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Probing Dynamics And Pinning Of Single Vortices In Superconductors At Nanometer Scales, L. Embon, Y. Anahory, A Suhov, D. Halbertal, J. Cuppens, A. Yakovenko, A. Uri, Y. Myasoedov, M. L. Rappaport, M. E. Huber, A. Gurevich, E. Zeldov
Probing Dynamics And Pinning Of Single Vortices In Superconductors At Nanometer Scales, L. Embon, Y. Anahory, A Suhov, D. Halbertal, J. Cuppens, A. Yakovenko, A. Uri, Y. Myasoedov, M. L. Rappaport, M. E. Huber, A. Gurevich, E. Zeldov
Physics Faculty Publications
The dynamics of quantized magnetic vortices and their pinning by materials defects determine electromagnetic properties of superconductors, particularly their ability to carry non-dissipative currents. Despite recent advances in the understanding of the complex physics of vortex matter, the behavior of vortices driven by current through a multi-scale potential of the actual materials defects is still not well understood, mostly due to the scarcity of appropriate experimental tools capable of tracing vortex trajectories on nanometer scales. Using a novel scanning superconducting quantum interference microscope we report here an investigation of controlled dynamics of vortices in lead films with sub-Angstrom spatial resolution …
Composition Dependence Of The In-Plane Cu-O Bond-Stretching Lo Phonon Mode In Yba₂Cu₃O₆₊ₓ, F. Stercel, T. Egami, H. A. Mook, M. Yethiraj, M. Arai, C. Frost, Fatih Dogan, J. H. Chung
Composition Dependence Of The In-Plane Cu-O Bond-Stretching Lo Phonon Mode In Yba₂Cu₃O₆₊ₓ, F. Stercel, T. Egami, H. A. Mook, M. Yethiraj, M. Arai, C. Frost, Fatih Dogan, J. H. Chung
Materials Science and Engineering Faculty Research & Creative Works
An inelastic pulsed neutron scattering study was performed on the dependence of the dispersion and spectral intensity of the in-plane Cu-O bond-stretching LO phonon mode on doped charge density. The measurements were made in the time-of-flight mode with the multiangle position sensitive spectrometer of the ISIS facility on single crystals of YBa2Cu3O6+x (x=0.15, 0.35, 0.6, 0.7, and 0.95). The focus of the study is the in-plane Cu-O bond-stretching LO phonon mode, which is known for strong electron-phonon coupling and unusual dependence on composition and temperature. It is shown that the dispersions for the samples with x=0.35, 0.6, and 0.7 are …
Microstructure Observations Of Ag And Ag-Alloy Sheathed Bi2223 Tapes, Hua-Kun Liu, R. Zeng
Microstructure Observations Of Ag And Ag-Alloy Sheathed Bi2223 Tapes, Hua-Kun Liu, R. Zeng
Faculty of Engineering - Papers (Archive)
Abstract—37 filament Bi2223 tapes with different configurations of Ag, AgAu7wt% AgSb0.6wt% and AgMg0.2wt% as the precursor and restack sheaths were fabricated using commercial Bi2223 precursor material and powder-in-tube techniques. Short length samples were heat treated at a temperature in the range of 832 C to 846 C for the first stage (HT 1), followed by a second stage (HT 2) at 825 C for 40 h and slow cooled to 785 C. An intermediate roll pass was performed between the heat treatment stages. The critical current (Ic) of the tapes was measured at 77 K in self-field and in fields …
Results Of Ac Loss Tests On Twisted And Untwisted Htsc Tape Exposed To An External Field, T. Hardono, C. Cook, F. Darmann
Results Of Ac Loss Tests On Twisted And Untwisted Htsc Tape Exposed To An External Field, T. Hardono, C. Cook, F. Darmann
Faculty of Engineering - Papers (Archive)
This paper presents the results of magnetic losstests on twisted and untwisted 37 multifilaments tapes exposed to an alternating field at power frequencies. The losses are measured using calorimetric methods, which are capable of measuring losses in short tapes with the accuracy of several microwatts per centimeter of tape. The losses of the tape due to the longitudinal field of the untwisted tape agree well with theoretical calculations. The measurement results on the twisted filament tape, with 50-mm twist pitch, show that the losses are slightly lower than that in the untwisted tape. This is due to the reduction of …
Microstructural Variations With Uranium Compound Doping Of Bi-Sr-Ca-Cu-O/Ag Superconducting Tapes, D. A. Milliken, J. H. Ahn, S X. Dou
Microstructural Variations With Uranium Compound Doping Of Bi-Sr-Ca-Cu-O/Ag Superconducting Tapes, D. A. Milliken, J. H. Ahn, S X. Dou
Faculty of Engineering - Papers (Archive)
Doping of Bi-Sr-Ca-Cu-O based silver sheathed superconducting tapes (BSCCO/Ag) with various uranium compounds was carried out. This work was aimed at minimising the detrimental effects of doping to allow for later irradiation and fission to create columnar defects for strong flux pinning. The effects on the transport current density of BSCCO/Ag of doping with a variety of uranium compounds up to 2 at% was determined. Microstructural changes due to the doping were investigated. Removal of elements from the BSCCO matrix by uranium compound dopants was studied by energy dispersive spectroscopy. It was found that UCa1.5Sr1.5O6 least degraded electrical performance and …