Enhanced flux pinning isotropy by tuned nanosized defect network in superconducting YBa2Cu3O6+x films

Khan, Mukarram Zaman; Rivasto, Elmeri; Tikkanen, J.; Rijckaert, Hannes; Malmivirta, Mika; Liedke, Maciej Oskar; Butterling, Maik; Wagner, A.; Huhtinen, H.; Driessche, Isabel Van; Paturi, P.

doi:10.1038/s41598-019-51978-0

Cited by 31 publications

(40 citation statements)

References 44 publications

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“…The deposition was performed by applying 1500 pulses with a growth rate of 0.1 nm/pulse, producing a 150nm YBCO thick layer. This growth rate was previously confirmed by transmission electron microscopy (TEM), under the same deposition conditions [15]. The superconducting transition temperature ( ∼ 90 K) was determined by resistivity and magnetization measurements, confirming that the YBCO films are near optimally doped.…”

Section: Methodssupporting

confidence: 72%

YBCO-based non-volatile ReRAM tested in Low Earth Orbit

Enrique

Barella

Sanca

et al. 2020

J Mater Sci: Mater Electron

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An YBCO-based test structure corresponding to the family of ReRAM devices associated with the valence change mechanism is presented. We have characterized its electrical response previous to its lift-off to a Low Earth Orbit (LEO) using standard electronics and also with the dedicated LabOSat-01 controller. Similar results were obtained in both cases. After about 200 days at LEO on board a small satellite, electrical test started on the memory device using the LabOSat-01 controller. We discuss the results of the first 150 tests, performed along a 433-day time interval in space. The memory device remained operational despite the hostile conditions that involved launching, lift-off vibrations, permanent thermal cycling, and exposure to ionizing radiation, with doses 3 orders of magnitude greater than the usual ones on Earth. The device showed resistive switching and IV characteristics similar to those measured on Earth, although with changes that follow a smooth drift in time. A detailed study of the electrical transport mechanisms, based on previous models that indicate the existence of various conducting mechanisms through the metal-YBCO interface showed that the observed drift can be associated with a local temperature drift at the LabOSat controller, with no clear evidence that allows determining changes in the underlying microscopic factors. These results show the reliability of complex-oxide non-volatile ReRAM-based devices in order to operate under all the hostile conditions encountered in space-borne applications.

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Section: Methodssupporting

confidence: 72%

YBCO-based non-volatile ReRAM tested in Low Earth Orbit

Enrique

Barella

Sanca

et al. 2020

J Mater Sci: Mater Electron

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“…Effects of nanorods. One of the most common features of nanorods experimentally encountered in thin films is their splay and fragmentation, the effects of which to YBCO c-axis peak have already been comprehensively studied in 24 , where the increasing splay of nanorods was reported to decrease the absolute value of critical current. Double peak structures were observed for all tilting angles of nanorods, but interestingly this double peak structure was most pronounced without any splay at zero angle.…”

Section: Resultsmentioning

confidence: 99%

“…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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“…The films were deposited by applying 1500 pulses with a growth rate of 0.1 nm/pulse, producing the 150 nm thick layer as earlier confirmed by transmission electron microscopy (TEM) calibrations under the same deposition conditions. [22] Details of their synthesis and characterization can be found elsewhere (see also Suppl. Material) .…”

Section: Introductionmentioning

confidence: 99%

Electrical conduction mechanisms of metal / high-T _c superconductor (YBCO) interfaces

Lanosa

Huhtinen

Paturi

et al. 2020

J. Phys.: Condens. Matter

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Current-voltage characteristics of Au / YBa 2 Cu 3 O 7−δ interfaces (Au/YBCO), built on optimallydoped YBCO thin films, grown by pulsed laser deposition, were measured as a function of temperature in the 50 K to 270 K range, for two different resistance states. A non-trivial equivalent circuit model is proposed, which reveals the existence of a highly inhomogeneous scenario composed by two complex layers: one presenting both a non-linear Poole-Frenkel conduction as well as Variable Range Hopping localization effects (probably associated with YBa 2 Cu 3 O 6 ) mixed with a minor metallic phase, while the other is also composed by a mixture of YBCO with different oxygen contents, where a metallic ohmic phase still percolates. A microscopic description of the effects produced by the resistance switching is given, showing the evolution of carrier traps, localization effects and dielectric behavior for each state. The dielectric behavior is interpreted in terms of a Maxwell-Wagner scenario.

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Enhanced flux pinning isotropy by tuned nanosized defect network in superconducting YBa2Cu3O6+x films

Cited by 31 publications

References 44 publications

YBCO-based non-volatile ReRAM tested in Low Earth Orbit

YBCO-based non-volatile ReRAM tested in Low Earth Orbit

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

Electrical conduction mechanisms of metal / high-T _c superconductor (YBCO) interfaces

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Enhanced flux pinning isotropy by tuned nanosized defect network in superconducting YBa2Cu3O6+x films

Cited by 31 publications

References 44 publications

YBCO-based non-volatile ReRAM tested in Low Earth Orbit

YBCO-based non-volatile ReRAM tested in Low Earth Orbit

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

Electrical conduction mechanisms of metal / high-T c superconductor (YBCO) interfaces

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Electrical conduction mechanisms of metal / high-T _c superconductor (YBCO) interfaces