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  • 1
    Electronic Resource
    Electronic Resource
    High Q coplanar transmission line resonator of YBa2Cu3O7−x on MgO (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 1029-1031 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present the first coplanar waveguide transmission line resonator patterned from a perovskite high Tc superconducting film at 9 GHz. At 77 K the unloaded quality factor Q0 of the resonator patterned from a YBa2Cu3O7−x film on a MgO substrate is 1300, that is, 14 times higher than that of the copper resonator and 17 times higher than that of the gold resonator at the same temperature. At 4.2 K a Q0 factor of 3300 was measured for the YBa2Cu3O7−x /MgO resonator. Simple calculations of the quality factor show that values of 10 000 at 77 K should be possible using better substrates, films, and etching techniques. This resonator could form the basic structure of more complex microwave filter systems operating at liquid-nitrogen temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101576
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Radio frequency performance of superconducting thin films in high magnetic fields (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 3491-3493 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We describe measurements of the specific resistivity of epitaxially grown YBa2Cu3O7−x thin films in the presence of a magnetic field of up to 1 T at 270 MHz. At 77 K and 300 mT a 70-fold reduction of the specific resistance, as compared to liquid nitrogen cooled copper, is achieved. These results suggest a possible application of these films as small receiving coils with improved sensitivity in low field nuclear magnetic resonance imaging systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111250
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Microwave properties of YBa2Cu3O7−x thin films studied with coplanar transmission line resonators (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 1866-1872 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The microwave properties of epitaxial YBa2Cu3O7−x thin films with critical temperatures Tc up to 91.5 K and critical current densities Jc up to 6×106 A/cm2 at 77 K have been investigated between 5 and 20 GHz using coplanar transmission line resonators. Information about the surface resistance Rs and the magnetic penetration depth λL has been obtained from temperature- and power-dependent measurements of the quality factors and resonance frequencies of the resonators. The lowest surface resistance was 105 μΩ at 77 K and 38 μΩ at 9 K measured at 6.2 GHz, respectively. The dependence of Rs on the surface magnetic field Brf showed that with decreasing film quality the films exhibit a granular behavior. At high critical current densities Jc(approximately-greater-than)4×106 A/cm2, the intrinsic properties of the material show up. The magnetic penetration depth was in the range between 160 and 270 nm. Both Rs and λL turned out to be sensitive to the film quality represented by the transition width ΔTc and the critical current density Jc at 77 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353173
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    Paper (German National Licenses)
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