Origin of high critical currents in YBa2Cu3O7−δ superconducting thin films

Dam, B.; Huijbregtse, J.M.; Klaassen, F.M.; Geest, R.C.F. van der; Doornbos, G.; Rector, J.H.; Testa, A. M.; Freisem, S.; Martı́nez, J. C.; Stäuble-Pümpin, B.; Griessen, R.

doi:10.1038/20880

Cited by 443 publications

(316 citation statements)

References 22 publications

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“…At the same time, at the low field region (self-field region), the 5 Hz film exhibits the most optimal properties at low temperatures. These differences are likely the ground for existing inconsistencies in determining the pinning mechanism in the PLD YBCO films, ranging from dislocation dominance 28,29,61,85 and twin boundaries 81 to small non-superconducting inclusions of Y 2 O 3 83,84 and even surface pinning 86 and Josephson-like weak-links 79 , which may simply represent different but limited aspects of the entire picture, as shown in this work.…”

Section: B Ybco Thin Filmsmentioning

confidence: 99%

“…Note, B * can be defined as the field at which the critical current reaches the 90% 79 or 95% 77,78 of the value obtained for zero applied field. However, in this work it is sufficient to qualitatively demonstrate that B * is the transition from a plateau-like J c (B a ) dependence to the power-law dependence and is directly proportional to dislocation density (as well as to the island density at any thickness of the film) 61,77 . The characteristic field B * increases with increasing laser frequency [ Fig.…”

Section: B Ybco Thin Filmsmentioning

confidence: 99%

“…7, the low field region of J c (B a ) dependences at 10 K is shown, where the so-called characteristic field B * can be determined at the crossing of the extensions to the two linear regions according to Ref. 61 . This field, denoting transition from the single vortex pinning regime at low fields to a collective pinning regime at higher fields, can be used to accurately determine the pinning radius of the individual vortex pinning 77,78 .…”

Section: B Ybco Thin Filmsmentioning

confidence: 99%

“…A moving flux-line lattice causes energy dissipation and, as a result, superconducting performance degradation. The best possible natural pinning centres in YBCO thin films are edge and screw dislocations, in particular for the fields applied parallel to these dislocations 27,61,75 . These dislocations are formed in the out-of-plane direction during pulsed laser deposition of the films 28,61,65,75,76 as a result of the YBCO/STO crystal lattice misfit.…”

Section: B Ybco Thin Filmsmentioning

confidence: 99%

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Significant tunability of thin film functionalities enabled by manipulating magnetic and structural nano-domains

Golovchanskiy

Pan

Fedoseev

et al. 2014

Applied Surface Science

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The influence of laser frequency on the structure and physical properties of thin films grown by pulsed laser deposition has been studied. Different types of thin films, hard ferromagnetic FePt L10 and quasi-single crystal superconducting YBa2Cu3O7 (YBCO), have been used for demonstration of the effect. Significant structural modifications have been obtained for the films with similar thicknesses. These modifications are shown to dramatically control their corresponding properties, providing an instrumental ability for tuning the practical characteristics of the films by changing the laser frequency of their deposition. In particular, 20-fold increase of coercive field and modification of demagnetization mechanism are obtained for FePt films by varying the frequency from 1 Hz to 6 Hz. Over a similar frequency range, a strong dependence on the laser frequency is discovered for the YBCO films for the critical current density behavior as a function of the applied magnetic field [ Jc(Ba)] with the unexpected reversal of Jc(Ba) curves with temperature. The mechanisms of structure modifications and corresponding property variations are proposed. The influence of laser frequency on the structure and physical properties of thin films grown by pulsed laser deposition has been studied. Different types of thin films, hard ferromagnetic FePt L10 and quasi-single crystal superconducting YBa2Cu3O7 (YBCO), have been used for demonstration of the effect. Significant structural modifications have been obtained for the films with similar thicknesses. These modifications are shown to dramatically control their corresponding properties, providing an instrumental ability for tuning the practical characteristics of the films by changing the laser frequency of their deposition. In particular, 20-fold increase of coercive field and modification of demagnetization mechanism are obtained for FePt films by varying the frequency from 1 Hz to 6 Hz. Over a similar frequency range, a strong dependence on the laser frequency is discovered for the YBCO films for the critical current density behaviour as a function of the applied magnetic field [Jc(Ba)] with the unexpected reversal of Jc(Ba) curves with temperature. The mechanisms of structure modifications and corresponding property variations are proposed.

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Section: B Ybco Thin Filmsmentioning

confidence: 99%

Section: B Ybco Thin Filmsmentioning

confidence: 99%

Section: B Ybco Thin Filmsmentioning

confidence: 99%

Section: B Ybco Thin Filmsmentioning

confidence: 99%

See 2 more Smart Citations

Significant tunability of thin film functionalities enabled by manipulating magnetic and structural nano-domains

Golovchanskiy

Pan

Fedoseev

et al. 2014

Applied Surface Science

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“…On the other hand, randomly distributed localized defects (uncorrelated pinning centers) can produce very strong pinning, but do not give rise to a peak for H//c in the J c angular dependence at 77 K. One of the first attempts of correlating J c performance for H//c with the density of extended pinning centers along the c axis was carried out in 1999 [28]. The defects targeted by this study were threading edge and screw dislocations normally occurring during the YBCO growth process, especially in PLD films with their columnar growth mode.…”

Section: Enhancing Naturally Occurring Nanoscale Defectsmentioning

confidence: 99%

Nanotechnologies to Enable High‐Performance Superconductors for Energy Applications

Cantoni

Goyal

2013

Nanotechnology for the Energy Challenge

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High Temperature Superconductors (HTS) wires or coated conductors (CC) hold promise to revolutionize the transmission of electricity enabling the present electric grid to meet the world's growing energy needs. Although superconducting wires can carry 150 times more power than copper wires of the same cross section, further performance improvements are necessary for the superconducting technology to become costcompetitive. This objective can be achieved by introducing and controlling nano-sized defects and non-superconducting phases within the superconducting film's matrix. Such nanostructures, when carefully engineered, significantly increase the loss-free current sustained by the superconductor through a mechanism known as flux pinning. This chapter is a review of the various types of nanostructures that are artificially introduced in superconducting films to enhance the superconductor's performance. Different approaches, materials, and techniques are discussed and the most recent results in this field compared. The last section of this chapter discusses an additional example of 2 nanotechnology employment in superconducting wires. This nanotechnology can be regarded as an atomic surface treatment designed to enable the right crystallographic orientation of the superconducting film deposited on the metal template. Overcoming limitations to superconductors' performanceEfficient transport and storage of energy are two key factors in the formidable quest to meet the world's growing energy needs. Because electricity is the energy form of choice for most uses, and the most effective way to transport energy from and to different locations, addressing the energy problem means necessarily addressing the shortcomings of the present electric power grid. Capacity and reliability of the present grid are entirely inadequate to accommodate an expected growth in energy demand of 50% by the year 2030, most of which will be concentrated in urbanized areas whose infrastructures are already severely congested. In addition, 7 -10 % of the electricity generated is lost in the grid by heat dissipation, and transmission limitations have already caused black outs throughout the world. Superconducting cables made with high critical temperature (T c ) cuprate superconductors have the potential to transform the grid to meet the 21 st century demands. Such cables can carry five times more power then copper cables with the same cross section and exhibit considerable lower losses (loss-free dc transmission). Because lower losses enable longer transmission lengths, superconductors provide the best choice for building a new, non-fragmented, super grid that will enable massive long-distance power transmission, interconnect entire continents, and provide widespread, local energy storage. In such a grid, renewable source power plants in the most remote areas can deliver power anywhere in the continent according to real time demands, and episodic 3 surpluses are readily stored for future use. High temperature superconducting (HTS) cabl...

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Optimization of Flux Pinning in Bulk Melt Textured 1-2-3 Superconductors: Bringing Dislocations under Control

et al. 2000

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Structural defects are important in type II superconductors since they are responsible for their supercurrent carrying capacity; however, the engineering of defects has been problematic. This report summarizes the difficulties involved and presents recent results dealing with alternative processing routes, such as high oxygen pressure processing, which gives rise to a higher density of partial dislocations (see Figure) and significantly enhanced critical currents.

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Origin of high critical currents in YBa2Cu3O7−δ superconducting thin films

Cited by 443 publications

References 22 publications

Significant tunability of thin film functionalities enabled by manipulating magnetic and structural nano-domains

Significant tunability of thin film functionalities enabled by manipulating magnetic and structural nano-domains

Nanotechnologies to Enable High‐Performance Superconductors for Energy Applications

Optimization of Flux Pinning in Bulk Melt Textured 1-2-3 Superconductors: Bringing Dislocations under Control

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