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1

Digitale Medien

Application of a one-port dielectric resonator for measurement of the intermodulation in high temperature superconducting films (2001)

Vopilkin, E. A. ; Panin, A. N. ; Parafin, A. E. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 72 (2001), S. 3328-3331

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: A technique for characterization of intermodulation performance of unpatterned high TC superconducting (HTS) films, based on the application of the resonator with a single coupling probe is proposed. It allows us to sufficiently increase the sensitivity in comparison with the conventional method based on the resonator with two coupling probes. The measurements of the power at mixed frequency as a function of input power are performed for epitaxial HTS films of various surface resistance and thickness. From the experimental data an intermodulation coefficient α is determined, which provides the film intermodulation properties independently on the measuring system. © 2001 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1386897

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2

Digitale Medien

Structure and transport properties of ultrathin YBa2Cu3O7−x films (1996)

Varganov, A. V. ; Vopilkin, E. A. ; Vysheslavtsev, P. P. ; [weitere]

Springer

JETP letters 63 (1996), S. 644-650

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ISSN: 1090-6487

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract The crystal structure and transport properties of epitaxial c-oriented YBa2Cu3O7−x films are investigated for high-T c layer thicknesses from 5 to 300 nm. The films were prepared by laser deposition. Films less than 30 nm thick become predominantly single-domain in the direction of the c axis. As the thickness decreases, the orthorhombicity parameter of the YBaCuO lattice decreases, which correlates with the critical temperature degradation observed in films less than 9 nm thick. The obtained thickness dependence of the effective microwave surface resistance of a YBaCuO film agrees well with the computational result obtained in the framework of local electrodynamics for samples with a constant microwave conductance.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1134/1.567081

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3

Digitale Medien

Intermodulation measurements in YBaCuO films (2000)

Vopilkin, E. A. ; Pavlov, S. A. ; Panin, A. N. ; [weitere]

Springer

Technical physics letters 26 (2000), S. 352-353

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ISSN: 1090-6533

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract A technique for measuring the intermodulation signal arising in a nonlinear high-temperature superconductor film is suggested. Using a one-port resonator, the technique significantly increases sensitivity of the measuring system as compared to that of a two-port-resonator design. Specifically, it lowers the minimum measurable power at a given magnetic field strength on the film surface. Measurements of the intermodulation signal power as a function of the input power for YBaCuO films differing in surface resistance and thickness are reported. Based on the measured data, the intermodulation characteristic magnetic field is computed. The quantity characterizes nonlinear film properties of the regardless of the measuring system employed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1134/1.1262841

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4

Digitale Medien

Intermodulation in a microwave resonator with a high-temperature superconductor (2000)

Vopilkin, E. A. ; Parafin, A. E. ; Reznik, A. N.

Springer

Technical physics 45 (2000), S. 214-220

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ISSN: 1090-6525

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract Intermodulation, or the generation of a combination-frequency signal, is studied theoretically in the case where the nonlinearity is provided by a high-temperature superconductor placed in a microwave resonator. A general formula that relates the power of an intermodulation signal to the electromagnetic performance of the resonator, the physical parameters of the superconductor, and the intensity of pump waves is derived. A parameter that characterizes the nonlinearity is evaluated from data available from the literature. The potentialities of various resonators for the microwave characterization of the nonlinearities in high-temperature superconductors are assessed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1134/1.1259600

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