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Suche nach „[B.] [Mönter]“ hat 3 Publikationen gefunden
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    NachhaltigF: Angewandte Naturwissenschaften und WirtschaftsingenieurwesenF: Europan Campus Rottal-Inn

    Zeitschriftenartikel

    Polak, M., Krempasky, L., Demencik, E., Wehler, D., Sascha Kreiskott, B. Mönter, Polyanskii, A., Larbalestier, D.C., B. Moenter

    Critical currents of narrow YBCO rings on ni and LaAlO/sub 3/ substrates

    IEEE Transactions on Appiled Superconductivity, vol. 13, no. 2, pp. 2595-2598

    2003

    DOI: 10.1109/TASC.2003.811857

    Abstract anzeigen

    Low loss YBCO based flexible conductors for AC operation must have a filamentary structure with filament width below 0.1 mm. MO images of structured YBCO films showed that the flux penetration is less homogeneous in YBCO filaments on Ni substrates than that in filaments on LaAlO, which indicates that the patterning may affect the critical current density in narrow filaments. To see the effect of patterning on the filament critical current we studied I-V curves and critical currents of YBCO rings with various widths ranging from 0.3 mm down to 0.02 mm. The rings were prepared by a standard lithographic process. To avoid problems with current contacts, the current in the rings was induced by external magnetic field and electric field-current characteristics were determined by a Hall probe method.

    NachhaltigF: Angewandte Naturwissenschaften und WirtschaftsingenieurwesenF: Europan Campus Rottal-Inn

    Zeitschriftenartikel

    Sascha Kreiskott, M. Getta, B. Mönter, H. Piel, N. Pupeter

    High JC YBCO films on biaxially textured Ni with oxide buffer layers deposited using evaporation and sputtering techniques

    Physica C: Superconductivity, vol. 383, no. 4, pp. 306-314

    2003

    DOI: 10.1016/S0921-4534(02)01986-X

    Abstract anzeigen

    Epitaxial buffer layers of CeO2 and yttria-stabilised ZrO2 (YSZ) have been deposited on biaxially textured nickel substrates using evaporation and rf sputtering. The buffer layers were characterised by XRD, SEM and optical microscopy. YBa2Cu3O7−δ (YBCO) films were deposited by high pressure dc sputtering on CeO2/YSZ/CeO2 buffered substrates and the resulting superconducting properties were measured inductively. On exclusively evaporated buffers critical current densities of up to 0.6 MA/cm2 (77.3 K, H=0 T) were achieved. The buffer layers showed some cracks after YBCO deposition, which we considered to be responsible for the relatively low JC. In contrast buffer architectures with evaporated CeO2 followed by rf sputtering of YSZ and CeO2 remained completely free of cracks after YBCO deposition. Critical current densities between 1.5 and 2.6 MA/cm2 (77 K, H=0 T) in 400 nm thick YBCO films were obtained reproducibly. The critical temperatures TC ranged between 87 and 92 K and the typical width ΔTC of the transition was 1.5 K.

    NachhaltigF: Angewandte Naturwissenschaften und WirtschaftsingenieurwesenF: Europan Campus Rottal-Inn

    Zeitschriftenartikel

    Hein, M.A., M. Getta, Sascha Kreiskott, B. Mönter, H. Piel, Oates, D.E., Hirst, P.J., Humphreys, R.G., Lee, H.N., Moon, S.H., R.G Humphreys

    Recent developments in the characterization of superconducting films by microwaves

    Physica C: Superconductivity, vol. 372-376, Part 1, no. August, pp. 571-577

    2002

    DOI: 10.1016/S0921-4534(02)00797-9

    Abstract anzeigen

    We describe and analyze selected surface impedance data recently obtained by different groups on cuprate, ruthenate and diboride superconducting films on metallic and dielectric substrates for fundamental studies and microwave applications. The discussion includes a first review of microwave data on MgB2, the weak-link behaviour of RABiTS-type YBa2Cu3O7−δ tapes, and the observation of a strong anomalous power-dependence of the microwave losses in MgO at low temperatures. We demonstrate how microwave measurements can be used to investigate electronic, magnetic, and dielectric dissipation and relaxation in the films and substrates. The impact of such studies reaches from the extraction of microscopic information to the engineering of materials and further on to applications in power systems and communication technology.