Improved Flux Pinning in Y–Ba–Cu–O Superconductors Containing Niobium Oxide

Yeoh, Wai Kong; Pathak, Sandeep; Shi, Yunhua; Dennis, Anthony; Cardwell, D. A.; Babu, N. Hari; Strasik, M.

doi:10.1109/tasc.2009.2019131

Cited by 6 publications

(5 citation statements)

References 12 publications

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“…4,11,12,60 The Y-211 particle size during meltprocessing typically increases to between 1 and 5 μm at high temperature (i.e., 1000 °C for >100 h). 61 The comparison between Figure 8a and 8b confirms that the particle size of sample B2 remains less than 1 μm. This is due to the nanometer dimensions of the starting B2 powder.…”

Section: Resultssupporting

confidence: 54%

“…Normally, superconducting YBCO single grains contain a Y-123 phase matrix with Y-211 particles as inclusions. ,,, The Y-211 particle size during melt-processing typically increases to between 1 and 5 μm at high temperature ( i.e. , 1000 °C for >100 h) . The comparison between Figure a and b confirms that the particle size of sample B2 remains less than 1 μm.…”

Section: Resultsmentioning

confidence: 78%

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Synthesis of YBa₂Cu₃O_7−δ and Y₂BaCuO₅ Nanocrystalline Powders for YBCO Superconductors Using Carbon Nanotube Templates

et al. 2012

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We fabricate nanosized superconducting YBa(2)Cu(3)O(7-δ) (Y-123) and nonsuperconducting Y(2)BaCuO(5) (Y-211) powders using carbon nanotubes as template. The mean particle size of Y-123 and Y-211 is 12 and 30 nm, respectively. The superconducting transition temperature of the Y-123 nanopowder is 90.9 K, similar to that of commercial, micrometer-scale powders fabricated by conventional processing. The elimination of carbon and the formation of a high purity superconducting phase both on the micro- and macroscale is confirmed by Raman spectroscopy and X-ray diffraction. We also demonstrate improvement in the superconducting properties of YBCO single grain bulk samples fabricated using the nanosize Y-211 powder, both in terms of trapped field and critical current density. The former reaches 553 mT at 77 K, with a ∼20% improvement compared to samples fabricated from commercial powders. Thus, our processing method is an effective source of pinning centers in single grain superconductors.

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Section: Resultssupporting

confidence: 54%

Section: Resultsmentioning

confidence: 78%

Synthesis of YBa₂Cu₃O_7−δ and Y₂BaCuO₅ Nanocrystalline Powders for YBCO Superconductors Using Carbon Nanotube Templates

et al. 2012

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“…Recently there have been many reports indicating that incorporating second-phase nanosized particles such as BaZrO 3 , BaSnO 3 , NbO 2 or defects enhances the pinning force for YBa 2 Cu 3 O 7−δ [10][11][12]. Jongprateep et al had reported that the addition of BaCeO 3 to YBCO results in an enhancement in the critical current density.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Vortex Pinning in YBa2Cu3O7−δ -BaHfO3 Superconductor-Insulator System

Rejith

Vidya

Thomas

et al. 2012

J Supercond Nov Magn

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A systematic study on phase evolution, bulk density, resistivity, critical transition temperature (T C ), critical current density (J C ) and in-field transport critical current density (J C -B) of pure and nano particles of BaHfO 3 added YBa 2 Cu 3 O 7−δ (YBCO) samples of different weight percentages has been carried out. The result shows a significant improvement in the electrical transport properties of the superconductor, namely the J C , J C -B characteristics and flux pinning force (F p ) of the BaHfO 3 added samples. The transition temperature also was found to increase marginally. A maximum transport J C of 742 A/cm 2 at 77 K (for x = 2 wt%) was observed for BaHfO 3 added samples against 147 A/cm 2 for pure YBCO sample. The enhancement of the critical current density in the YBCO-BaHfO 3 sample is attributed to the formation of an insulating and non-reacting YBa 2 HfO 5.5 phase, acting as artificial pinning centers in the matrix. The introduction of nano particles of BaHfO 3 in bulk YBCO increases the pinning force density from 30 × 10 3 N/m 3 to 424 × 10 3 N/m 3 at 77 K. The improvement in sintering density due to an optimum value 2 wt% BaHfO 3 addition in bulk YBCO indicates its potential use in electrical devices and technology. The enhancement in the superconducting properties, particularly in the J C -B characteristics due to BaHfO 3 addition, seems to have great technological significance.

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“…The bulk processing methods used have ranged from solid state reaction sintering, to melt texturing, to thermolysis. The work of Muralidhar et al [29], Yeoh et al [30], Abdullah and Tan [31], and Strukova et al [32] report examples of such studies and give references to relevant prior research. In virtually all cases, some improvement is seen in J c , particularly at higher magnetic fields, when the Nb is added.…”

Section: Perspective On Nb Addition To Mbcomentioning

confidence: 99%

Novel tri-modal defect structure in Nb-doped MOCVD Y Ba₂Cu₃O₇: a paradigm for pinning landscape control

Aytuğ¹,

Maroni²,

Miller³

et al. 2012

Supercond. Sci. Technol.

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Immobilization of vortices, or flux pinning, is both an enduring scientific issue and one of the most important problems in optimizing high temperature superconductors (HTSs) for commercial use. Here, we demonstrate a practical approach to the creation of a multi-modal flux pinning landscape in Y Ba2Cu3O7 (YBCO) films employing an industrially scalable metal–organic chemical vapor deposition technique. Through controlled additions of Nb, we have achieved a novel distribution of crystallographic defects that immobilize (pin) vortices in the YBCO matrix. That is, with only the addition of a single dopant element, a tri-modal, non-superconducting defect structure is induced that threads through the YBCO matrix laterally (parallel to the ab planes of YBCO), vertically (parallel to the YBCO c-axis), and isotropically in the form of random spherical defects. For optimally doped samples, the influence of these multi-modal nanocrystalline defect structures on the flux pinning properties manifests itself as a significant improvement in the critical current density (Jc) for all magnetic field orientations. The results demonstrate the possibility of achieving an ideal flux pinning landscape (from an orientation and strength viewpoint), which permits the design of HTS wires with fully-tunable properties by processes suitable for large-scale manufacturing.

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Improved Flux Pinning in Y–Ba–Cu–O Superconductors Containing Niobium Oxide

Cited by 6 publications

References 12 publications

Synthesis of YBa₂Cu₃O_7−δ and Y₂BaCuO₅ Nanocrystalline Powders for YBCO Superconductors Using Carbon Nanotube Templates

Synthesis of YBa₂Cu₃O_7−δ and Y₂BaCuO₅ Nanocrystalline Powders for YBCO Superconductors Using Carbon Nanotube Templates

Enhancement of Vortex Pinning in YBa2Cu3O7−δ -BaHfO3 Superconductor-Insulator System

Novel tri-modal defect structure in Nb-doped MOCVD Y Ba₂Cu₃O₇: a paradigm for pinning landscape control

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Improved Flux Pinning in Y–Ba–Cu–O Superconductors Containing Niobium Oxide

Cited by 6 publications

References 12 publications

Synthesis of YBa2Cu3O7−δ and Y2BaCuO5 Nanocrystalline Powders for YBCO Superconductors Using Carbon Nanotube Templates

Synthesis of YBa2Cu3O7−δ and Y2BaCuO5 Nanocrystalline Powders for YBCO Superconductors Using Carbon Nanotube Templates

Enhancement of Vortex Pinning in YBa2Cu3O7−δ -BaHfO3 Superconductor-Insulator System

Novel tri-modal defect structure in Nb-doped MOCVD Y Ba2Cu3O7: a paradigm for pinning landscape control

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Product

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Synthesis of YBa₂Cu₃O_7−δ and Y₂BaCuO₅ Nanocrystalline Powders for YBCO Superconductors Using Carbon Nanotube Templates

Synthesis of YBa₂Cu₃O_7−δ and Y₂BaCuO₅ Nanocrystalline Powders for YBCO Superconductors Using Carbon Nanotube Templates

Novel tri-modal defect structure in Nb-doped MOCVD Y Ba₂Cu₃O₇: a paradigm for pinning landscape control