Enhanced flux pinning in YBCO multilayer films with BCO nanodots and segmented BZO nanorods

Malmivirta, Mika; Rijckaert, Hannes; Paasonen, Ville; Huhtinen, H.; Hynninen, Teemu; Jha, Rajveer; Awana, Veerpal Singh; Driessche, Isabel Van; Paturi, P.

doi:10.1038/s41598-017-13758-6

Cited by 26 publications

(28 citation statements)

References 43 publications

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“…Above 700°C, the BaF 2 phase is reduced due to the reaction with the Y 2 Cu 2 O 5 phase to the final YBCO 6 phase. This observation corresponds to literature data and shows the reactivity of single metal oxide nanocrystals during the nucleation and growth of YBCO film.

2 CuO + {normalY}_{2} {normalO}_{3} \to {normalY}_{2} {Cu}_{2} {normalO}_{5}

{normalY}_{2} {Cu}_{2} {normalO}_{5} + 2 {Ba(O,F)}_{2} + 4 CuO \underset{{normalH}_{2} O}{false\to} 2 {YBa}_{2} {Cu}_{3} {normalO}_{7 - x} + 4 HF

…”

Section: Resultssupporting

confidence: 91%

“…The nucleation and growth of TFA‐based or reduced fluorine‐based YBCO systems can be found in literature and is described as the ex situ BaF 2 process . Generally, it is reported that the formation of BaF 2 instead of BaCO 3 occurs when a fluorine content of more than 15.4% is used .…”

Section: Resultsmentioning

confidence: 99%

“…These mechanisms are already been described in literature, but it is still unknown what the influence of the preformed nanocrystals is on the nucleation and growth mechanism. While pulsed laser deposition is already an advanced research method to elucidate the effects of nano‐sized secondary phases on the pinning landscape in high‐temperature superconducting films, there is limited knowledge of the control over the formation of nano‐sized secondary phases during nucleation and growth step of CSD‐YBCO methods. In previous research, it was seen that the addition of single metal oxide nanocrystals (eg, ZrO 2 ) leads to the formation of double metal oxide nanocrystals (eg, BaZrO 3 ) due to its Ba 2+ consumption.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Ba²⁺ consumption and intermediate dwelling during processing of YBa₂Cu₃O₇ nanocomposite films

et al. 2018

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Achieving high-critical current densities (J c ) with small artificial pinning centers is a crucial challenge for YBa 2 Cu 3 O 7−δ (YBCO) nanocomposite thin films fabricated using chemical solution deposition methods. In this work, the YBCO texture, structure purity, and its J c properties were improved by understanding the influence of preformed ZrO 2 nanocrystals (Ba 2+ consumption) during the nucleation and growth mechanism. This comprehensive study leads to an additional intermediate dwelling step during thermal process to increase the YBCO nuclei density before the YBCO growth, resulting to a self-field J c of 5-6 MA/cm 2 at 77 K for undoped and ZrO 2 -doped YBCO films. Counter-intuitively, the space and size distribution of the ZrO 2 nanocrystals in the YBCO matrix are independent of this intermediate dwelling step. K E Y W O R D S chemical solution deposition, low-fluorine YBCO, nanocomposite, nanoparticles, vortex pinning

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2 CuO + {normalY}_{2} {normalO}_{3} \to {normalY}_{2} {Cu}_{2} {normalO}_{5}

{normalY}_{2} {Cu}_{2} {normalO}_{5} + 2 {Ba(O,F)}_{2} + 4 CuO \underset{{normalH}_{2} O}{false\to} 2 {YBa}_{2} {Cu}_{3} {normalO}_{7 - x} + 4 HF

…”

Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Ba²⁺ consumption and intermediate dwelling during processing of YBa₂Cu₃O₇ nanocomposite films

et al. 2018

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“…In the paper 25 , where the validation of the molecular dynamics (MD) simulation used in this work is presented, the effect of nanorod diameter was shortly studied as a demonstration of the feasibility of the simulation, but a detailed analysis on this subject is still lacking. The simulation model has also been used in our previous work 9 to analyse critical current anisotropies in multilayer films containing both nanodots and nanorods and the effect of the splay and fragmentation of the nanorods on J c (θ)-peak in the vicinity of YBCO c-axis (c-peak) has been studied in 24 .…”

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confidence: 99%

Self-assembled nanorods in YBCO matrix – a computational study of their effects on critical current anisotropy

Rivasto

Khan

Malmivirta

et al. 2020

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In order to understand how the doping with self-assembled nanorods of different sizes and concentrations as well as applied magnetic fields affect the critical current anisotropy in YBa 2 cu 3 o 7−x (YBCO) thin films close to YBCO c-axis, we present an extensive and systematic computational study done by molecular dynamics simulation. the simulations are also used to understand experimentally measured J c (θ) curves for BaHfO 3 , BaZrO 3 and BaSno 3 doped YBCO thin films with the help of nanorod parameters obtained from transmission electron microscopy measurements. our simulations reveal that the relation between applied and matching field plays a crucial role in the formation of J c (θ)-peak around YBCO c-axis (c-peak) due to vortex-vortex interactions. We also find how different concentrations of different size nanorods effect the shape of the c-peak and explain how different features, such as double c-peak structures, arise. In addition to this, we have quantitatively explained that, even in an ideal superconductor, the overdoping of nanorods results in decrease of the critical current. our results can be widely used to understand and predict the critical current anisotropy of YBco thin films to improve and develop new pinscapes for various transport applications.High temperature superconductors (HTS) are expected to have large number of applications in different fields of technology and power industry in the future 1-3 . Since all known HTS are of type II, the critical current passed through them is highly dependent on the surrounding magnetic field due to the movement of vortices. Thus, to enhance and widen the usability of HTS, the dynamics of vortices need to be well understood.Among the high temperature superconductors, YBa 2 Cu 3 O 7−x (YBCO) seems the most practical choice when thinking for the applications 1 . The intrinsic anisotropy of the critical current, in thin films and coated conductors, can be modified by adding impurities within the lattice of YBCO which pin the vortices restricting their movement. Based on growth conditions and lattice mismatch between the YBCO and the dopant as well as their elastic properties 4,5 , impurities such as Y 2 O 3 6 , BaCeO 3 7-9 and BaZrO 3 (BZO) 10,11 can form uncorrelated randomly distributed nanoparticles within the YBCO lattice. Under optimized deposition conditions, via a spontaneous phase-separation and strain-driven self-assembly process during film deposition 12 , self-assembly of nanorods of BaHfO 3 (BHO) 1 , BaZrO 3 (BZO) 4,13,14 , BaSnO 3 (BSO) 15,16 , Ba 2 YTaO 3 (BYTO) 17 or Ba 2 YNbO 6 (BYNO) 18 within the YBCO lattice can be realized.Recently, a topic of interest has been to add both point-like nanodots and nanorods within the YBCO lattice simultaneously. This has been achieved by doping YBCO simultaneously with both BYTO and BYNO (referred as BYNTO) with an additional rare earth oxide, leading to continuous niobiate/tantalate nanorods and rare-earth oxide nanoparticles 19 . A lot of experimental research has been done in order to understand the...

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“…Intensive research on fabrication of BZO doped YBCO films was conducted in the past [7][8][9][10][11]. However, limited study of BZO doped YBCO bulks has been reported so far [5,12].…”

Section: Introductionmentioning

confidence: 99%

Comparative Study on AC Susceptibility of YBa2Cu3O7−δ Added with BaZrO3 Nanoparticles Prepared via Solid-State and Co-Precipitation Method

et al. 2019

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Polycrystalline samples of YBa2Cu3O7−δ (Y-123) added with x mol% of BaZrO3 (BZO) nanoparticles (x = 0.0, 2.0, 5.0, and 7.0) were synthesized using co-precipitation (COP) and solid-state (SS) method. X-ray diffraction (XRD) patterns showed the formation of Y-123 and Y-211 as the major and minor phases, respectively. The samples prepared using COP method showed higher weight percentage of Y-123 phase (≤98%) compared to the SS samples (≤93%). A peak corresponding to BZO was also found in the samples added with BZO nanoparticles. The increasing intensity of the BZO peak as the BZO amount increased showed the increasing amount of the unreacted nanoparticles in the samples. Refinement of unit cell lattice parameters indicated that all the samples have an orthorhombic crystal structure and there is no orthorhombic-tetragonal phase transformation. As observed using scanning electron microscopy (SEM), all the samples showed randomly distributed grains with irregular shape. The average grain size for the pure sample prepared using COP method is smaller (0.30 µm) compared with that of the pure SS sample (1.24 µm). Addition of 7.0 mol% BZO led to an increase of average grain size to 0.50 μm and 2.71 μm for the COP and SS samples, respectively, indicating grain growth. AC susceptibility (ACS) measurement showed a decrease in the onset critical temperature, Tc-onset with BZO addition. Comparatively, Tc-onset for the COP samples is higher than that of the SS samples. The value of Josephson’s current, Io increased up to 2.0 mol% BZO addition, above which the Io decreased more drastically for the SS samples. The value of Io is 53.95 μA and 32.08 μA for the 2.0 mol% BZO added SS and COP samples, respectively. The decrease of Io is attributed to the distribution of BZO particles at the grain boundaries as also reflected in the drastic decrease of phase lock-in temperature, Tcj. As a result of smaller average grain size, the presence of more grain boundaries containing insulating BZO particles led to lower Io in the COP samples.

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Enhanced flux pinning in YBCO multilayer films with BCO nanodots and segmented BZO nanorods

Cited by 26 publications

References 43 publications

Influence of Ba²⁺ consumption and intermediate dwelling during processing of YBa₂Cu₃O₇ nanocomposite films

Influence of Ba²⁺ consumption and intermediate dwelling during processing of YBa₂Cu₃O₇ nanocomposite films

Self-assembled nanorods in YBCO matrix – a computational study of their effects on critical current anisotropy

Comparative Study on AC Susceptibility of YBa2Cu3O7−δ Added with BaZrO3 Nanoparticles Prepared via Solid-State and Co-Precipitation Method

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Enhanced flux pinning in YBCO multilayer films with BCO nanodots and segmented BZO nanorods

Cited by 26 publications

References 43 publications

Influence of Ba2+ consumption and intermediate dwelling during processing of YBa2Cu3O7 nanocomposite films

Influence of Ba2+ consumption and intermediate dwelling during processing of YBa2Cu3O7 nanocomposite films

Self-assembled nanorods in YBCO matrix – a computational study of their effects on critical current anisotropy

Comparative Study on AC Susceptibility of YBa2Cu3O7−δ Added with BaZrO3 Nanoparticles Prepared via Solid-State and Co-Precipitation Method

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Influence of Ba²⁺ consumption and intermediate dwelling during processing of YBa₂Cu₃O₇ nanocomposite films

Influence of Ba²⁺ consumption and intermediate dwelling during processing of YBa₂Cu₃O₇ nanocomposite films