Enhancement of in-field critical current density of BaZrO_3 introduced (Y, Gd)BCO coated conductors by TFA-MOD process adopting multiple-coating with reduced once-coat-layer-thickness

摘要

The trifluoroacetate metal-organic decomposition (TFA-MOD) process for REBa_2Cu_3O_y (RE: rare earth, REBCO) coated conductors is a low-cost process to provide high critical current density J_c because of its non-vacuum process. Recently, it has been reported that the critical current density in liquid nitrogen temperature can be increased effectively by reducing once-coat-layer-thickness (d_(once)) in the multiple coating process of BaZrO_3 (BZO) doped MOD-YGdBCO coated conductors [1, 2]. In this study, we have investigated the J_c properties of the BaZrO3 doped YGdBCO coated conductors obtained from the multi-thin-layer-coating process over a wide magnetic field and temperature region and an analytical expression for the J_c as a function T and B has been derived by using percolation transition model. Their superconducting properties were compared with that of previous MOD- and PLD processed REBCO coated conductors.