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  • 1
    Electronic Resource
    Electronic Resource
    Development of a micromachining process for the fabrication of a superconductor magnetic-field sensor (1999)
    Springer
    Microsystem technologies 6 (1999), S. 67-72 
    Details
    ISSN: 1432-1858
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Technology
    Notes: Abstract This paper reports an effort to introduce high temperature superconductor (HTS) into the MEMS (microelectromechanical systems) field, to develop fabrication procedures suitable for HTS, and using them to fabricate a prototype superconductor microsensor for magnetic field detection. The prototype device fabricated is a sensor based on the giant magnetoresistivity of a high temperature superconductor around its critical temperature. It was fabricated using optical lithography and electrodeposition of Tl1Ba2Ca2Cu3Ox (Tl-1223) type high T C superconductors. The test results of the prototype sensor fabricated show that the prototype sensor has a very high magnetoresistivity at medium to strong magnetic field strength and low magnetoresistivity at weak magnetic field. Our work suggests that in order to develop a high precision magnetic sensor for the detection of very weak magnetic fields, other HTS materials with less flux pinning effect and more weak links need to be pursued. The MEMS fabrication process developed is simple, repeatable, and applicable to microfabrication of other types of superconductor devices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005420050177
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  • 2
    Electronic Resource
    Electronic Resource
    Erratum: "LaNiO3 buffer layers for high critical current density YBa2Cu3O7−δ and Tl2Ba2CaCu2O8−δ films" [Appl. Phys. Lett. 75, 2479 (1999)] (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 3886-3886 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.124249
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  • 3
    Electronic Resource
    Electronic Resource
    LaNiO3 buffer layers for high critical current density YBa2Cu3O7−δ and Tl2Ba2CaCu2O8−δ films (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 2479-2481 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We demonstrate high critical current density superconducting films of YBa2Cu3O7−δ (YBCO) and Tl2Ba2CaCu2O8−δ (Tl-2212) using LaNiO3 (LNO) buffer layers. YBCO films grown on an LNO buffer layer have only a slightly lower Jc (5 K, H=0) than films grown directly on a bare LaAlO3 substrate. YBCO films grown on LNO buffer layers exhibit minor microstructural disorder and enhanced flux pinning. LNO-buffered Tl-2212 samples show large reductions in Jc at all temperatures and fields compared to those grown on bare LaAlO3, correlating to both a-axis grain and nonsuperconducting phase formation. LNO could be a promising buffer layer for both YBCO and Tl-based superconducting films in coated conductor applications. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125054
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  • 4
    Electronic Resource
    Electronic Resource
    Critical currents and processing of wound coils of Ag-sheathed Bi-2223 high Tc tape: Microstructural and pinning effects (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 736-738 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using a "powder-in-tube'' process long lengths of high Tc prototype tape have been fabricated with high critical currents at liquid-nitrogen temperature and excellent high field properties at liquid-helium temperature. A Pb-doped bismuth-based 2223 powder was initially prepared then packed into silver tubes. Using a combination of cold work and heat treatment, a high degree of texture and good compaction with uniform properties was achieved. Current densities exceeding 10 000 A/cm2 at 77 K and 50 000 A/cm2 at 4.2 K in zero field were measured. At the 4.2 K temperature, the material still carried approximately 14 000 A/cm2 at 8 T. Tests on spirally wound and reacted coils, 52 cm long, have also demonstrated high current carrying capability. Effects of process variations and observed microstructure on superconducting properties are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105328
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  • 5
    Electronic Resource
    Electronic Resource
    Thick-Film Processing for Tl-Oxide Wire and Tape (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 173-180 
    Details
    ISSN: 1572-9605
    Keywords: Thick-Film ; electrodeposition ; textured substrates ; Tl-oxides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Thick-film processing techniques such as electrodeposition, electrophoresis, spray pyrolysis, and ink spraying offer promising and economic (〈$10/kAm) approaches for fabricating high-temperature superconducting (HTS) wire or tape for the Tl-oxide superconductors. The performance of the Tl system exceeds that for the Bi-oxides and offers easier fabrication than YBCO. Scale up, however, may be difficult because of the need for open tape conductors with aligned microstructures. The Tl-oxides, moreover, offer the potential for operation at 77K in practical magnetic fields of 3-5 T, which is supported by measurements on the irreversibility behavior of the Tl-1223 single layer compound with Pb, Bi, and Sr substitution. Recent advances in the development of biaxial textured electrodeposited films on Ag coated single crystal substrates are discussed. This paper will review the merits for a near-term Tl-oxide based conductor for use in HTS electric power applications, currently under development, such as the transformer and transmission cable. Recent results for the buffer layer development that would provide an oriented ceramic layer or template on a flexible textured nickel substrate utilizing the “RABiTS” substrates developed by ORNL will then be discussed with a projection for the cost of a “long length” thick-film process using electrodeposition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022660130028
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  • 6
    Electronic Resource
    Electronic Resource
    Atomic ordering and superconductivity in A-15 compounds (1969)
    Springer
    Journal of low temperature physics 1 (1969), S. 539-561 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Twenty-six different binary A-15 compounds were investigated to determine if superconductivity could be related to the degree of long-range atomic ordering on the crystallographic lattice sites. Significant changes in the superconducting transition temperatures and critical fields were produced by quenching from high temperatures followed by low-temperature annealing. These changes inT cwere accompanied by changes in the degree of long-range ordering as determined using x-ray diffraction methods. The results can be interpreted within the framework of Weger's “linear-chain” model only when the B-element is a nontransition element. When both the A-and B-components are transition elements, however, the superconducting behavior will apparently depend on the nature of “d-electron” interactions between the component atoms. Complete ordering is not always an essential requirement for optimizing the superconducting properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00627932
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