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  • 1
    Electronic Resource
    Electronic Resource
    Characteristics and growth of single crystals of Y1Ba2Cu3O7 with superior microwave properties (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 696-698 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the fabrication and high-frequency characterization of single crystals of Y1Ba2Cu3O7 with extremely sharp microwave transitions. The 10 GHz surface resistance Rs is less than 400 μΩ, at temperatures 4 K below the transition temperature. The electrodynamic characteristics of these crystals were examined via several measurements, and we demonstrate that high quality crystals which show very low Rs also possess small penetration depths λ(0)=1600 A(ring) and small magnetic field effects on the penetration depth characterized by k(0)≡(dλ/dB2)T→0=10−3 A(ring)/G2. In polycrystals, and even in poor single crystals, the presence of Josephson junctions of typical effective area ∼4 μm2 leads to poor microwave properties, with electrodynamic parameters orders of magnitude larger.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102440
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Scanned perturbation technique for imaging electromagnetic standing wave patterns of microwave cavities (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 3410-3417 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have developed a method to measure the electric field standing wave distributions in a microwave resonator using a scanned perturbation technique. Fast and reliable solutions to the Helmholtz equation (and to the Schrödinger equation for two-dimensional systems) with arbitrarily shaped boundaries are obtained. We use a pin perturbation to image primarily the microwave electric field amplitude, and we demonstrate the ability to image broken time-reversal symmetry standing wave patterns produced with a magnetized ferrite in the cavity. The whole cavity, including areas very close to the walls, can be imaged using this technique with high spatial resolution over a broad range of frequencies. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149108
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A broadband method for the measurement of the surface impedance of thin films at microwave frequencies (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 2082-2090 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We present a new technique to measure the complex surface impedance of the mixed state of superconducting thin films over the broad frequency range 45 MHz–20 GHz. The surface impedance is extracted from measurements of the complex reflection coefficient made on the film using a vector network analyzer. The technique takes advantage of a special geometry in which the self-fields from currents flowing in the film are everywhere parallel to the film surface, making it an ideal configuration in which to study vortex dynamics in superconductors. The broadband nature of the measurement system allows us to explore a region of magnetic field–temperature–frequency parameter space of superconductors previously inaccessible with other measurement techniques. The power of the technique is illustrated by measurements on thin films of the high temperature superconductor YBa2Cu3O7−δ.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144816
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  • 4
    Electronic Resource
    Electronic Resource
    Deposition and reduction of Nd1.85Ce0.15CuO4−y superconducting thin films (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 2356-2358 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Superconducting thin films of Nd1.85Ce0.15CuO4−y (NCCO) were grown at 720–820 °C by pulsed laser deposition in N2O atmosphere. The reduction subsequent to the deposition was found to be critical, and was studied systematically for various temperature, atmosphere, and duration. An ac susceptibility technique was used to stringently characterize the film quality. Very high quality films were made with optimized reduction conditions which showed a Tc(R=0) of 22.4 K, with a transition width of 0.2 K and a Jc (4.2 K) of 8×105/cm2 at zero field. Microwave surface resistance Rs was measured at 9.6 GHz and a value of ∼3 mΩ was obtained at 4.2 K in a 5000 A(ring) thick NCCO film.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108242
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  • 5
    Electronic Resource
    Electronic Resource
    Electrodynamic Parameters of YBa〈sub〉2〈/sub〉Cu〈sub〉3〈/sub〉O〈sub〉y〈/sub〉 (1993)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 137-139 (Aug. 1993), p. 59-84 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/00/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.137-139.59.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Magnetic penetration depth measurements in cuprate superconductors (1992)
    Springer
    Journal of superconductivity 5 (1992), S. 395-402 
    Details
    ISSN: 1572-9605
    Keywords: Magnetic penetration depth ; surface impedance ; cuprate superconductors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We examine recent results on measurements of the magnetic penetration depth in cuprate superconductors, with particular emphasis on our results obtained with the microstrip and parallel-plate resonator techniques. The results show that the magnetic penetration depth temperature dependence in YBa2Cu3O7−δ is not consistent with a simple scaled weak-coupled BCS temperature dependence. We present three classes of interpretations of these measurements, and how they relate to other experimental studies of the cuprates. Finally, these interpretations are discussed in terms of some theories of cuprate superconductivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00618140
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  • 7
    Electronic Resource
    Electronic Resource
    Surface impedance measurements of cuprate superconductors: Nd1.85.85Ce0.15CuO4−δ —A case study (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 453-458 
    Details
    ISSN: 1572-9605
    Keywords: Surface impedance ; Nd-Ce-Cu-O ; surface resistance ; magnetic penetration depth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We present results on the temperature dependence of the surface impedance of high-quality thin films and single crystals of the electron-doped Nd1.85Ce0.15CuO4−δ cuprate superconductor. Surprisingly, these measurements are consistent with the behavior of ans-wave BCS superconductor. We also briefly review some highlights of surface impedance measurements on hole-doped cuprate superconductors, and contrast those with the results on Nd,1.85Ce0.15CuO4−δ.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00724588
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  • 8
    Electronic Resource
    Electronic Resource
    Pairing symmetry and electrodynamics of superconducting YBa2Cu3O7−δ, Nd1.85Ce0.15Ce0.15CuO4, and Nb (1995)
    Springer
    Journal of superconductivity 8 (1995), S. 743-748 
    Details
    ISSN: 1572-9605
    Keywords: Surface impedance ; pairing symmetry ; penetration depth ; d-wave
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We experimentally investigate the pairing symmetry and electrodynamics of YBa2Cu3O7−δ (YBCO), Nd1.852Ce0.152CuO4 (NCCO), and Nb by examining the temperature dependence of the penetration depthλ(T) and surface resistanceR s (T) in a comparative manner. Using the measuredλ(T) andR s (T), we extract the complex conductivityσ=σ 1−iσ2 for each sample, and the quasiparticle scattering timeΤ(T) for theab-plane andc-axis in YBCO. While NCCO and Nb show a strong resemblance in their electrodynamic properties, the electrodynamic properties of YBCO are very distinctive from the others. The results suggest that NCCO may have a BCSs-wave-like pairing state, while YBCO possibly has an unconventional pairing state. We compare the results on YBCO with thed-wave pairing scenario, as well as with other possible theoretical models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00727497
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