Superconducting Properties of (M x /YBa2Cu3O7−δy )N Multilayer Films with Variable Layer Thickness x

Haugan, Timothy J.; Barnes, Paul N.; Campbell, T A; Pierce, Neal; Baca, F. J.; Locke, M.F.; Brockman, I.; Westerfield, A. L.; Evans, J. M.; Morgan, Raymond; Klenk, Paul; Harrison, Brandon; Chaney, Andrea; Maartense, I.

doi:10.1007/s11664-007-0229-y

Cited by 3 publications

(4 citation statements)

References 19 publications

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“…Multilayer and films were deposited by pulsed laser deposition (PLD), using parameters and conditions described in detail previously [11], [12], [17], [24]. Herein, for single-target films x will denote volume %.…”

Section: Methodsmentioning

confidence: 99%

“…The multilayer films were first optimized by varying the M layer thickness [17]. An optimal surface layer coverage corresponding to M phase 1 nm thickness was found to be necessary to increase compared to YBCO.…”

Section: Methodsmentioning

confidence: 99%

“…, Y211 0.8 nm, and [17]. Using the optimal M phase thickness, the YBCO layer was also systematically varied for multilayer films and optimized for maximum .…”

Section: Methodsmentioning

confidence: 99%

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Temperature and Magnetic Field Dependence of Critical Current Density of YBCO With Varying Flux Pinning Additions

Haugan

Baca

Mullins

et al. 2009

IEEE Trans. Appl. Supercond.

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The critical current density ( c ) of YBa 2 Cu 3 O 7 z films doped with varying flux pinning nanoparticle additions was systematically studied, for applied magnetic fields of = 0-9 T and operation temperatures T = 20-77 K. Films were prepared with pulsed laser deposition by (M YBCO) N multilayer or (YBCO) 1 x M x single-target methods, for different M phases including Y 2 O 3 , Y 2 BaCuO 5 (Y211) green-phase, and BaZrO 3 . Very significant differences of c ( c 20 77 K) were measured for optimized M phase additions, that are difficult to model or predict at present. Multilayer films with Y211 and Y 2 O 3 nanoparticle additions had the highest c (20 77 K) for 4 T, and YBCO+BZO-nanorod samples had the strongest c ( ) for 4 T and 65-77 K, however not for T 50 K.Seemingly unusual c ( T) properties were measured for (BZO YBCO) N multilayer films when compared to YBCO and other doped films; c ( ) was almost the same as YBCO at 77 K, however at 30 K c ( 2 T) had the strongest properties increasing 70% compared to YBCO+nanoaddition films and increasing 400% compared to YBCO.Index Terms-Critical current density, engineering current density, flux pinning, high temperature superconductor, nanoparticle, YBa 2 Cu 3 O 7 x .

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Temperature and Magnetic Field Dependence of Critical Current Density of YBCO With Varying Flux Pinning Additions

Haugan

Baca

Mullins

et al. 2009

IEEE Trans. Appl. Supercond.

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“…Although superconducting ReBa 2 Cu 3 O 7−δ (ReBCO) materials are highly anisotropic due to their intrinsic layered structures, the microstructure and flux pinning properties are significantly improved by artificially introducing multilayers of ReBCO with various second phase materials [1][2][3][4]. Particularly, multilayering of YBa 2 Cu 3 O 7−δ (YBCO) films on single crystal or metal substrates has successfully increased critical current densities, j c , and in-plane pinning forces, especially in high magnetic fields when compared to conventional undoped single layer YBCO films [5][6][7][8][9][10][11]. Therefore, multilayering gives the opportunity to increase the thickness of the film and therefore enhance the in-field current-carrying capability needed in high-power applications and in coated conductor technology [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Growth andc-axis flux pinning of nanostructured YBCO/BZO multilayers

Huhtinen¹,

Schlesier²,

Paturi³

2009

Supercond. Sci. Technol.

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A systematic investigation of superconducting multilayered films composed of alternating nanostructured YBa2Cu3O6+x (YBCO) and secondary phase BaZrO3 (BZO) layers is carried out. Detailed growth mechanism studies of these structures as well as superconducting properties in a wide temperature and magnetic field range are investigated by varying the thicknesses of layers grown by pulsed laser deposition. Structural analysis shows that multilayering changes clearly the growth mechanism of YBCO. Alternating thin BZO layers smoothen the film surface, create in-plane mosaic spread structure of the YBCO crystals, produce stress in the BZO interface region and moreover improve the out-of-plane alignment of YBCO. Magnetic measurements of superconducting properties demonstrate that the critical temperature decreases slightly when the thickness of the BZO layers increases relative to the YBCO layers. This indicates a growing strain effect at the layer interfaces. At the same time, critical current densities of multilayers in the whole used temperature and magnetic field range are increased to the same level as in conventionally BZO-doped YBCO films when very thin alternating YBCO/BZO layer structures are deposited. This thickness dependent result is explained by the dense flux pinning centre network in layered superconductors, giving the opportunity to increase the overall thickness of a film and further enhance the current-carrying capability.

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Optimizing Flux Pinning of <inline-formula> <tex-math notation="TeX">$\hbox{YBa}_{2}\hbox{Cu}_{3}\hbox{\rm O}_{7\hbox{-}{\delta}} $</tex-math></inline-formula> (YBCO) Thin Films With Unique Large Nanoparticle Size and High Concentration of <inline-formula> <tex-math notation="TeX">$\hbox{\rm Y}_{2}\hbox{BaCuO}_{5}$</tex-math></inline-formula> (Y211) Additions

Sebastian

Reichart

Ratcliff

et al. 2015

IEEE Trans. Appl. Supercond.

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Addition of second-phase nanosize defects to YBa₂Cu₃O₇ -δ (YBCO) superconductor thin films is known to enhance flux pinning and increase current densities (J c ). The addition of Y 2 BaCuO 5 (Y211) was studied previously in (Y211/YBCO) N multilayer structures, and in Y211+YBCO films deposited from pie-shaped targets. This research systematically studies the effect of Y211 addition in thin films deposited by pulsed laser deposition from YBCO 1-x Y211 x (x = 0 -15 vol. %) single targets, at temperatures of 785 -840 °C. Interestingly, the resulting size of Y211 particles is 20 to 40 nm, in contrast to 10 to 15 nm in previous studies of Y211 and 5-10 nm for other 2 ndphase defect additions; and the number density is reduced. A slight increase of J c (H,T) was achieved, compared to previous optimization studies. Results and comparisons of flux pinning, intrinsic stresses imaged by TEM, current densities, critical temperatures, and microstructures will be presented.The overall low intrinsic stress on YBCO from Y211 lattice mismatch is smaller than previously studied 2 nd -phase defect additions known, which is hypothesized to be the driving force in achieving the unusually large 2 nd -phase nanoparticle size and volume fraction thus-far in YBCO thin films.

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Superconducting Properties of (M x /YBa2Cu3O7−δy )N Multilayer Films with Variable Layer Thickness x

Cited by 3 publications

References 19 publications

Temperature and Magnetic Field Dependence of Critical Current Density of YBCO With Varying Flux Pinning Additions

Temperature and Magnetic Field Dependence of Critical Current Density of YBCO With Varying Flux Pinning Additions

Growth andc-axis flux pinning of nanostructured YBCO/BZO multilayers

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