Eliminating thickness dependence of critical current density in YBa2Cu3O7−x films with aligned BaZrO3 nanorods

Wang, Xiang; Baca, F. J.; Emergo, R. L. S.; Wu, Judy; Haugan, Timothy J.; Barnes, Paul N.

doi:10.1063/1.3512988

Cited by 41 publications

(23 citation statements)

References 20 publications

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“…It has been established that long continuous and small diameter BZO nanorods that permeate the whole film contribute to strong pinning and high lift factor in critical current 12–14,16,23 . Such dependence of in-field behavior on nanorod morphology has also been reported in 27 . The in-plane texture of the film appears very sharp as can be seen in the diffraction pattern, indicating a good balance between high lift factor and I c at 77 K, 0T.…”

Section: Resultssupporting

confidence: 73%

Over 15 MA/cm2 of critical current density in 4.8 µm thick, Zr-doped (Gd,Y)Ba2Cu3Ox superconductor at 30 K, 3T

Majkic

Pratap

et al. 2018

Sci Rep

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An Advanced MOCVD (A-MOCVD) reactor was used to deposit 4.8 µm thick (Gd,Y)BaCuO tapes with 15 mol% Zr addition in a single pass. A record-high critical current density (Jc) of 15.11 MA/cm2 has been measured over a bridge at 30 K, 3T, corresponding to an equivalent (Ic) value of 8705 A/12 mm width. This corresponds to a lift factor in critical current of ~11 which is the highest ever reported to the best of author’s knowledge. The measured critical current densities at 3T (B||c) and 30, 40 and 50 K, respectively, are 15.11, 9.70 and 6.26 MA/cm2, corresponding to equivalent Ic values of 8705, 5586 and 3606 A/12 mm and engineering current densities (Je) of 7068, 4535 and 2928 A/mm2. The engineering current density (Je) at 40 K, 3T is 7 times higher than that of the commercial HTS tapes available with 7.5 mol% Zr addition. Such record-high performance in thick films (>1 µm) is a clear demonstration that growing thick REBCO films with high critical current density (Jc) is possible, contrary to the usual findings of strong Jc degradation with film thickness. This achievement was possible due to a combination of strong temperature control and uniform laminar flow achieved in the A-MOCVD system, coupled with optimization of BaZrO3 nanorod growth parameters.

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Section: Resultssupporting

confidence: 73%

Over 15 MA/cm2 of critical current density in 4.8 µm thick, Zr-doped (Gd,Y)Ba2Cu3Ox superconductor at 30 K, 3T

Majkic

Pratap

et al. 2018

Sci Rep

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“…6b, the n-YBCO + BZO has huge dips along the ab -plane in a 2 T field but small ab -peak seems to arise at 6 T. The absence of ab -peaks at 2 T could be related to the high density of elongated and well-ordered, largely c -axis oriented nanorods, which worsen the ab -plane pinning but improve the c -axis pinning in such a way that a broad and immensely strong c -peak occurs. This would also suppress the ab -peak from arising in its usual direction 32 . At 6 T, the c -axis pinning weakens which not only narrows the c -peak but also allows the small ab -peaks to appear.…”

Section: Resultsmentioning

confidence: 99%

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

Khan

Rivasto

Tikkanen

et al. 2019

Sci Rep

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Striving to improve the critical current density Jc of superconducting YBa2Cu3O6+x (YBCO) thin films via enhanced vortex pinning, the interplay between film growth mechanisms and the formation of nanosized defects, both natural and artificial, is systematically studied in undoped and BaZrO3 (BZO)-doped YBCO thin films. The films were grown via pulsed laser deposition (PLD), varying the crystal grain size of the targets in addition to the dopant content. The microstructure of the PLD target has been observed to have a great impact on that of the deposited thin films, including the formation of vortex pinning centers, which has direct implications on the superconducting performance, especially on the isotropy of flux pinning properties. Based on experimentally measured angular dependencies of Jc, coupled with a molecular dynamics (MD) simulation of flux pinning in the YBCO films, we present a quantitative model of how the splay and fragmentation of BZO nanorods artifically introduced into the YBCO film matrix explain the majority of the observed critical current anisotropy.

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“…While the Bmax is similar in the 2% doped films, the enhanced Bmax ~ 8.0 T along B//c in the 6% ML sample is 60% more than that of the 6% SL sample. Furthermore, the enhanced Fpmax ~ 158 GN/m 3 in the 6% ML sample (which is more than 4 times that of the 6% SL sample) is the best reported so far in BZO 1D-APC/YBCO nanocomposites films [5,17,[42][43][44][45]. Figure 3f indicates that, similar to the 2% ML, pinning benefits in the 6% ML extends well beyond B//c and up to ~ 67 o .…”

Section: Resultsmentioning

confidence: 51%

“…The details of the patterning and sample wiring for the transport measurement can be found in our previous works. [25,26] The samples were mounted on a oxygen-free Cu stage using Ag paste and resistance-temperature (R-T) and current-voltage (I-V) characteristic curves were measured as function of temperature T (65K-77 K) and the magnetic field B (up to 9.0 T) applied in the c-axis of the BZO/YBCO films in a Quantum Design Ever-Cool II Physical Property Measurement System (PPMS). To minimize the heating at high currents, a pulsed current source (Keithley 2430 1KW Pulse Source Meter) was adopted with the pulse width of ~ 500 ms for the I-V curves.…”

Section: Methodsmentioning

confidence: 99%

Interface Engineering for Enhanced Magnetic Vortex Pinning by 1D-BZO APCs in a Wide Angular Range

Ogunjimi

Sebastian

Zhang

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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Microstructural analysis of the BaZrO3 (BZO)/YBa2Cu3O7 (YBCO) interface has revealed a highly defective and oxygen deficient 2-3 nm thick YBCO column surrounding the BZO one-dimensional artificial pinning centers (1D-APCs). The resulting semi-coherent interface is the consequence of the ∼7.7% BZO/YBCO lattice mismatch and is responsible for the low pinning efficiency of BZO 1D-APCs. Herein, we report an interface engineering approach of dynamic Ca/Cu replacement on YBCO lattice to reduce/eliminate the BZO/YBCO lattice mismatch for improved pinning at a wide angular range of the magnetic field orientation. The Ca/Cu replacement induces a local elongation of the YBCO c-lattice near the BZO/YBCO interface, thereby ensuring a reduction in the BZO/YBCO lattice mismatch to ∼1.4% and a coherent BZO/YBCO interface. This has resulted in enhanced pinning at B//c-axis and a broad angular range of B-field orientation. For example, the 6 vol.% BZO/YBCO film with interface engineering exhibits F p ∼158 GN/m3 at 65 K and B//c-axis, which is 440% higher than the ∼36.1 GN/m3 for the reference 6% BZO/YBCO sample, and enhanced Jc and F p in a wide angular range up to ∼ 80°. This result illustrates a facile scheme for engineering 1D-APC/YBCO interface to resume the pristine pinning efficiency of the 1D-APCs.

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Eliminating thickness dependence of critical current density in YBa2Cu3O7−x films with aligned BaZrO3 nanorods

Cited by 41 publications

References 20 publications

Over 15 MA/cm2 of critical current density in 4.8 µm thick, Zr-doped (Gd,Y)Ba2Cu3Ox superconductor at 30 K, 3T

Over 15 MA/cm2 of critical current density in 4.8 µm thick, Zr-doped (Gd,Y)Ba2Cu3Ox superconductor at 30 K, 3T

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

Interface Engineering for Enhanced Magnetic Vortex Pinning by 1D-BZO APCs in a Wide Angular Range

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