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

  1. [해외논문]   Superior Jc-B-T Characteristics of 10-μm-Thick MgB2 Film for Tape Application   SCI SCIE

    Kusunoki, Toshiaki (R&D Group, Hitachi, Ltd., Hitachi, Japan ) , Yamamoto, Hiroyuki (R&D Group, Hitachi, Ltd., Hitachi, Japan) , Kodama, Motomune , Kotaki, Hiroshi , Tanaka, Hideki , Nishijima, Gen , Horii, Shigeru , Doi, Toshiya
    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

    Superior Jc-B-T characteristics of 10-μm-thick MgB 2 films on copper plates were obtained. The Jc-B-T properties were measured at a temperature range from 5 to 20 K and at an external magnetic field range from 0 to 17 T. At B = 6 T, Jc were 54 200, 30 840, 9900, and 820 A/mm 2 at T = 5, 10, 15, and 20 K, respectively. The high Jc suggest that MgB 2 film is a promising candidate for next-generation superconducting tape conductors and coils.

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  2. [해외논문]   Quenching Current by Flux-Flow Instability in Iron-Chalcogenides Thin Films   SCI SCIE

    Leo, A. , Grimaldi, G. , Guarino, A. , Avitabile, F. , Marra, P. , Citro, R. , Braccini, V. , Bellingeri, E. , Ferdeghini, C. , Pace, S. , Nigro, A.
    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

    The stability against quench is one of the main issues to be pursued in a superconducting material, which should be able to perform at very high levels of current densities. Here we focus on the connection between the critical current I c and the quenching current I* associated to the so-called Flux-Flow Instability phenomenon, which sets-in as an abrupt transition from the flux flow state to the normal state. To this purpose, we analyze several current-voltage characteristics of three types of Iron-Based thin films, acquired at different temperature and applied magnetic field values. For these samples, we discuss the impact of a possible coexistence of intrinsic electronic mechanisms and extrinsic thermal effects on the quenching current dependence upon the applied magnetic field. The differences between the quenching current and the critical current are also reported in the case of predominant intrinsic mechanisms. Carrying out a comparison with the HTS case, we suggest, which material can be the best tradeoff between maximum operating temperature, higher upper critical field, and stability under high current bias.

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  3. [해외논문]   The Effect of Hydrostatic Pressure on the Superconducting and Structural Properties of Nb $_3$Sn: Ab-initio Modeling and SR-XRD Investigation   SCI SCIE

    Loria, Rita , De Marzi, Gianluca , Anzellini, Simone , Muzzi, Luigi , Pompeo, Nicola , Gala, Fabrizio , Silva, Enrico , Meneghini, Carlo
    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 report on the investigations of the structural and superconducting properties of Nb 3 Sn in the GPa range by angular dispersive synchrotron X-ray diffraction and ab-initio calculations based on density functional theory. X-ray Diffraction experiments were carried out on Nb 3 Sn technological samples to explore the equation of state at room temperature and at pressures up to 43.5 GPa: We observe an anomaly in the P-V curve in the region 5-10 GPa. The ab-initio calculated lattice parameter of Nb 3 Sn as a function of pressure has been used as an input for the calculation of the phonon dispersion curves and of the electronic band structures along different high-symmetry directions in the Brillouin zone. The critical temperature has been calculated as a function of the hydrostatic pressure by means of the Allen-Dynes modification of the McMillan formula: We found that its behavior is dictated mostly by the electronic contribution, but evident anomalies up to 6 GPa arise from phonons. These findings are a clue that Nb 3 Sn could have some structural instabilities with impact on its superconducting properties when subjected to a pressure of a few GPa and they represent an important step to understand and optimize the performances of Nb 3 Sn materials under the hard operational conditions of high field superconducting magnets.

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  4. [해외논문]   An Experimental and Analytical Study of Periodic and Aperiodic Fluctuations in the Critical Current of Long Coated Conductors   SCI SCIE

    Xinbo Hu , Rossi, Lidia , Stangl, Alexander , Sinclair, John Willam , Kametani, Fumitake , Abraimov, Dmytro , Polyanskii, Anatolii , Coulter, James Y. , Jaroszynski, Jan , Larbalestier, David C.
    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

    It is well known that the critical current of all coated conductors fluctuates along their length and from run to run for reasons that are seldom reported in detail and may not always be understood. Here, we report results obtained with a reel-to-reel transport and magnetization measurement apparatus that allows 77-K measurements with a resolution of about 20 and 1 mm, respectively. Analysis of these data assesses both periodic and random contributions to the critical current fluctuations. We find multiple sources of the fluctuations, and, thus, many different types of behavior. A very positive result is that fluctuations are definitely decreasing in more recent conductors. We show how to reveal fluctuations due to variations of the active cross section of the conductor (i.e., an IC variation) and to variations of the superconducting properties themselves. We found that the latter dominates in the vast majority of conductors studied.

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  5. [해외논문]   Superconducting Properties of 100-m Class Sr0.6K0.4Fe2As2 Tape and Pancake Coils   SCI SCIE

    Xianping Zhang , Oguro, Hidetoshi , Chao Yao , Chiheng Dong , Zhongtang Xu , Dongliang Wang , Awaji, Satoshi , Watanabe, Kazuo , Yanwei Ma
    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-pnictides are hotly studied since 2008 in the superconducting materials research area, due to their special properties and unclear mechanism. Big achievement has been made in the pnictide research during the past years. For practical uses, pnictide superconductor should be fabricated in a form that can be used for different devices. In this paper, 100-m class 7-core Sr 0.6 K 0.4 Fe 2 As 2 (Sr122) tapes have been made by using the powder-in-tube technique, which is reported for the first time. Clearly, an average J c of 1.3 × 10 4 A/cm 2 at 10 T was reached over the 115-m length, showing a high property and good uniformity of 100-m level Sr122 tapes. Using the 10-m long Sr122 tapes, two double-pancake coils were fabricated by a wind and reaction technique. No transport current could be measured for the coil made from the monofilamentary tape. However, transport I c was obtained in the coil made from the 7-filamentary tape. The factors that affect the superconducting property of the coil were discussed in this paper.

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  6. [해외논문]   Key Factors for Insulator–Superconductor Transition in FeSe Thin Films by Electric Field   SCI SCIE

    Hanzawa, Kota , Sato, Hikaru , Hiramatsu, Hidenori , Kamiya, Toshio , Hosono, Hideo
    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

    Insulator-like FeSe epitaxial thin films were grown at three different growth conditions (i.e., at Fe flux rates = 2, 4, and 6 × 10 -6 Pa under a constant Se flux rate), and the superconducting properties induced by electric double-layer transistors (EDLTs) were investigated in relation to the crystal/defect structures of the FeSe channels. The maximum critical temperature (T c ) of 35 K was obtained for the FeSe channel grown at the intermediate Fe flux rate. The other EDLTs (i.e., grown at a higher and a lower Fe flux rates, respectively) exhibited lower T c of ≈20 K, which were in the underand the overdoped states, respectively, as confirmed by Hall effect measurements. The underdoped state of the channel grown at the higher rate is explained by electron traps at surface pits. This study revealed that high crystallinity and atomically flat surfaces are the key factors to achieving the optimum doping level and inducing the high T c in insulator-like FeSe EDLTs.

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  7. [해외논문]   Synchrotron Microtomography Investigation of the Filament Microstructure in Differently Processed Bi-2212 Wires   SCI SCIE

    Scheuerlein, Christian , Rack, Alexander , Schladitz, Katja , Huwig, Luisa
    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

    The Bi-2212 microstructure and porosity distribution in entire state-of-the-art multifilament wires was characterized by high-energy synchrotron X-ray absorption microtomography after meltprocessing at ambient pressure, at 100 bar overpressure, and at ambient pressure after prior cold isostatic pressing of initially identical as-drawn wires. Beyond the visualization of the Bi-2212 microstructure, the porosity distribution in the different filament bundles has been quantified. Spherical granulometry and finite percolation probability calculations have been performed in order to provide a measure for the porosity distribution and to compare filament connectivity in the axial wire direction. Possible artifacts of the microtomography (μ-CT) experiment and the possibility to estimate the effect of the Bi-2212 microstructure as seen in the μ-CT images on critical current density are discussed.

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  8. [해외논문]   Enhanced Pinning Properties of GdBa2Cu3O7-δ Films With the Gd 2O3 Nanoparticles   SCI SCIE

    Won-Jae Oh , Jae-Eun Kim , 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

    We tried to optimize the pinning properties of GdBa 2 Cu 3 O 7-δ (GdBCO) films with the Gd 2 O 3 nanoparticles. The GdBCO films with the Gd 2 O 3 contents of 0, 2, 5, 7, and 10 mol% were fabricated on CeO 2 -buffered MgO (100) substrate by pulsed laser deposition. Among these samples, 5 mol% (= 2.2 vol%) Gd 2 O 3 -doped GdBCO film exhibited the highest critical current density (J c ) values compared with other samples at temperatures of 20 and 40 K for B//c, and it also showed the maximum pinning force density (F p,max ) value of 119 GN/m 3 near 3.8 T at 20 K, indicating that 5 mol% Gd 2 O 3 is the optimum doping content below 40 K. However, the Gd 2 O 3 nanoparticles were ineffective for flux pinning at higher temperatures (>65 K). Analysis by transmission electron microscopy for this sample revealed that the Gd 2 O 3 nanoparticles of ~20 nm in diameter randomly dispersed in the GdBCO matrix. This peculiar pinning characteristics of 2.2 vol% Gd 2 O 3 -doped GdBCO film in comparison with 2.5 vol% Y 2 O 3 -doped YBCO film [P. Mele et al. 2007] are attributable to more severe degradation of Tc,zero and also to much larger particle size of Gd 2 O 3 compared with that of Y 2 O 3 nanoparticles (~8 nm).

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  9. [해외논문]   Boltzmann Analysis of Cryogenic $\text{He}$ $\text{H}_{\text{2}}$ Gas Mixtures as Dielectric Media for High-Temperature Superconducting Power Devices   SCI SCIE

    Chanyeop Park , Pamidi, Sastry , Graber, Lukas
    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

    Analysis of the dielectric properties of gas mixtures in the context of their application as cryogens for high-temperature superconducting power applications is presented. Boltzmann analysis was conducted for pure gaseous helium (He) and its mixtures consisting of small mole fractions of gaseous hydrogen (H 2 ) to establish a theoretical foundation for the observed enhancement in dielectric strength at cryogenic temperatures. Boltzmann analysis showed that the electron energy distribution function shifts to the lower energy region, the reduced ionization coefficient (α/N), and the reduced effective ionization coefficient ((α - η)/N) decreases, whereas the reduced attachment coefficient (η/N) and the reduced critical electric field ((E/N)cr) increases as the mole fractions of H 2 increase in the He-H 2 mixture. The results of the analysis predict a persisting enhancement of dielectric strength by adding larger amounts of H 2 beyond the reported 4 mol% in the He-H 2 mixtures. The analysis also provides a basis for identifying a suitable gas mixture for gaseous cryogen cooled superconducting device with a required power rating.

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  10. [해외논문]   Influence of Substrate Tilt Angle on the Incorporation of BaHfO3 in Thick YBa2Cu 3O7‐δ Films   SCI SCIE

    Sieger, Max (IFW Dresden, Dresden, Germany ) , Pahlke, Patrick (IFW Dresden, Dresden, Germany ) , Ottolinger, Rick (Atominst., Tech. Univ. Wien, Vienna, Austria ) , Stafford, Benjamin Hamilton (Electron Microscopy for Mater. Sci., Univ. of Antwerp, Antwerp, Belgium ) , Lao, Mayraluna (IFW Dresden, Dresden, Germany ) , Meledin, Alexander (IFW Dresden, Dresden, Germany) , Bauer, Markus , Eisterer, Michael , Van Tendeloo, Gustaaf , Schultz, Ludwig , Nielsch, Kornelius , Huhne, Ruben
    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

    High critical current densities can be realized in high-temperature superconductors, such as YBa 2 Cu 3 O 7-δ (YBCO), by controlling the density, shape, size, and direction of a secondary phase. Whereas the dependence on the growth rate and deposition temperature has been widely studied as key parameters for nano-engineering the pinning landscape, the vicinal tilt of the substrate surface might have an additional influence. Therefore, we deposited 6 mol% BaHfO 3 (BHO)-doped YBCO on SrTiO 3 (STO) substrates with vicinal angles α between 0° and 40° to identify the influence of the tilt on the growth mode of BHO. An undisturbed epitaxial growth of the superconductor as well as an epitaxial integration of the BHO phase in the YBCO matrix is observed for all vicinal angles investigated. The critical temperature is constant up to α = 20°, whereas the self-field critical current density at 77 K starts to decrease above 10°. A detailed structural analysis of the film cross sections showed that the growth mode of BHO changes already for a vicinal tilt of 2° from a pure c-axis oriented growth to a layered structure with BHO aligned parallel to the YBCO ab-plane. We identified a strong influence of such a microstructure on the current flow in BHO-doped YBCO films on STO substrates as well as on MgO-based coated conductors prepared by inclined substrate deposition.

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