors, giving the opportunity to increase the overall thickness of a film and further enhance the current-carrying capability.

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Section: Structural Analysissupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Growth andc-axis flux pinning of nanostructured YBCO/BZO multilayers

Huhtinen¹,

Schlesier²,

Paturi³

2009

Supercond. Sci. Technol.

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“…The primary requirement for thin film deposition is a clean substrate surface, and several oxide substrates have been used for the growth of YBa 2 Cu 3 O x (YBCO) high T c superconducting thin film, including SrTiO 3 , LaAlO 3 , sapphire, and MgO. [ 1–15 ] Among all these oxide substrates, single‐crystal MgO substrates are favored for the high T c superconducting thin films deposition due to their low index of refraction ( n = 1.73), high melting point of 2976 °C, low dielectric loss, similar thermal expansion coefficient as that of YBCO thin films, low cost, and growth of epitaxial development of YBCO thin films formed on them despite a considerable lattice mismatch (≈of 9%). [ 16–20 ] Various devices, including step‐edges, Josephson junction (JJ)‐based devices, and superconducting quantum interference devices (SQUIDs), are made with a thin film of YBCO grown on MgO substrates.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Transport Characteristics of YBCO Step‐Edge‐Based Josephson Junction on Revived MgO Substrate

Dahiya

Pal

Khare

2021

Physica Status Solidi (b)

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Herein, the combined impact of ion beam milling and postannealing treatment on the transport properties of deposited YBa2Cu3Ox (YBCO) thin film and fabricated step‐edge Josephson junction (JJ) on degraded MgO (100) substrates are investigated, and the obtained results of the YBCO thin film and fabricated step‐edge JJ on treated MgO (100) substrate are compared with the YBCO film and step‐edge junction on a fresh MgO substrate. Structural study reveals the formation of c‐axis‐oriented YBCO thin film on revived MgO substrate which is very much comparable with the YBCO film on fresh substrate. Atomic force microscopy (AFM) technique is used to confirm the step heights of the fabricated step‐edges on fresh, revived, and degraded MgO substrates. After the treatment, the surface roughness of MgO substrate has reduced from 56 to 1.06 nm which is comparable with the fresh MgO (100) substrate. The acquired values of critical temperatures for as‐deposited YBCO thin film on fresh and revived MgO substrates are 89.1 and 88.3 K, respectively, whereas these values are 85.8 and 85.7 K for the fabricated step‐edge junction microbridges on these deposited thin films. For both the fabricated step‐edge junction on the revived and fresh MgO substrate, the superconductor–normal metal–superconductor‐type JJ is confirmed.

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Investigations of Knight shifts and g factors for Y123 and Y124 superconductors

Kuang

et al. 2013

Physica C: Superconductivity

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Structural and flux-pinning properties of laser ablated YBa2Cu3O7−δ thin films: Effects of self-assembled CeO2 nanodots on LaAlO3 substrates

Cited by 5 publications

References 15 publications

Growth andc-axis flux pinning of nanostructured YBCO/BZO multilayers

Growth andc-axis flux pinning of nanostructured YBCO/BZO multilayers

Fabrication and Transport Characteristics of YBCO Step‐Edge‐Based Josephson Junction on Revived MgO Substrate

Investigations of Knight shifts and g factors for Y123 and Y124 superconductors

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