Development of a thick GdBCO and ZrO2-doped GdBCO film with a high critical current on a PLD-CeO2/IBAD-GZO metal substrate

Kinoshita, A.; Takahashi, Kazuhiro; Kobayashi, Hirokazu; Yamada, Yutaka; Ibi, A.; Fukushima, Hiroyuki; Konishi, M.; Miyata, S.; Shiohara, Yuh; Kato, Takumi; Hirayama, Tsukasa

doi:10.1016/j.physc.2007.01.045

Cited by 6 publications

(7 citation statements)

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“…The amount of the misoriented grains was determined by comparing the (102) peak intensities in and directions. All the films had -orientation percentage 3-4%, which is slightly higher than in CC [7], [8] and similar to or lower than in films fabricated on single crystal substrates [1], [17], [31], [32]. Normal twin structure was observed for undoped films from splitting of the (212) peak.…”

Section: A Structural Propertiesmentioning

confidence: 52%

“…Also, for GdBCO thin films and coated conductors (CC) a higher critical current density, , is reported in high magnetic fields at 77 K [1], [2], [4]- [6]. The angular dependence of was more isotropic for GdBCO than for YBCO and the volume of -oriented grains does not grow as much as in YBCO as film thickness increases [7], [8]. Moreover, a lower deposition Manuscript temperature, , and higher deposition rate were reported for GdBCO than for YBCO [2], [9].…”

Section: Introductionmentioning

confidence: 97%

“…Because crystal defects act as pinning sites, the increase of in GdBCO is connected to the observed high density of defects including stacking faults [2], [13], [14]. In addition, pinning can be enhanced by adding some artificial pinning sites such as gold nanorods [15], [16], Gd/Ba substitution [17] and adding non-superconducting impurities such as yttrium-stabilized zirconium [13] or (BZO) [7], [8]. BZO has been found to increase the dislocation concentration and it induces extended columnar linear defects in the films [18]- [20].…”

Section: Introductionmentioning

confidence: 99%

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Structural and Superconducting Properties of Undoped and BZO-doped GdBCO Thin Films

Schlesier

Huhtinen

Paturi

et al. 2009

IEEE Trans. Appl. Supercond.

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We report the effect of 4 wt% BZO-doping in GdBCO thin films on (100) STO substrates with novel nanograined target materials deposited by pulsed laser deposition (PLD) method. X-ray diffraction, atomic force microscopy and magnetization measurements, which were made in particularly wide temperature and magnetic field range, were used to determine the structural and superconducting properties. The results were compared with ones of YBCO. The deposition temperature, s , is not very critical for GdBCO and it is found to be much lower in undoped and BZO-doped GdBCO than in YBCO. The BZO-doping of GdBCO enhanced the field dependence of critical current density, c , at low temperatures. Furthermore, BZO-doping enhances the accommodation field, , below 60 K being clearly higher at 10 K in doped GdBCO than in YBCO. The pinning mechanism in GdBCO was concluded to be similar to that of YBCO. Our results clearly show that undoped and BZO-doped nanophase GdBCO is a very promising target material for applications as well as for coated conductors.

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Section: A Structural Propertiesmentioning

confidence: 52%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Structural and Superconducting Properties of Undoped and BZO-doped GdBCO Thin Films

Schlesier

Huhtinen

Paturi

et al. 2009

IEEE Trans. Appl. Supercond.

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“…While this process, BaZrO 3 (BZO) nano-rods are introduced into GdBCO matrix [6,7]. Substrate for the GdBCO film was the so-called Ion Beam Assisted Deposition (IBAD) substrate; PLD-CeO 2 / IBAD-Gd 2 Zr 2 O 7 /Hastelloy TM .…”

Section: Samplementioning

confidence: 99%

Current transport property in GdBCO coated conductor with artificial pinning centers in a wide range of temperature, magnetic field up to 27T, and field angle

Inoue

Fuger

Higashikawa

et al. 2010

Physica C: Superconductivity and its Applications

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“…The effective magnetic field scaling function for some conductors, particularly ReBCOcoated conductors, is not necessarily monotonously increasing with angle, but more importantly not fully determined by its values at 0 and 90 degrees [94,95,96,97]. It is no longer the component perpendicular to a grain that solely determines its J e , as pinning on stacking faults, [96], artificial pinning sites and 124-type intergrowths [98] can have significant influence on the anisotropy in J e .…”

Section: Three Cases Of Anisotropymentioning

confidence: 99%

High-temperature superconductors in high-field magnets

Weijers

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Preface and acknowledgementThis thesis deals with selected topics out of a wide research and development effort on HTS insert coil technology. Its origin goes back to the founding charter of the NHMFL in the year 1988 which listed the goal of realizing a 25 T superconducting magnet as one of the milestones the NHMFL was to achieve. High-temperature superconductors had only just been discovered and the required technology was non-existent. The path to where we are now has been eventful and a real learning experience. From the early days in the mid-1990-ies of the 'Wind and Pray" approach when coil testing relentlessly pointed out the shortcomings of both conductor and coil technologies at the time to the first successful "mini-coils" (around coil number 70) to the successive 1 T, 3 T and 5 T inserts (the latter reaching 25 T and bringing the total of numbered coils over 300 a decade later) to the promise of 30 + T superconducting user magnets with coated conductors in the not-toodistant future.Lacking the funds to buy the very expensive conductors, a collaboration was established with industry. This approach has served us well and resulted in a wide assortment of conductors to work with. New superconductors were donated in exchange for feedback on its performance as observed in our magnet technology development program. We also tested complete coils built by ourselves or by partners, in background magnetic field, a task for which the NHMFL facilities are well suited.This work is centered on the 5T insert coil for a total magnetic field of 25 T, but the research and development effort is interwoven with and inseparable from the broader HTS insert coil technology development program. Therefore discussions on a wider range of conductors and coils in line with the broader scope of this thesis are presented.While I take full responsibility for the described NHMFL insert coil designs, analysis and interpretation of the data on coils and conductors, having executed or been directly involved with all experiments described and having wound many a coil, this work has had the benefit of many direct and indirect contributions of a large number of people inside and outside the NHMFL. In contrast, developing this thesis itself has been the loneliest work I have ever done, but ultimately just as rewarding. There are many people that I would like to thank for their contributions to the HTS insert program in general and this thesis in particular.

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Development of a thick GdBCO and ZrO2-doped GdBCO film with a high critical current on a PLD-CeO2/IBAD-GZO metal substrate

Cited by 6 publications

References 11 publications

Structural and Superconducting Properties of Undoped and BZO-doped GdBCO Thin Films

Structural and Superconducting Properties of Undoped and BZO-doped GdBCO Thin Films

Current transport property in GdBCO coated conductor with artificial pinning centers in a wide range of temperature, magnetic field up to 27T, and field angle

High-temperature superconductors in high-field magnets

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