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  • 1
    Electronic Resource
    Electronic Resource
    Electric field dependence of the screening currents in the mixed state of high temperature superconductors investigated by an ac technique (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 4749-4753 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The influence of the electric field on the shielding currents of melt textured YBa2Cu3O7−δ superconductors was investigated by low frequency ac magnetization measurements. The electric field was varied by changing the amplitude as well as the frequency of the applied ac field. These two dependencies were found to be consistent with each other and allowed to develop a method for the derivation of the E(J) characteristic of the superconductor from these measurements. E(J) was found to follow approximately a power law with an exponent, which decreases monotonically with increasing magnetic dc field. The results are compared with dc magnetization measurements, where the corresponding electric field is lower by up to four orders of magnitude. We find convincing agreement between the dc shielding currents and their relaxation and the current–voltage characteristic derived from the ac technique. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1308071
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  • 2
    Electronic Resource
    Electronic Resource
    Very high trapped fields in neutron irradiated and reinforced YBa2Cu3O7−δ melt-textured superconductors (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 81 (2002), S. 868-870 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on very high trapped fields (13.3 T at 33 K) achieved in bulk YBa2Cu3O7−δ melt-textured monoliths, which were reinforced by steel tubes to compensate the tensile stress generated during activation. The flux pinning properties were improved by neutron irradiation. The resulting increase of the critical current density shifts the maximum attainable trapped fields to higher temperatures (by about 10 K). © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1497705
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    Paper (German National Licenses)
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