Investigation of Magneto-Resistance Behavior in High Pulsed Magnetic Fields up to 35 T of YBa2Cu3O x and YBa2Cu3O x (5% Ag-doped) Thick Films Near 77 K

摘要

We investigated the influence of pulsed magnetic fields of up to 35 T on thick film samples of YBa2Cu3O x (x<6.8) and YBa2Cu3O x (5% Ag-doped), produced from powders on which electromagnetic separation had been performed. It was discovered, that subjecting the thick film samples of YBa2Cu3O x to 10 pulses of a cyclic pulsed magnetic field of 32 T had the effect of significantly increasing T c . The films had an oxygen deficit of 6.6–6.8%. Initially, T c was 74 K. After the treatments by the strong pulses of magnetic fields, T c had increased to 80 K. On the other hand, in YBa2Cu3O x (5% Ag), the processing by strong pulsed magnetic fields will lead to dynamic mechanic stresses, which will increase the amount of tetragonal phases and lead to a lower temperature of the superconductivity transition.