基板自己加熱方式によるPulsed Laser Deposition 法を用いたYBa₂Cu₃O_yの厚膜化及び磁場中超伝導特性

抄録

We fabricated YBa2Cu3Oy (YBCO)coated conductors (CCs) 0.4 - 8.6 μm in thickness on Hastelloy metal substrates with oxide-textured layers, including IBAD-MgO, which were heated by a self-heating technique (SHT) using the pulsed laser deposition method. The substrate temperature (T_s) measured with a thermocouple or pyrometer was feedback-controlled (FBC) during deposition. It was possible to suppress a-axis grains even in a thick when using the SHT. The critical current (I_c) of the YBCO CCs with a thickness of 4.9 μm reached 1080 A/cm-w at 77 K and in a self-field. In addition, 3.0 - 9.0 vol.%BHO-doped YBCO CCs with a thickness of 3.0 μm were fabricated using pyrometer FBC. The I_c in a magnetic field at 77 K was optimized by adding 3.0 vol.%BHO.