Strong isotropic flux pinning in solution-derived YBa2Cu3O7−x nanocomposite superconductor films

Gutiérrez, J.; Llordés, Anna; Gàzquez, Jaume; Gibert, Marta; Romà, N; Ricart, S.; Pomar, A.; Sandiumenge, F.; Mestres, N.; Puig, T.; Obradors, X.

doi:10.1038/nmat1893

Cited by 568 publications

(553 citation statements)

References 48 publications

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“…While in the first superconducting cables the critical currents were limited by weak links, in the second generation superconducting wires based on aligned YBa 2 Cu 3 O 7 (YBCO) films this problem was mostly resolved and critical currents are determined by vortex pinning. An impressive progress has been made to enhance critical currents in these films using both isotropic [1][2][3][4][5][6][7] and columnar [8][9][10] inclusions. In spite of this progress, understanding of strong pinning mechanisms is far from satisfactory.…”

Section: Introductionmentioning

confidence: 99%

Theory and simulations on strong pinning of vortex lines by nanoparticles

Koshelev

Kolton

2011

Phys. Rev. B

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Pinning of vortex lines by array of nanoparticles embedded inside superconductors became the most efficient practical way to achieve high critical currents. In this situation pinning occurs via trapping of the vortex-line segments and the critical current is determined by the typical length of trapped segment. To verify analytical estimates and develop a quantitative description of strong pinning, we numerically simulated isolated vortex lines driven through array of nanoparticles. We found that the critical force grows roughly as a square root of the pin density and it is strongly suppressed by thermal noise. The configurations of pinned lines are strongly anisotropic, displacements in the drive directions are much larger than in the transverse direction. Moreover, we found that the roughening index for the longitudinal displacements exceeds one. This indicates that the local stresses in the critical region increase with the total line length and the elastic description breaks down in the thermodynamic limit. Thermal noise reduces the anisotropy of displacements in the critical regions and straightens the lines.

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Section: Introductionmentioning

confidence: 99%

Theory and simulations on strong pinning of vortex lines by nanoparticles

Koshelev

Kolton

2011

Phys. Rev. B

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“…In the last study the observed correlated pinning along the c-axis was related to misfit dislocations between the nanoparticles and the superconducting matrix, which aligned along the c direction, with an areal density of 400 µm -2 compared to 80 µm -2 for undoped YBCO films. recently processed from complex metal-organic solutions [43]. These films showed strong isotropic flux pinning generated by stacking faults and other lattice defects emanating in the YBCO from the embedded nanoparticles.…”

Section: Artificial Introduction Of Flux Pinning Nanostructuresmentioning

confidence: 98%

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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“…[1][2][3][4][5] These CCs are promising for superconducting magnet applications because of their high I c density, low dependency of the I c on the external magnetic field, good mechanical properties and reasonable cost, which offer opportunities to develop ultra-high-field magnets. [6][7][8] Unfortunately, these CCs have not been used in superconducting devices with persistent current mode (PCM) operation such as magnets for magnetic resonance applications owing to the unavailability of fabrication techniques for proper joining and contacts.…”

Section: Introductionmentioning

confidence: 99%

A superconducting joint for GdBa2Cu3O7−δ-coated conductors

et al. 2014

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Second-generation (2G) GdBCO-coated conductors (CCs) are promising for superconducting magnet applications because of their high critical current (I c ) density, low dependency of the I c on the external magnetic field, good mechanical properties and reasonable cost, which offer opportunities to develop ultra-high-field magnets. However, they have not been used in hightemperature superconducting (HTS) applications with persistent current mode (PCM) operation such as nuclear magnetic resonance/magnetic resonance imaging magnets owing to unavailability of fabrication techniques for proper joining and contacts. Here we report a resistance-free joint, termed a 'superconducting joint', for 2G GdBCO CCs that forms a direct connection to establish a superconducting closed loop for PCM operation. The I c value of the joined CCs is identical to that of the parent conductors in a liquid nitrogen bath (77 K). Moreover, the initially induced magnetic field of a model GdBCO coil containing a superconducting joint is maintained without decreasing, indicating the complete absence of electrical resistance. Thus, this fabrication method is a unique practical solution for lengthening the 2G HTS CCs and, more importantly, achieving PCM operation in 2G HTS magnet applications, including ultra-high-field nuclear magnetic resonance/magnetic resonance imaging magnets generating more than 1 GHz.

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Strong isotropic flux pinning in solution-derived YBa2Cu3O7−x nanocomposite superconductor films

Cited by 568 publications

References 48 publications

Theory and simulations on strong pinning of vortex lines by nanoparticles

Theory and simulations on strong pinning of vortex lines by nanoparticles

Nanotechnologies to Enable High‐Performance Superconductors for Energy Applications

A superconducting joint for GdBa2Cu3O7−δ-coated conductors

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