Journal ArticleDOI
Flux-pinning characteristics as a function of density of columnar defects comprised of self-assembled nanodots and nanorods in epitaxial YBa2Cu3O7−δ films for coated conductor applications
S. Kang,Amit Goyal,Jing Li,Patrick M Martin,Anota O Ijaduola,James R. Thompson,Mariappan Parans Paranthaman +6 more
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TLDR
In this article, columnar defects in YBa 2 Cu 3 O 7− δ (YBCO) and YBCO films with extended columnar defect comprised of self-assembled columns of nanodots and nanorods of BaZrO 3 (BZO), CZO and 8.5% Y 2 O 3 stabilized ZrO 2 (YSZ).Abstract:
Pure YBa 2 Cu 3 O 7− δ (YBCO) and YBCO films with extended columnar defects comprised of self-assembled columns of nanodots and nanorods of BaZrO 3 (BZO), CaZrO 3 (CZO) and 8 mol.% Y 2 O 3 stabilized ZrO 2 (YSZ) were prepared by pulsed laser deposition on RABiTS templates of configuration CeO 2 /YSZ/Y 2 O 3 /Ni–W. Effects on increasing the size and density of columnar defects by varying the total volume fraction BZO, CZO or YSZ incorporations within the YBCO film are reported. BZO volume fraction was varied between 0% and 8%, CZO between 0% and 2% and YSZ 0–2%. The critical transition temperature ( T c ) was found to linearly decrease with increase in vol.% of BZO, CZO and YSZ, with the steepest decline for CZO additions. Nevertheless, YBCO films with these columnar defects exhibit significantly reduced J c dependence on applied field. At 77 K, best properties are obtained for 1–2 vol.% BZO incorporation in the form of columns of self-assembled nanodots and nanorods in fields of 0.1–1.5 T.read more
Citations
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Preparation of Regular Arrays of Antidots in YBCO Thin Films and Observation of Vortex Lattice Matching Effects
TL;DR: In this paper, the existence of multiquanta vortices confined by the holes in YBa2Cu3O7 (YBCO) thin films on CeO2-buffered sapphire substrates is considered.
Journal ArticleDOI
Thick YBa2Cu3O7−x+BaSnO3 films with enhanced critical current density at high magnetic fields
TL;DR: In this article, the thickness dependence of YBa2Cu3O7−x(YBCO)+BaSnO3 (BSO) nanocomposite films was studied.
Journal ArticleDOI
Engineering nanocolumnar defect configurations for optimized vortex pinning in high temperature superconducting nanocomposite wires
TL;DR: In this article, the authors report microstructural design via control of BaZrO3 defect density in high temperature superconducting (HTS) wires based on epitaxial YBa2Cu3O7-δ (YBCO) films to achieve the highest critical current density, Jc, at different fields, H.
Journal ArticleDOI
Practical fit functions for transport critical current versus field magnitude and angle data from (RE)BCO coated conductors at fixed low temperatures and in high magnetic fields
TL;DR: In this article, a nonlinear fit of the transport critical current at T = 4.2 K versus field and angle data was proposed to estimate the hysteresis losses of (RE)BCO coated conductors in high magnetic fields, and to design the inserts wound with such conductors of the all-superconducting 32 T magnet being constructed at the NHMFL.
Journal ArticleDOI
Enhanced flux pinning in MOCVD-YBCO films through Zr additions : systematic feasibility studies.
Tolga Aytug,Mariappan Parans Paranthaman,Eliot D. Specht,Yanwen Zhang,Kyunghoon Kim,Yuri L. Zuev,Claudia Cantoni,Amit Goyal,David K. Christen,Victor A. Maroni,Y Chen,Venkat Selvamanickam +11 more
TL;DR: In this paper, the structural and flux pinning properties of YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} (YBCO) films deposited by metal-organic chemical vapor deposition (MOCVD) have been investigated.
References
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Journal ArticleDOI
Strongly enhanced current densities in superconducting coated conductors of YBa2Cu3O7-x + BaZrO3
Judith L. MacManus-Driscoll,Judith L. MacManus-Driscoll,Stephen R. Foltyn,Quanxi Jia,Haiyan Wang,Adriana Serquis,Leonardo Civale,Boris Maiorov,Marilyn E. Hawley,M. P. Maley,Dean E. Peterson +10 more
TL;DR: This work demonstrates a simple and industrially scaleable route that yields a 1.5–5-fold improvement in the in-magnetic-field current densities of conductors that are already of high quality.
Journal ArticleDOI
Vortex confinement by columnar defects in YBa2Cu3O7 crystals: Enhanced pinning at high fields and temperatures.
L. Civale,A. D. Marwick,Thomas K. Worthington,M. A. Kirk,James R Thompson,Lia Krusin-Elbaum,Yang Ren Sun,John R. Clem,F. Holtzberg +8 more
TL;DR: A microstructure is realized which leads to very strong high-temperature flux pinning in YBa and Cu crystals, and causes a considerable enlargement of the irreversibility region in the H-T plane.
Journal ArticleDOI
Addition of nanoparticle dispersions to enhance flux pinning of the YBa2Cu3O7-x superconductor
TL;DR: A method for achieving a dispersion of ∼8-nm-sized nanoparticles in YBCO with a high number density, which increases the critical current by a factor of two to three for high magnetic fields.
Journal ArticleDOI
Irradiation-free, columnar defects comprised of self-assembled nanodots and nanorods resulting in strongly enhanced flux-pinning in YBa2Cu3O7−δ films
Amit Goyal,S. Kang,Keith J. Leonard,Patrick M Martin,Albert A. Gapud,Maria Varela,Mariappan Parans Paranthaman,A.O. Ijaduola,Eliot D. Specht,James R Thompson,James R Thompson,David K. Christen,Stephen J. Pennycook,F.A. List +13 more
TL;DR: In this paper, a simple and practically scalable technique was used to produce long, nearly continuous vortex pins along the c-axis in YBa2Cu3O7?? (YBCO), in the form of self-assembled stacks of BaZrO3 (BZO) nanodots and nanorods.
Journal ArticleDOI
Composite flux-line lattices stabilized in superconducting films by a regular array of artificial defects.
TL;DR: The ``metallic'' behavior of the flux lines at the interstices at temperatures close to the critical temperature leads to a first-order phase transition analogous to the Mott insulator-metal transition for flux lines, introduced by Nelson and Vinokur.
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