Superconducting Transition Temperature
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Electro International, 1991, 1991
IEEE Spectrum, 1988
The two-part special report discusses the recently developed high-temperature superconducting ceramics. The first part describes promising processing advances and examines concerns about critical current density and brittleness. Both problems present a serious roadblock to practical use of these materials. The second part investigates the more interesting and feasible applications, which appear to be several years away. An accompanying box insert ...
IEEE Transactions on Applied Superconductivity, 1997
We have investigated thin film composites of YBa/sub 2/Cu/sub 3/O/sub 7/ (YBCO) with Ag for fluxonic device applications. YBCO/Ag composite films are produced by first depositing a layer of Ag onto a substrate and then heating the film to the YBCO deposition temperature of 680/spl deg/C or higher. YBCO is deposited by off-axis sputtering onto the Ag-coated substrate. The resulting ...
IEEE Transactions on Nuclear Science, 1977
Tolerance of superconducting magnets to beam heating can be crucial. The magnets described produce a dipole field between parallel current sheets. Images in iron extend the sheets. The field is parallel to the current sheets so that high purity aluminum spacers can extend over the full length and height of the coil. High aluminum thermal conductivity and diffusivity results in ...
Proceedings of the 15th Annual International Conference of the IEEE Engineering in Medicine and Biology Societ, 1993
ASC-2014 SQUIDs 50th Anniversary: 1 of 6 Arnold Silver
Interaction of ferromagnetic and superconducting permanent magnets - superconducting levitation
ISEC 2013 Special Gordon Donaldson Session: Remembering Gordon Donaldson - 2 of 7 - Gordon Donaldson: A Memory - part II - Colin Pegrum
MIRAI Program and the New Super-high Field NMR Initiative in Japan - Applied Superconductivity Conference 2018
ISEC 2013 Special Gordon Donaldson Session: Remembering Gordon Donaldson - 1 of 7 - Gordon Donaldson: A Memory - part I - John Clarke
30 Years to High Temperature Superconductivity (HTS): Status and Perspectives
High-current HTS cables for magnet applications - ASC-2014 Plenary series - 8 of 13 - Thursday 2014/8/14
Voltage Metrology with Superconductive Electronics
One HTS Josephson Junction, An Array of Applications: Has anything come from HTS devices in the last 30 years?
Superconductive Energy-Efficient Computing - ASC-2014 Plenary-series - 6 of 13 - Wednesday 2014/8/13
Surgical Robotics: Transition to Automation
Development of Quantum Annealing Technology at D-Wave Systems - 2018 IEEE Industry Summit on the Future of Computing
Applications of Superconductivity in the Detection of Axions - Applied Superconductivity Conference 2018
High Magnetic Field Science and its Application in the US - ASC-2014 Plenary series - 10 of 13 - Friday 2014/8/15
CES 2008: Herman Miller's C2 Climate Control for the desktop
ASC-2014 SQUIDs 50th Anniversary: 2 of 6 - John Clarke - The Ubiquitous SQUID
Superconductors for the Future from the Perspective of the Past
Superconducting quantum computing research in Japan - Applied Superconductivity Conference 2018
IMS 2011-100 Years of Superconductivity (1911-2011) - Existing and Emerging RF Applications of Superconductivity
The two-part special report discusses the recently developed high-temperature superconducting ceramics. The first part describes promising processing advances and examines concerns about critical current density and brittleness. Both problems present a serious roadblock to practical use of these materials. The second part investigates the more interesting and feasible applications, which appear to be several years away. An accompanying box insert on theory explains what is known about superconductivity in these ceramics.<>
We have investigated thin film composites of YBa/sub 2/Cu/sub 3/O/sub 7/ (YBCO) with Ag for fluxonic device applications. YBCO/Ag composite films are produced by first depositing a layer of Ag onto a substrate and then heating the film to the YBCO deposition temperature of 680/spl deg/C or higher. YBCO is deposited by off-axis sputtering onto the Ag-coated substrate. The resulting YBCO/Ag film is a composite of YBCO with well-defined Ag regions several microns in size. Scanning electron micrograph images of the films' surfaces show a background of smooth YBCO grains dotted with Ag clusters. For a wide range of increasing Ag composition, the transition temperatures of the composite films on SrTiO/sub 3/ remain high, while the critical current densities have been reduced as much as 65 times. On MgO substrates, critical current density has been reduced by more than four orders of magnitude. Also on MgO, significant voltage response is seen in external magnetic fields of less than 1 mT. These measurements suggest that the films may be arrays of superconductor-normal-superconductor (SNS) junctions formed by weakly coupled YBCO grains with Ag in the grain boundaries. The field responsivity and low critical current densities of these composites make them potentially useful for fabrication of fluxonic devices.
Tolerance of superconducting magnets to beam heating can be crucial. The magnets described produce a dipole field between parallel current sheets. Images in iron extend the sheets. The field is parallel to the current sheets so that high purity aluminum spacers can extend over the full length and height of the coil. High aluminum thermal conductivity and diffusivity results in locally produced heat being dissipated into helium over a large area. All magnets show little training with complete "memory" to ~ 100% of short sample. B induced quenching is not observed. The 2 m, 8° dipole coils do not quench at 4 T if the correcting coil is driven normal, dissipating > 1 kW. Intralayer quench propagation induced by 30 GeV protons is described. A 1 m, 6 T pulsed dipole first quenched at 5 T. Pulsing losses at 0.5 T/sec are small.
In this paper, we prepared alternately layered MgB2/B examine the superconducting properties of multilayered MgB2thin films prepared inserting a very thin layer of boron between MgB2. The multilayered MgB2/B thin films were prepared successfully using electron beam evaporation technique without any post-annealing. No inter-diffusion of magnesium and boron can be detected in the multilayered thin films consist of individual MgB2and boron layers.
The measurement of the surface resistance has always been a difficult challenge at microwave frequencies, especially if it concerns superconductors in the transition region where the accuracy of the measurements is strongly influenced by the temperature fluctuations. In this paper we present a new method to measure the microwave surface resistance of superconducting thin- films at cryogenic temperatures. The method, based on the principle of the equivalence of the thermal effects, is effective for the superconductors that generally have a good bolometric behavior in the transition region. It is a complementary approach to the usual resonant cavity methods which fail near the T/sub c/ because of thermal instability. In practice we use a microcalorimeter whose thermal load is a superconducting thin-film that works as a matched bolometer in a quasiadiabatic environment and in a well known thermodynamical equilibrium. The total uncertainty of the surface resistance measurements made with our method is estimated to be about 1.5%. The apparatus has been tested in the Ka frequency band (26.5 to 40) GHz for low-T/sub c/ superconductors and it is also proposed for the high-T/sub c/ thin-films that require a thermal environment less critical than liquid helium.
A novel type of three-terminal Josephson device called the SCST (superconducting current switching transistor), was fabricated using high-T/sub c/ LnBaCuO (Ln=Y, Er) thin epitaxial and/or polycrystalline films. The hot quasi-particle injection effect on the Josephson (or superconducting) current in the films was closely examined. The zero bias drain current was efficiently suppressed by the injection of the hot quasi-particles through the gate electrode. A comparison of the experimental results and analyses based on the BCS theory suggests that the main mechanism of the current modulation is the nonequilibrium superconductivity due to the accumulation of the excess quasi-particles. The maximum current modulation gain was 5 approximately 7 and the modulation current ranged as low as 3 approximately 10 A/cm/sup 2/.<>
We have investigated the upper critical fields of Y/sub 1-x/Er/sub x/Ni/sub 2/B/sub 2/C and Y/sub 1-x/Er/sub x/Pd/sub 5/B/sub 3/C/sub 0.4/ (0/spl les/x/spl les/1) systems by the scaling analysis of the thermal fluctuation conductivity. The experiments were done over wide magnetic field range. We are going to test the thermal fluctuation theory in the borocarbide superconducting systems. According to the scaling analysis, the thermal fluctuation conductivity should be scaled as /spl sigma//sub f/=((T2)/H)(1/3)F[A(T-Tc(H))/((TH)(2/3))]. Because the scaling function is field independent, all scaling curves obtained under various applied fields should converge to a universal curve if the function of T/sub c/(H) is properly chosen, We therefore obtain H/sub c2/(T) determined by optimizing the scaling fit. The superconducting coherence length and Ginzburg-Landau parameter K in those superconductors are also estimated. We categorize the Y/sub 1-x/Er/sub x/Ni/sub 2/B/sub 2/C and Y/sub 1-x/Er/sub x/Pd/sub 5/B/sub 3/C/sub 0.4/ systems as strong type-II superconductors.
Arising from the superconductivity at ~39 K, magnesium diboride (MgB2) films have great prospect in the field of superconducting radio-frequency (SRF) cavities. To match the geometrical shape of the inner surface of the SRF cavities, the deposition techniques for inward curved MgB2 superconducting films are explored. By using pre-bent metallic substrates, curved MgB2 films were deposited in situ. These curved films show properties comparable with those of the films deposited on a plane surface. Even when the curvature radius (CR) of the films is as small as ~2 mm, the superconducting transition temperature TC(R = 0) of the films reaches ~36 K. The in situ-grown films were also compared with the films prepared by postdeposition bending. In the bending of CR ~ 2 mm, TC(R = 0) of the films falls off to 25 K, much lower than that of the in situ-grown films with the same CR. The scanning results of electron microscope indicate that the wrinkles and cracks appearing in the bending are the main reason for the degradation of transition temperature.
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