Enhancement of in-field critical current density of BaZrO3 introduced (Y, Gd)BCO coated conductors by TFA-MOD process adopting multiple-coating with reduced once-coat-layer-thickness
鈴木 匠, 大村 俊介, 今村 和孝, 井上 昌睦, 東川 甲平 （九大）； 淡路 智 （東北大）； 中岡 晃一, 和泉 輝郎 （産総研）； 木須 隆暢 （九大）
Abstract:The trifluoroacetate metal-organic decomposition (TFA-MOD) process for REBa2Cu3Oy (RE: rare earth, REBCO) coated conductors is a low-cost process to provide high critical current density Jc because of its non-vacuum process. Recently, it has been reported that the critical current density (Jc) in liquid nitrogen temperature can be increased effectively by reducing once-coat-layer-thickness in the multiple coating process of BaZrO3 (BZO) doped MOD-YGdBCO coated conductors. In this study, we have investigated the Jc 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 Jc 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. The sample using the 30 nm once-coat-layer-thickness shows superior in-field Jc in the all measured conditions than that of the standard coating using 170 nm thick layer for each coating.