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  • 1
    Digitale Medien
    Digitale Medien
    Substrate step-edge YBa2Cu3O7 rf SQUIDs (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 543-545 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We have developed a technique which permits high-yield fabrication of microbridges and low noise YBa2Cu3O7 superconducting quantum interference devices (SQUIDs) in epitaxial thin films. These SQUIDs operate over a wide temperature range extending from 4 K to close to the superconducting transition temperature. Measurements of an rf SQUID operating at 77 K give a peak-to-peak flux sensitivity of 36 μV/Φ0 and a flux noise at 10 Hz of 1.5× 10−4 Φ0/(square root of)Hz. Device yields over 80% have been obtained.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.104581
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  • 2
    Digitale Medien
    Digitale Medien
    Microstrip resonators using two-sided metalorganic chemical vapor deposited Er-Ba-Cu-O thin films (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 1109-1111 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We have measured very low microwave losses in microstrip resonators produced in a newly developed process which deposits high-temperature Er-Ba-Cu-O superconducting films by metalorganic chemical vapor deposition on both sides of a LaAlO3 substrate. These in situ films have critical temperatures of 92 K. High Tc superconductor (HTS) linear microstrip resonators demonstrated Q's of 3500 at 10 GHz and 4.2 K, corresponding to surface resistances less than 330 μΩ, which is 45 times better than measured silver resoantors. HTS meanderline resonators with a fundamental frequency of 1.3 GHz have Q's of 9600 at 4.2 K. Identical silver meanderline circuits have 300 times more surface resistance than HTS circuits.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.104387
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  • 3
    Digitale Medien
    Digitale Medien
    Low-loss substrate for epitaxial growth of high-temperature superconductor thin films (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 2677-2679 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A perovskite-like single-crystal substrate material has been investigated that simultaneously permits epitaxial growth of 1-2-3 superconductor films and possesses desirable rf properties of low dielectric constant and loss tangent. The lattice constant of 3.792 A(ring) provides a lattice match to within 1% of the a axis of 1-2-3. Sputtered films of erbium-barium-copper-oxide have been produced on (100) LaAlO3 substrates that exhibit sharp resistive transitions at 90 K (ΔT=1K), bulk superconductivity as determined by ac susceptibility measurements, and nearly single-crystal growth as evidenced by x-ray diffraction and high-resolution scanning electron microscopy. The high-frequency dielectric properties of LaAlO3 were experimentally investigated at several temperatures. The low-frequency dielectric constant was measured to be 15 and the microwave loss tangent ranged from 6×10−4 at room temperature to 5×10−6 at 4 K.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.100543
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  • 4
    Digitale Medien
    Digitale Medien
    Multisource-sputtered ErBa2Cu3O7−x films on single-crystal and buffered crystalline substrates (1988)
    Springer
    Journal of superconductivity 1 (1988), S. 313-326 
    Details
    ISSN: 1572-9605
    Schlagwort(e): Erbium-barium-copper-oxide ; sputtering ; buffered substrates ; multisource sputtering ; silicon substrates ; SNMS ; depth profiling
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract High-quality superconducting films of erbium-barium-copper-oxide have been produced in a multisource sputtering system on a variety of substrates, including buffered sapphire and silicon wafers as well as various single-crystal materials. Fine-grained polycrystalline films with narrow (〈4 K) resistive transitions have been grown on a number of different substrates. The use of erbium in the 12–3 compound leads to improved film morphology and to more forgiving conditions for establishing of the superconducting phase. Sputtered neutral mass spectroscopy (SNMS) yields useful information about the compositional profile of the films.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00617720
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  • 5
    Digitale Medien
    Digitale Medien
    High-performance microwave circuits on LaAlO3 (1990)
    Springer
    Journal of superconductivity 3 (1990), S. 305-310 
    Details
    ISSN: 1572-9605
    Schlagwort(e): High-temperature superconductor ; microwave filter
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract Microwave properties of high-temperature films deposited on LaAlO3 substrate are presented. The films are grownin situ using a high-pressure single-source sputtering technique. Microwave resonators and filters are fabricated and tested. The maximum measuredQ values are 1400; the surface resistances were less than 360μΩ between 4.2 and 50 K. The filter performance was 18 dB better than a similar filter fabricated in Ag.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00625272
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