c-Axis correlated extended defects and critical current in YBa2Cu3O  films grown on Au and Ag-nano dot decorated substrates

Mikheenko, P.; Sarkar, A.; Dang, Van-Son; Tanner, J.L.; Abell, J.S.; Crisan, A.

doi:10.1016/j.physc.2009.05.001

Cited by 26 publications

(23 citation statements)

References 14 publications

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“…These peaks were not present in YBCO films without nanoparticles. The largest height of the peaks comparable to the lowest value of I c (H) has been achieved in a matching field, which corresponds to the density of magnetic flux of about one vortex per nanoparticle or one vortex per YBCO column when the size of the columns is small, about 20 nm [3].…”

Section: Introductionmentioning

confidence: 89%

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Nanodots induced columnar growth of YBa2Cu3O films

Mikheenko

Tanner

Bowen

et al. 2010

Physica C: Superconductivity and its Applications

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Section: Introductionmentioning

confidence: 89%

“…A good epitaxy inside the columns offers high I c for the directions of magnetic field other than perpendicular to the film plane, in particular it provides a weak field dependence of I c for the field in the ab-plane of YBCO [3].…”

Section: Introductionmentioning

confidence: 99%

Nanodots induced columnar growth of YBa2Cu3O films

Mikheenko

Tanner

Bowen

et al. 2010

Physica C: Superconductivity and its Applications

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“…A large number of samples were investigated as part of this study. Critical temperatures of the films, defined as the temperature of the peak of imaginary alternating current (AC) susceptibility at low amplitude of AC field of 0.5 Oe, were measured and observed to vary typically from 89 to 91 K. The critical current for the magnetic field (H) along the c-axis of the film was derived from the direct-current (DC) magnetic moment [4] and was analysed as a function of magnetic field at a fixed temperature in the range of 5 -77.3 K. The I c for directions of applied magnetic field other than along the c-axis was determined by angle-dependent transport measurements on microbridges patterned using conventional photolithography. Scanning and transmission electron microscopy (SEM, TEM) and energy dispersive x-ray analysis (EDX) were used to analyse element content, micro-and nanostructure of the samples.…”

Section: Methodsmentioning

confidence: 99%

“…The 3D self-assembly was assessed using Gd 2 Ba 4 CuWO x and BaZrO 3 nanoparticles. All the nanoparticles investigated showed significant potential to increase I c-w [4][5][6][7][8] to levels above that observed in pure YBCO films.…”

Section: Introductionmentioning

confidence: 99%

Self-assembled artificial pinning centres in thick YBCO superconducting films

Mikheenko

Abell

Sarkar

et al. 2010

J. Phys.: Conf. Ser.

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Abstract. Strong, artificial pinning centres are required in superconducting films of large thickness for power applications in high magnetic fields. One of the methods for the introduction of pinning centres in such films is substrate decoration, i.e., growing nanoscale islands of certain materials on the substrate prior to the deposition of the superconducting film. Two other methods are building up a layered distribution of a second phase and homogeneous incorporation of second phase inclusions from a compositional target. In this paper, we compare the effectiveness of these methods in terms of the type of the self-assembly of nanoparticles. The comparison is made over a large set of YBa 2 Cu 3 O 7 films of thickness up to 6.6 µm deposited with Au, Ag, Pd, LaNiO 3 , PrBa 2 Cu 3 O 7 , YBCO, BaZrO 3 and Gd 2 Ba 4 CuWO y nanoparticles. It is found that substrate-decoration self-assembly is able to provide higher critical current in low magnetic field than the incorporation of homogeneous second phase in the sample microstructure. By specific modification of substrate decoration we achieved the self-field critical current per centimetre of width of 896 A/cm at 77.3 K and 1620 A/cm at 65 K in a film of thickness of 4.8 µm. IntroductionHigh-current superconducting applications depend strongly on the performance of superconducting tapes. Superconducting tapes, for example, are expected to find a wide use in power transmission lines, magnets, motors, generators, transformers, fault current limiters etc. In these applications they can be exposed to a high magnetic field. To increase the in-field performance of the tapes, it is necessary to incorporate into their microstructure a very dense, nanometer scale, array of pinning centers. A range of different methods for creating such an array using nanoparticles has been suggested and explored. Among these methods are substrate decoration [1], a quasi-superlattice approach [2] and volumetric addition of a secondary phase [3]. Self-assembly of nanoparticles plays an important role in each of these techniques. The first two methods represent two-dimensional (2D) and the third a three-dimensional (3D) approach to self-assembly.

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“…We have investigated mainly thick YBa 2 Cu 3 O 7 (YBCO) films, and have used Ag, Au, Pd, LaNiO 3 , PrBa 2 Cu 3 O 7 and non-superconducting YBCO for substrate decoration and quasi-multilayer approaches [5][6][7][8], and nanocrystalline BaZrO 3 /YBCO as modified target [9].…”

Section: Introductionmentioning

confidence: 99%