Untangling surface oxygen exchange effects in YBa2Cu3O6+x thin films by electrical conductivity relaxation

Cayado, Pablo; Sánchez-Valdés, C.F.; Stangl, Alexander; Coll, Mariona; Roura, P.; Palau, Anna; Puig, T.; Obradors, X.

doi:10.1039/c7cp01855j

Cited by 20 publications

(33 citation statements)

References 95 publications

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“… 46 , 47 We suggest that the silver layer deposited at the yttria surface has a catalytic effect accelerating the diffusion of oxygen into the GdBCO layer, as it has been previously demonstrated in YBCO films. 48 , 49 …”

Section: Resultsmentioning

confidence: 99%

Chemical Solution Deposition of Insulating Yttria Nanolayers as Current Flow Diverter in Superconducting GdBa₂Cu₃O_7−δ Coated Conductors

et al. 2022

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The primary benefit of a metallic stabilization/shunt in high temperature superconductor (HTS) coated conductors (CCs) is to prevent joule heating damage by providing an alternative path for the current flow during the HTS normal state transition (i.e., quench). However, the shunt presence in combination with unavoidable fluctuations in the critical current ( I c ) of the HTS film can develop a localized quench along the CC’s length if the operational current is kept close to I c . This scenario, also known as the hot-spot regime, can lead to the rupture of the CC if the local quench does not propagate fast enough. The current flow diverter (CFD) is the CC architecture concept that has proven to increase the conductor’s robustness against a hot-spot regime by simply boosting the quench velocity in the CC, which avoids the shunt compromise in some applications. This work investigates a practical manufacturing route for incorporating the CFD architecture in a reel-to-reel system via the preparation of yttrium oxide (Y 2 O 3 ) as an insulating thin nanolayer (∼100 nm) on top of a GdBa 2 Cu 3 O 7 (GdBCO) superconductor. Chemical solution deposition (CSD) using ink jet printing (IJP) is shown to be a suitable manufacturing approach. Two sequences of the experimental steps have been investigated, where oxygenation of the GdBCO layer is performed after or before the solution deposition and the Y 2 O 3 nanolayer thermal treatment formation step. A correlated analysis of the microstructure, in situ oxygenation kinetics, and superconducting properties of the Ag/Y 2 O 3 /GdBCO trilayer processed under different conditions shows that a new customized functional CC can be prepared. The successful achievement of the CFD effect in the case of the preoxygenated customized CC was confirmed by measuring the current transfer length, thus demonstrating the effectiveness of the CSD-IJP as a processing method.

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Section: Resultsmentioning

confidence: 99%

Chemical Solution Deposition of Insulating Yttria Nanolayers as Current Flow Diverter in Superconducting GdBa₂Cu₃O_7−δ Coated Conductors

et al. 2022

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“…However, in recent years, this process has been treated in a different perspective, giving more importance to the surface reactions, which may be the slowest step in the whole chain of oxygen exchange. Following this perspective, Cayado et al have explained oxygen diffusion in the case of YBCO films as a surface-controlled process with several surface reactions linked together, in which the chemisorption process leading to the formation of ionized molecules or the dissociation of the molecules leading to the formation of ions at the surface is the rate-determining step (rds) for these films . However, possible differences in the oxygen diffusion in REBCO films with different RE ions have not been deeply studied yet.…”

Section: Introductionmentioning

confidence: 99%

Determination of the Oxygen Chain Ordering in REBa₂Cu₃O_7–δ by Electrical Conductivity Relaxation Measurements

Cayado

Hauck

Barthlott

et al. 2021

ACS Appl. Electron. Mater.

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Electrical conductivity relaxation was measured to investigate the kinetics of oxygen incorporation (in-diffusion process) and excorporation (out-diffusion process) in different epitaxial REBa2Cu3O7−δ thin films prepared by chemical solution deposition. The oxygen diffusion in these compounds happens in two distinct regimes with different activation energies, which depend on the compound. As the detailed X-ray analysis of similarly processed REBa2Cu3O7−δ films revealed, the transition temperature between these two regimes is compatible with a transition in the oxygen ordering in the Cu–O chains from the Ortho-II phase to the Ortho-I phase. These transitions may be of great importance for further optimization of the oxygenation process during the synthesis of these compounds but may depend not only on the rare-earth (RE) element but also on further factors such as variations of stoichiometry. The presented electrical conductivity measurements provide easy access to the determination of these transition temperatures.

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“…49,66 It's, however, well known that oxygen kinetics in oxides may be strongly inuenced by local strain and surface barriers and so we cannot fully disregard that some oxygen deciency remains. [67][68][69] In summary, we have provided evidence for the suppression of superconductivity at the nanoscale in the Y248 intergrowths, although the microscopic origin of this behavior remains an open issue. As it was recently reported, the Cu-O double chains of Y248 intergrowths include a high concentration of defective clusters consisting of two Cu vacancies decorated by three O vacancies.…”

Section: Superconducting Propertiesmentioning

confidence: 83%

Suppression of superconductivity at the nanoscale in chemical solution derived YBa₂Cu₃O_7−δthin films with defective Y₂Ba₄Cu₈O₁₆intergrowths

Coll

Mundet

et al. 2020

Nanoscale Adv.

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Untangling surface oxygen exchange effects in YBa₂Cu₃O_6+x thin films by electrical conductivity relaxation

Cited by 20 publications

References 95 publications

Chemical Solution Deposition of Insulating Yttria Nanolayers as Current Flow Diverter in Superconducting GdBa₂Cu₃O_7−δ Coated Conductors

Chemical Solution Deposition of Insulating Yttria Nanolayers as Current Flow Diverter in Superconducting GdBa₂Cu₃O_7−δ Coated Conductors

Determination of the Oxygen Chain Ordering in REBa₂Cu₃O_7–δ by Electrical Conductivity Relaxation Measurements

Suppression of superconductivity at the nanoscale in chemical solution derived YBa₂Cu₃O_7−δthin films with defective Y₂Ba₄Cu₈O₁₆intergrowths

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Untangling surface oxygen exchange effects in YBa2Cu3O6+x thin films by electrical conductivity relaxation

Cited by 20 publications

References 95 publications

Chemical Solution Deposition of Insulating Yttria Nanolayers as Current Flow Diverter in Superconducting GdBa2Cu3O7−δ Coated Conductors

Chemical Solution Deposition of Insulating Yttria Nanolayers as Current Flow Diverter in Superconducting GdBa2Cu3O7−δ Coated Conductors

Determination of the Oxygen Chain Ordering in REBa2Cu3O7–δ by Electrical Conductivity Relaxation Measurements

Suppression of superconductivity at the nanoscale in chemical solution derived YBa2Cu3O7−δthin films with defective Y2Ba4Cu8O16intergrowths

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Untangling surface oxygen exchange effects in YBa₂Cu₃O_6+x thin films by electrical conductivity relaxation

Chemical Solution Deposition of Insulating Yttria Nanolayers as Current Flow Diverter in Superconducting GdBa₂Cu₃O_7−δ Coated Conductors

Chemical Solution Deposition of Insulating Yttria Nanolayers as Current Flow Diverter in Superconducting GdBa₂Cu₃O_7−δ Coated Conductors

Determination of the Oxygen Chain Ordering in REBa₂Cu₃O_7–δ by Electrical Conductivity Relaxation Measurements

Suppression of superconductivity at the nanoscale in chemical solution derived YBa₂Cu₃O_7−δthin films with defective Y₂Ba₄Cu₈O₁₆intergrowths