MAGNETIC RESISTANCE OF YBaCuO, GdBaCuO HTSC TAPES IRRADIATED WITH 1–5 MeV ELECTRONS AND 60Co GAMMA RAYS
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Key words: HTSC tape, YBCO, GdBCO, electron irradiation, 60Co gamma-irradiation, defect ordering, superconducting transition of the second type, magnetoresistance, radiation technologies, pinning centers.Abstrak
Abstract. The article presents Hall effect (80–320 K at magnetic field 0.556 Tesla) data in YBCO, GdBCO microfilm on 276-steel tape with metal coating exposed. The tape samples were irradiated with an electron beam with an energy of 5 MeV at currents of 400 nA and 1 mА with fluences of 1014, 5×1014 and 1015 el/cm2 in air at 273 K and 60Co gamma-quanta of 1.17–1.33 MeV in the dose range 105–106 R at liquid nitrogen (77 K). This irradiation resulted in structure modification of microinterfaces YBCO-AgCu, ten times decrease in the magnetoresistance > Tc, increase in the 2-nd type phase transition steep. Below the radiation damage level of destroying the superconducting state, we found such structure modifications, when magnetic flux pinning centers are generated at the concentration of 1016–1017 cm-3 and both Tc and Jc increase. Such an optimized current vortex state exists in 80–320 K. As irradiation with 1–5 MeV electron and 1.17–1.33 MeV gamma flux do not produce long living radio-nuclides, it is affordable for industrial technology of radiation treatment of long cable by rewinding across the flux.
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