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Suche nach „[H.] [Piel]“ hat 4 Publikationen gefunden
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    NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenEuropan Campus Rottal-Inn

    Zeitschriftenartikel

    B. Moenter, M. Getta, Sascha Kreiskott, H. Piel, N. Pupeter, Pouryamout, J.

    High J/sub C/ YBCO films on biaxially textured Ni with oxide buffer layers deposited using evaporation and sputtering techniques

    IEEE Transactions on Appiled Superconductivity, vol. 13, no. 2, pp. 2543-2546

    2003

    DOI: 10.1109/TASC.2003.811843

    Abstract anzeigen

    Epitaxial buffer layers of CeO/sub 2/ and Yttria-stabilized ZrO/sub 2/ (YSZ) have been deposited on biaxially textured nickel substrates using thermal reactive evaporation, electron beam evaporation and rf sputtering. The buffer layers were characterized by XRD, SEM and optical microscopy. YBCO films were deposited by high-pressure dc sputtering on CeO/sub 2//YSZ/CeO/sub 2/ buffered substrates and the resulting superconducting properties were measured inductively. On exclusively evaporated buffer architectures critical current densities of 0.6 MA/cm/sup 2/ (77 K, H = 0 T) were measured. The buffers showed some cracks after YBCO deposition, which we considered to be responsible for the relatively low J/sub c/. Buffer architectures with evaporated CeO/sub 2/ followed by rf sputtering of YSZ and CeO/sub 2/ in oxygen atmosphere remained completely crack free after YBCO deposition. Critical current densities between 1.5 and 2.3 MA/cm/sup 2/ (77 K, H = 0 T) in 460 nm thick YBCO films were obtained reproducibly. The critical temperatures T/sub c/ ranged between 88 and 92 K and the typical width /spl Delta/T/sub c/ of the transition was 1.5 K.

    NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenEuropan Campus Rottal-Inn

    Beitrag (Sammelband oder Tagungsband)

    M. Getta, Sascha Kreiskott, B. Moenter, H. Piel, Pouryamout, J., Wehler, D.

    RABiTS YBCO-Bandleiter

    Teilvorhaben: YBCO-beschichtete Metallbänder für die Magnet- und Energietechnik

    BMBF-Forschungsbericht.

    2003

    NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenEuropan 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.

    NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenEuropan 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.