Vortex pinning properties in Co-doped BaFe2As2thin films with a high critical current density over 2 MA cm−2at 9 T

Yuan, Pusheng; Xu, Zhaojun; Wang, Dongliang; Zhang, Ming; Li, Jianqi; Ma, Yanwei

doi:10.1088/0953-2048/30/2/025001

Cited by 32 publications

(37 citation statements)

References 44 publications

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“…The high-quality Ba122:Co film grown at the optimal pulse energy (i.e., the optimum deposition rate) exhibited high J c over 1 MA/cm 2 irrespective of the laser wavelength. The estimated optimum excitation energy density for KrF was 6.7-10 J/cm 2 , which is substantially higher than that of second harmonics ( has been greatly improved in Ba122:Co films [ 147 ]. In addition to naturally formed external pinning centers, some intentional approaches for realizing a high pinning force and isotropic properties were also examined such as proton irradiation [ 157 ], oxygen impurity concentration tuning [ 156,158 ], and the use of undoped Ba122/Ba122:Co modulated superlattices [ 159 ].…”

Section: Thin Filmsmentioning

confidence: 85%

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Recent advances in iron-based superconductors toward applications

et al. 2018

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Iron with a large magnetic moment was widely believed to be harmful to the emergence of superconductivity because of the competition between the static ordering of electron spins and the dynamic formation of electron pairs (Cooper pairs). Thus, the discovery of a high critical temperature (Tc) iron-based superconductor (IBSC) in 2008 was accepted with surprise in the condensed matter community and rekindled extensive study globally. IBSCs have since grown to become a new class of high-Tc superconductors next to the high-Tc cuprates discovered in 1986. The rapid research progress in the science and technology of IBSCs over the past decade has resulted in the accumulation of a vast amount of knowledge on IBSC materials, mechanisms, properties, and applications with the publication of more than several tens of thousands of papers. This article reviews recent progress in the technical applications (bulk magnets, thin films, and wires) of IBSCs in addition to their fundamental material characteristics. Highlights of their applications include high-field bulk magnets workable at 15-25 K, thin films with high critical current density (Jc) > 1 MA/cm2 at ~10 T and 4 K, and an average Jc of 1.3*104 A/cm2 at 10 T and 4 K achieved for a 100-m-class-length wire. These achievements are based on the intrinsically advantageous properties of IBSCs such as the higher crystallographic symmetry of the superconducting phase, higher critical magnetic field, and larger critical grain boundary angle to maintain high Jc. These properties also make IBSCs promising for applications using high magnetic fields.Comment: Published online in Materials Today. Open Acces

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Section: Thin Filmsmentioning

confidence: 85%

“…The in-field properties of Ba122:Co in the early stage in 2010-2012 were not promising.However, the in-field J c performance of Ba122:P is generally superior to that of Ba122:Co mainly because of its high T c and effective vortex pinning. Recently, a high-J c Ba122:Co film with isotropic J c was demonstrated on CaF 2 substrates[ 147 ].…”

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Recent advances in iron-based superconductors toward applications

et al. 2018

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“…13,14 As in the case of YBCO, Jc has been enhanced particularly for AEFe2As2-based (AE: alkaline-earth element) superconductors, the so-called 122 materials, by particle irradiation, 15 addition of BaZrO3, 16,17 fabrication of superlattices, 18 and introduction of stacking faults. 19,20 By devising the fabrication process, a significant progress has been achieved in improving Jc of bulks and thin films so far, while further Jc enhancement is required towards real-life applications.…”

Section: Introductionmentioning

confidence: 99%

Unique defect structure and advantageous vortex pinning properties in superconducting CaKFe4As4

et al. 2019

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The lossless current-carrying capacity of a superconductor is limited by its critical current density (Jc). A key to enhance Jc towards real-life applications is engineering defect structures to optimize the pinning landscape. For iron-based superconductors (IBSs) considered as candidate materials for high-field applications, high Jc values have been achieved by various techniques to introduce artificial pinning centres. Here we report extraordinary vortex pinning properties in CaKFe4As4 (CaK1144) arising from the inherent defect structure. Scanning transmission electron microscopy revealed the existence of nanoscale intergrowths of the CaFe2As2 phase, which is unique to CaK1144 formed as a line compound. The Jc properties in CaK1144 are found to be distinct from other IBSs characterized by a significant anisotropy with respect to the magnetic field orientation as well as a remarkable pinning mechanism significantly enhanced with increasing temperature. We propose a comprehensive explanation of the Jc properties based on the unique intergrowths acting as pinning centres.

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“…These substrates were chosen and tried to prepare high quality ultra-thin Ba122:Co films by PLD. The details of the growth conditions were reported in our previous work [24].The substrates were cleaned in an ultrasonic bath by using alcohol and acetone for 5 min, respectively, and then the clean substrate was glued onto a stainless steel sample holder by silver paint. The laser (KrF 248 nm) energy was chosen to be 310-320 mJ per pulse with repetition rate of 9 Hz and the distance between substrate and target was kept fixed at 40 mm.…”

Section: Methodsmentioning

confidence: 99%

Transport properties of ultrathin BaFe_1.84Co_0.16As₂superconducting nanowires

Yuan

et al. 2017

Supercond. Sci. Technol.

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Superconducting nanowire single-photon detectors (SNSPDs) have an absolute advantage over other types of single photon detectors except the low operating temperature.Therefore, many efforts have been devoted to find high-temperature superconducting materials that are suitable for preparing SNSPDs. Copper-based and MgB2 ultra-thin superconducting nanowires have been already reported. However, the transport properties of iron-based ultra-thin superconducting nanowires have not been studied. In this work, a 10 nm thick × 200 nm wide × 30 μm long high quality superconducting nanowire was fabricated from ultrathin BaFe1.84Co0.16As2 films by a lift-off process. The precursor BaFe1.84Co0.16As2 film with a thickness of 10 nm and root-mean-square roughness of 1 nm was grown on CaF2 substrates by pulsed laser deposition. The nanowire shows a high superconducting critical temperature T zero c =20 K with a narrow transition width of ΔT=2.5 K and exhibits a high critical current density Jc of 1.8×10 7 A cm −2 at 10 K. These results of ultrathin BaFe1.84Co0.16As2nanowire will attract interest in electronic applications, including SNSPDs.

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Vortex pinning properties in Co-doped BaFe₂As₂thin films with a high critical current density over 2 MA cm⁻²at 9 T

Cited by 32 publications

References 44 publications

Recent advances in iron-based superconductors toward applications

Recent advances in iron-based superconductors toward applications

Unique defect structure and advantageous vortex pinning properties in superconducting CaKFe4As4

Transport properties of ultrathin BaFe_1.84Co_0.16As₂superconducting nanowires

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Vortex pinning properties in Co-doped BaFe2As2thin films with a high critical current density over 2 MA cm−2at 9 T

Cited by 32 publications

References 44 publications

Recent advances in iron-based superconductors toward applications

Recent advances in iron-based superconductors toward applications

Unique defect structure and advantageous vortex pinning properties in superconducting CaKFe4As4

Transport properties of ultrathin BaFe1.84Co0.16As2superconducting nanowires

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Product

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Vortex pinning properties in Co-doped BaFe₂As₂thin films with a high critical current density over 2 MA cm⁻²at 9 T

Transport properties of ultrathin BaFe_1.84Co_0.16As₂superconducting nanowires