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IEEE transactions on applied superconductivity : a... 147건

  1. [해외논문]   Microwave Measurements of Pinning Properties in Chemically Deposited YBCO/BZO Films   SCI SCIE

    Torokhtii, Kostiantyn , Pompeo, Nicola , Frolova, Anna , Pinto, Valentina , Armenio, Achille Angrisani , Piperno, Laura , Celentano, Giuseppe , Petrisor, Traian , Ciontea, Lelia , Mos, Ramona B. , Nasui, Mircea , Sotgiu, Giovanni , Silva, Enrico
    IEEE transactions on applied superconductivity : a publication of the IEEE Superconductivity Committee v.27 no.4 pt.3 ,pp. 1 - 5 , 2017 , 1051-8223 ,

    초록

    We present a comparative study of vortex pinning in chemically deposited YBa 2 Cu 3 O 7-x /BaZrO 3 nanocomposite films, with the aim of correlating the preparation method to the superconducting properties. Two sets of samples have been prepared by different low fluorine routes (one set followed the in situ approach), with different starting YBCO coating solution and with a different amount of BaZrO 3 . The short-range vortex pinning properties have been assessed using a contactless microwave (48 GHz) technique, which yielded the vortex pinning constant (Labusch parameter) k p and the vortex viscosity θ as a function of the applied field up to 0.8 T, and for temperatures between 60 K and T c . The results were compared to more usual (long-range vortex motion) J c measurements. Despite the supposed similarity in pinning as determined from J c , we found significant differences between the pinning properties of the two sets of samples. It appears that the in situ approach results in stronger pinning at microwaves in the whole temperature range explored, and that this behavior is due to the smaller dimensions of BaZrO 3 nanoparticles. This information can be very useful in the search of optimized chemical route to strong pinning superconducting nanocomposite materials.

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  2. [해외논문]   Enhanced Flux Pinning Properties of YBCO Thin Films With Various Pinning Landscapes   SCI SCIE

    Jijie Huang , Leigang Li , Xuejing Wang , Zhimin Qi , Sebastian, Mary Ann P. , Haugan, Timothy J. , Haiyan Wang
    IEEE transactions on applied superconductivity : a publication of the IEEE Superconductivity Committee v.27 no.4 pt.3 ,pp. 1 - 5 , 2017 , 1051-8223 ,

    초록

    Pinning enhancement for YBa 2 Cu 3 O 7-δ (YBCO) thin films is critical for their future applications such as superconducting cables, generators, and motors. In this study, several pinning landscapes are introduced and compared for improving the superconducting properties of YBCO thin films. First, BaZrO 3 (BZO) nanoparticles have been doped into YBCO matrix providing uniform defect pinning centers and resulting in the superconducting property enhancement. Second, a magnetic nanocomposite of (La 0.7 Sr 0.3 MnO 3 (LSMO)) x (CeO 2 ) 1-x (with compositions of LSMO and CeO 2 varied from 50:50 to 70:30) has been incorporated into YBCO as either a cap layer or a buffer layer. Using this approach, both magnetic pinning and defects pinning are introduced in the systems. Third, multilayers of (LSMO) 0.5 (CeO 2 ) 0.5 /YBCO have been deposited to achieve uniform defect and magnetic pinning effects through the film thickness. The superconducting properties (critical temperature T c , and especially the critical current density J c ) are compared for all the YBCO films with different pinning landscapes, and the corresponding pinning mechanisms are also discussed for each case. It is found that the pinning effect of YBCO film with magnetic nanocomposite layer is more significant under lower applied field, compared to the BZO-YBCO film. Through this comparison study, optimum pinning landscapes with combined defects and magnetic pinning approaches are proposed.

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  3. [해외논문]   Properties of Multifilamentary MgB2 Wires Fabricated by Internal Magnesium Diffusion Using Amorphous and Crystalline Boron Powders   SCI SCIE

    Da Xu , Dongliang Wang , Chao Yao , Xianping Zhang , Yanwei Ma , Awaji, Satoshi , Watanabe, Kazuo
    IEEE transactions on applied superconductivity : a publication of the IEEE Superconductivity Committee v.27 no.4 pt.3 ,pp. 1 - 4 , 2017 , 1051-8223 ,

    초록

    MgB 2 /Nb/Monel multifilamentary wires were fabricated using amorphous and crystalline boron powders by an internal Mg diffusion (IMD) process. The microstructure, morphology, and the critical current density (J c ) of the reacted MgB 2 layers in the multifilamentary wires made using different boron powders were analyzed and compared. The purity of boron powder influences greatly the transport properties of MgB 2 wires. The J c as high as 6.1 × 10 4 A cm -2 at 4.2 K, 10 T is obtained in the seven-core MgB 2 wire made using amorphous boron powder. The IMD-processed seven-core MgB 2 wire fabricated using high-purity crystalline boron powder has also a high J c of 4.9 × 10 4 A cm -2 at 4.2 K and 10 T. However, the seven-core MgB 2 wire prepared using low-purity crystalline boron powder has a relatively low J c compared with the others, which is expected to allow the fabrication of large-scale and low-cost superconducting wires for practical application. The further improvement of layer J c , nonbarrier J c and engineering critical current density J e is necessary because of the irregular subfilaments and the inhomogeneous thickness of the reacted MgB 2 layer in multifilamentary wires.

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  4. [해외논문]   Effect of Pt and CeO2 on Growth of Y-123/nano-Y2O3 Single Grain Superconductors   SCI SCIE

    Zhi-Wei Zhang , Yunhua Shi , Wei Zhai , Dennis, A. R. , Cardwell, David A.
    IEEE transactions on applied superconductivity : a publication of the IEEE Superconductivity Committee v.27 no.4 pt.3 ,pp. 1 - 4 , 2017 , 1051-8223 ,

    초록

    The top seeded melt growth (TSMG) process is used widely to grow single grain, bulk superconductors for high field engineering applications. Within the TSMG process, the flux pinning ability of a single-grain bulk superconductor can be improved effectively by reducing the size of starting precursor powders prior to melt processing. This paper investigates the preparation of Y-123/nano-Y 2 O 3 single-grain samples based on TSMG process. A large number of microcracks and significant inhomogeneity were found in samples containing Pt and CeO 2 additives, respectfully. This reduces the performance of samples made from nano Y 2 O 3 starring powders. A pretreatment of the starting powders was developed to decrease microcracks and improve the homogeneity of Y-123/nano-Y 2 O 3 single grain samples. The influence of Pt and CeO 2 doping on the superconducting properties of the fully processed single grain were also investigated in detail. The Y-123/nano-Y 2 O 3 based samples exhibit features that are rarely seen in conventional YBCO single grain, bulk superconductors.

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  5. [해외논문]   Epitaxial Growth of CeO2 Buffer Layers on IBAD-Textured MgO Templates by Pulsed Laser Deposition   SCI SCIE

    Kyung-Pil Ko , Soon-Mi Choi , Won-Jae Oh , Insung Park , Seung-Hyun Moon , Sang-Im Yoo
    IEEE transactions on applied superconductivity : a publication of the IEEE Superconductivity Committee v.27 no.4 pt.3 ,pp. 1 - 5 , 2017 , 1051-8223 ,

    초록

    Epitaxial growth of CeO 2 buffer layers on the ion-beam assisted deposition (IBAD)-textured MgO templates could be successfully achieved by an annealing heat treatment prior to CeO 2 deposition by pulsed laser deposition (PLD). The annealing process was performed in a tube furnace (ex-situ annealing) or in a PLD chamber (in-situ annealing). Analyses by x-ray photoelectron spectroscopy on the surface of ex-situ annealed MgO single crystals revealed that Mg(OH) 2 formed on the MgO surface in air was gradually decomposed into MgO with increasing annealing temperature and period. The CeO 2 layer on the IBAD MgO template ex-situ annealed for 6 h at 750 °C was only c-axis oriented in comparison with that on the nonannealed IBAD MgO template. However, some 45°-rotated grains were observed in the CeO 2 layer on ex-situ annealed IBAD MgO template. In contrast, in-situ annealing for 1 h at 800 °C was found effective to grow CeO 2 layer with a cube-on-cube orientation, suggesting that Mg(OH) 2 and MgCO 3 phases on the MgO surface were fully decomposed into MgO phase with (001) (a//[100]) orientation. TEM analyses supported that a high degree of biaxial alignment of CeO 2 layer was deposited on in-situ annealed IBAD MgO template.

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  6. [해외논문]   Numerical Simulation of Nanorod Growth in REBa2Cu3Oy Superconducting Thin Films   SCI SCIE

    Ichino, Yusuke , Yoshida, Yutaka
    IEEE transactions on applied superconductivity : a publication of the IEEE Superconductivity Committee v.27 no.4 pt.3 ,pp. 1 - 4 , 2017 , 1051-8223 ,

    초록

    Various nanostructures consisting of BaMO 3 (BMO) self-organize in REBa 2 Cu 3 Oy (REBCO) films prepared by vapor phase epitaxy. A numerical simulation of the BMO self-organization was developed using the three-dimensional Monte Carlo (3D-MC) method, and the effects of deposition parameters such as substrate temperature (T s ), deposition rate (v dep ), and BMO volume fraction (f BMO ) on BMO self-organization were investigated. We consider only the kinetic factors and ignore mismatch strain on the nanorods (NRs) morphology. 3D-MC simulations for various T s indicated that the number density of BMO NRs decreased with an increase in T s , and this tendency was similar to previous experimental results for BaHfO 3 -doped SmBCO films prepared by the pulsed laser deposition method. The effects of v dep and f BMO were also simulated to provide contour plots of the number density of NRs with respect to T s and f BMO at various v dep . Phase diagrams of nanostructures consisting of BMO with various v dep were also obtained. Although these results do not take into account degradation of the superconducting properties and crystalline defects induced by nonoptimized conditions, they are considered to be a useful guideline for control of the flux pinning landscape on REBCO-coated conductors.

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  7. [해외논문]   Properties of Fe(Se, Te) Bicrystal Grain Boundary Junctions, SQUIDs, and Nanostrips   SCI SCIE

    Sarnelli, Ettore , Nappi, Ciro , Camerlingo, Carlo , Enrico, Emanuele , Bellingeri, Emilio , Kawale, Shrikant , Braccini, Valeria , Leveratto, Alessandro , Ferdeghini, Carlo
    IEEE transactions on applied superconductivity : a publication of the IEEE Superconductivity Committee v.27 no.4 pt.3 ,pp. 1 - 4 , 2017 , 1051-8223 ,

    초록

    We have fabricated and characterized single junctions, dc Superconducting Quantum Interference Devices (SQUIDs), and nanostrips made by Fe(Te, Se) superconductive thin films. SrTiO 3 bicrystal substrates with different misorientation angles have been used for the fabrication of Josephson junctions and SQUIDs. Nanostrips have been realized growing thin films on CaF 2 substrates. The interaction between fluxons and antifluxons has been taken into account for the evaluation of the pinning energy values.

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  8. [해외논문]   A Study on Electrical Characteristics of Multilayered Metallic-Insulation Coils   SCI SCIE

    Dong Gyu Yang (Dept. of Mater. Sci. & Eng., Korea Univ., Seoul, South Korea ) , Jung-Bin Song (Dept. of Mater. Sci. & Eng., Korea Univ., Seoul, South Korea ) , Yoon Hyuck Choi (Dept. of Mater. Sci. & Eng., Korea Univ., Seoul, South Korea ) , Seong-Gyeom Kim (Dept. of Mater. Sci. & Eng., Korea Univ., Seoul, South Korea ) , Yeon Suk Choi (Korea Basic Sci. Inst., Daejeon, South Korea) , Haigun Lee
    IEEE transactions on applied superconductivity : a publication of the IEEE Superconductivity Committee v.27 no.4 pt.3 ,pp. 1 - 6 , 2017 , 1051-8223 ,

    초록

    This paper presents results, both experimental and analytical, on the electrical characteristics of GdBCO singlepancake coils co-wound with a number of copper tapes as metallic insulation [multilayered metallic insulated (MMI) coil] through charge-discharge, dc pulse, and overcurrent tests. The charge- discharge and dc pulse test results for the coils demonstrated that MMI coils can be charged and discharged significantly faster than noninsulated (NI) or metallic-insulated (MI) coils. In overcurrent tests at 130 A (~1.3I c ), the MMI coils exhibited better electrical behavior than its counterpart co-wound with Kapton tape as turnto-turn insulation. The charging-discharging delay times for the MMI coils decreased with an increasing number of metal tapes within the coils. Moreover, the experimental and analytical results are in good agreement, which demonstrates the validity of a concise equivalent parallel-RL circuit model for the MMI coil. Overall, the MMI winding technique is highly promising and can provide the development of compact, mechanically robust, and selfprotecting REBCO magnets with enhanced thermal/electrical stability.

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  9. [해외논문]   Characteristic Irreversible Critical Strain Limit of GdBCO-Coated Conductor Tapes Under Various Temperature and Magnetic Field Conditions   SCI SCIE

    Gorospe, Alking , Bautista, Zhierwinjay , Hyung-Seop Shin , Oguro, Hidetoshi , Awaji, Satoshi
    IEEE transactions on applied superconductivity : a publication of the IEEE Superconductivity Committee v.27 no.4 pt.3 ,pp. 1 - 5 , 2017 , 1051-8223 ,

    초록

    Superior mechanical and electromechanical properties of the coated conductor (CC) tapes made them a viable option for coil and magnet applications. In this study, investigation on the characteristics of I c under different B, T, and ε conditions were conducted. Tensile load was applied using the Katagiri type test rig under different high magnetic field and low-temperature conditions wherein irreversible strain, ε irr was determined. The I c behavior with magnetic field of both reactive co-evaporation by deposition and reaction (RCE-DR) and metal organic chemical vapor deposition (MOCVD) processed CC tapes at different T and B were obtained. The critical irreversible strain limit ε irr of Cu-stabilized REBCO CC tape increased with decreasing temperature from 65 K down to 20 K. This behavior was resulted from the increased yield strength of the CC tape due to thermal hardening effect.

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  10. [해외논문]   Fabrication and Physical Properties of Polycrystalline Iron-Chalcogenides Superconductors   SCI SCIE

    Fiamozzi Zignani, Chiarasole , De Marzi, Gianluca , Grimaldi, Gaia , Leo, Antonio , Guarino, Anita , Vannozzi, Angelo , della Corte, Antonio , Pace, Sandro
    IEEE transactions on applied superconductivity : a publication of the IEEE Superconductivity Committee v.27 no.4 pt.3 ,pp. 1 - 5 , 2017 , 1051-8223 ,

    초록

    Iron-based superconductors are an interesting class of materials that have attracted significant interest during the last years, and which could be employed in a variety of potential applications due to their high upper critical field H c2 . In order to exploit the properties of these materials for practical applications, in this paper we explore two different routes for the fabrication of polycrystalline samples belonging to 11-family. In particular, the influence of dedicated heat treatments has been investigated to optimize their overall superconducting properties. Then, we compared the pinning properties of these two types of samples to correlate the fabrication process with the pinning landscape. The final aim is to obtain an increased T c and H c2 , as well as an enhanced pinning efficacy, which could lead to higher critical current density J c relevant for practical uses.

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