Abstract
Many applications for the superconducting magnets using high critical temperature (Tc) oxide superconductors are expected to operate in the persistent current (PC) mode. For the PC mode operation, the PC switch (PCS) is considered to be an essential device. The following properties are required for the PCS material; high critical current, high normal electric resistance in order to cut off the current flow efficiently through thermal switching, and controlled Tc of about several ten degrees higher than the operating temperature in order to attain a quick switching.The liquid phase epitaxy (LPE) method could provide REBa2Cu3Oy (RE123) thick films with a high critical current density in the superconducting state, a reasonable electric resistivity in the normal state and could control Tc with doping a third element. We studied how to fabricate Zn-doped RE123 LPE films with a meander shape to realize its Tc value of about 40-60 K and high electric resistance in the normal state as persistent current switch materials for operation of the magnet at about 20 K. We also studied controllability of the Tc and the lateral growth length of Zn-doped RE123 LPE films on the BaZrO3 buffer layer to develop the process for fabrication of persistent current switch materials.
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