High-Ic HoBCO Coated Conductors by PLD Method

Abstract

Ho 1 Ba 2 Cu 3 O x (HoBCO) coated conductors by using Pulsed Laser Deposition (PLD) have been developed on textured Ni-alloy substrates. Hetero-epitaxial growth of CeO 2 YSZ CeO 2 was developed to introduce in-plane alignment for buffer layers. CeO 2 seed and cap layers were deposited by RF sputtering. YSZ diffusion layer was deposited by PLD. The most advantage of buffer layers are high growth rate and large deposition area by using in-plane alignment of textured substrate. This was demonstrated by a high production speed of buffer layers. CeO 2 and YSZ buffer layers show a high production speed of 7 m/h and 8 m/h, respectively. As for the HoBCO deposition, a production speed of 10 m/h was demonstrated by using high growth rate of 4 m min in our PLD process. Ic of the short sample reached 357 A/cm-width at 77 K, 0 T, and 2,423 A/cm-width at 30 T, 4.2 K. Long length HoBCO conductors up to 35 m were performed by using reel to reel tape transfer system of each process. Index Terms-High-superconductor, Ho-123, pulsed laser deposition, thin film.

AC Loss Characteristics of Stacked Conductors Composed of HTS Coated Conductors With Magnetic Substrates

“…3 under self-magnetic fields. The normalized AC transport current losses in the stacked conductors are calculated by the following relation: (1) where is the total transport current losses in the stacked conductors and given by the summation of the transport current losses in the conductors A and B measured as stacked for . and are the critical currents of the conductors A and B.…”

“…I N ORDER to be cost competitive over conventional metal conductors, HTS coated conductors are being processed with various stoichiometries and substrate materials [1], [2]. Particularly, some magnetic substrates are concentrating much attention from the view-point of production cost and processing feasibility of long-length conductors.…”