Tb and Ce Doped Y123 Films Processed by Pulsed Laser Deposition

Kell, Joseph; Haugan, T. J.; Locke, M.F.; Barnes, Paul N.

doi:10.1109/tasc.2005.849415

Cited by 21 publications

(9 citation statements)

References 15 publications

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“…This implies that Ceria can enhance effective flux pinning only in very minute amounts (1 wt.%). A more detailed study is being performed to understand this issue, but it must be pointed out that similar trend has been recently reported by Barnes et al at Air Force Research Laboratory on samples prepared by PLD 14. …”

supporting

confidence: 69%

Solution-Based Approaches to Fabrication of YBa2Cu3O7−δ (YBCO): Precursors of Tri-Fluoroacetate (TFA) and Nanoparticle Colloids

Mukhopadhyay

Chintamaneni

2007

Journal of Elec Materi

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Detailed investigation of superconducting films of YBa 2 Cu 3 O 7-d (YBCO) prepared from solution-based precursors have been performed. Two precursors have been compared in this study: the presently used trifluoroacetate (TFA) solution and a recently developed colloidal suspension containing nanoparticles of mixed oxide. Detailed analyses of the evolution of microstructure and chemistry of the films have been performed, and process parameters have been correlated with final superconducting properties. Both films need two heating steps: a low temperature calcination and a higher temperature crystallization step. For TFA films, it was seen that the heating rate during calcination needs to be carefully optimized and is expected to be slow. For the alternate process using a nanoparticle precursor, a significantly faster calcination rate is possible. In the TFA process, the Ba ion remains as fluoride and the Y remains as oxyfluoride after calcination. This implies that, during the final crystallization stage to form YBCO, fluorine-containing gases will evolve, resulting in residual porosity. On the other hand, the film from the nanoparticle process is almost fully oxidized after calcination. Therefore, no gases evolve at the final firing (crystallization) stage, and the film has much lower porosity. The superconducting properties of both types of films are adequate, but the nanoparticle films appear to have persistently higher J c values. Moreover, they show improved flux pinning in higher magnetic fields, probably due to nanoscale precipitates of a Cu-rich phase. In addition, the nanocolloid films seem to show additionally enhanced flux pinning when doped with minute amounts of second phase precipitates. It therefore appears that, whereas the TFA process is already quite successful, the newly developed nanoparticle process has significant scope for additional improvement. It can be scaled-up with ease, and can be easily adapted to incorporate nanoscale flux pinning defects for in-field performance.

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confidence: 69%

Solution-Based Approaches to Fabrication of YBa2Cu3O7−δ (YBCO): Precursors of Tri-Fluoroacetate (TFA) and Nanoparticle Colloids

Mukhopadhyay

Chintamaneni

2007

Journal of Elec Materi

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“…Tc-onset temperatures of the films were attained from zerofield-cooled measurements. The measured magnetic data was used to determine the current densities by utilizing a simplified form or the Bean Critical State Model [7,8,9]. Transport current density measurements were conducted through collaboration with Dr. Judy Wu's research group at University of Kansas.…”

Section: Film Characterizationmentioning

confidence: 99%

Comparison study of the flux pinning enhancement of YBCO superconductor with BZO and BZO + Y₂O₃ mixed phase additions

Sebastian

Ebbing

Zhang

et al. 2017

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

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Abstract. Adding nanophase defects to YBa2Cu3O7-δ (YBCO) superconductor thin films is wellknown to enhance flux pinning, resulting in an increase in current density (Jct). While many previous studies focused on single phase additions, the addition of several phases simultaneously shows promise in improving current density by combining different pinning mechanisms. This paper compares the effect of the addition of two insulating, nonreactive phases of barium zirconium oxide (BZO) and yttrium oxide Y2O3, both as a single addition of BZO and as a double addition in conjunction with Y2O3. Processing parameters vary the target composition volume percent of BZO from 2-6 vol. %, while maintaining 3 vol. % Y2O3, and the remaining vol. % YBCO. Pulsed laser deposition produced thin films on LaAlO3 (LAO) and SrTiO3 (STO) substrates at various deposition temperatures. Comparison of strong and weak flux pinning mechanisms, current densities, critical temperatures, and microstructures of the resulting films will be presented. Films produced from the 2 vol. % BZO + 3 vol. Y2O3 doped YBCO target at a deposition temperature of 825 °C attained the highest current density. The addition of second phase Y2O3 impacted the film microstructure, resulting in more isotropic behavior when compared to the YBCO films doped with only BZO. . Liu utilized a 1.5 vol. % BZO and YBCO target to produce films on LAO decorated with Y2O3 nano-islands [5]. Optimization of film thickness for films consisting of YBCO with BZO and Y2O3 has also been studied, utilizing a 5 mol. % BZO and 5 mol. % Y2O3 target [6]. It is hypothesized that the combination of BZO and Y2O3 with YBCO influences the lattice strain in the film. This research seeks to explore the effects on current density of doping a YBCO target with 2, 4, and 6 volume percent BZO along with 3 vol. percent Y2O3, with the remaining volume percent YBCO.

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“…The nature of the pinning provided by the substitution could be due to the inclusion of nonsuperconducting particles in addition to or in lieu of strain induced improvements. Previous results obtained through Tb and Ce substitution in quantities ≤1% have shown some improvement of J c 7 . Pr has been noted in the literature as forming a REBCO phase that is non-metallic 8,9 .…”

Section: Pr Doped Ybco Films Produced By Pulsed Laser Depositionmentioning

confidence: 79%

“…Sm, Eu, Gd, etc) require concentrations of greater than 10% and even then often provide only modest improvements. To achieve the desired pinning while maintaining the small size of pinning center and the minute doping concentration, a RE, One possible method of achieving the desired J c (H) values is to incorporate well-dispersed, artificial, magnetic flux pinning centers into the YBCO lattice [2][3][4][5][6][7] . These pinning centers can consist of nonsuperconducting particulates [2][3][4] or secondary superconducting phases [5][6][7] .…”

Section: Methodsmentioning

confidence: 99%

Pr Doped YBCO Films Produced by Pulsed Laser Deposition

et al. 2006

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Pr doped YBa2Cu3O7-d targets with composition Y1-xPrxBa2Cu3O7-d where × = 0.0001, 0.001, 0.01, and 0.1 were prepared from oxide powders and were used to deposit thin films by pulsed laser deposition using conditions previously optimized for pure YBa2Cu3O7-d. The Pr dopant was found to be dispersed throughout the film by secondary ion mass spectrometry and found to have an increased density of nanoparticles on the surface. The pinning force of the doped samples was found to decrease with increasing concentration of Pr; however, at 0.01% concentration the doped film displayed a significant enhancement over pure YBa2Cu3O7-d for nearly the full range of 0 – 9 T.

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Tb and Ce Doped Y123 Films Processed by Pulsed Laser Deposition

Cited by 21 publications

References 15 publications

Solution-Based Approaches to Fabrication of YBa2Cu3O7−δ (YBCO): Precursors of Tri-Fluoroacetate (TFA) and Nanoparticle Colloids

Solution-Based Approaches to Fabrication of YBa2Cu3O7−δ (YBCO): Precursors of Tri-Fluoroacetate (TFA) and Nanoparticle Colloids

Comparison study of the flux pinning enhancement of YBCO superconductor with BZO and BZO + Y₂O₃ mixed phase additions

Pr Doped YBCO Films Produced by Pulsed Laser Deposition

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Tb and Ce Doped Y123 Films Processed by Pulsed Laser Deposition

Cited by 21 publications

References 15 publications

Solution-Based Approaches to Fabrication of YBa2Cu3O7−δ (YBCO): Precursors of Tri-Fluoroacetate (TFA) and Nanoparticle Colloids

Solution-Based Approaches to Fabrication of YBa2Cu3O7−δ (YBCO): Precursors of Tri-Fluoroacetate (TFA) and Nanoparticle Colloids

Comparison study of the flux pinning enhancement of YBCO superconductor with BZO and BZO + Y2O3 mixed phase additions

Pr Doped YBCO Films Produced by Pulsed Laser Deposition

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Comparison study of the flux pinning enhancement of YBCO superconductor with BZO and BZO + Y₂O₃ mixed phase additions