Epitaxial superconducting GdBa2Cu3O7-δ/Gd2O3 nanocomposite thin films from advanced low-fluorine solutions

被引：29

作者：

Cayado, Pablo ^{[1
]}

Mundet, Bernat ^{[1
]}

Eloussifi, Hichem ^{[1
]}

Valles, Ferren ^{[1
]}

Coll, Mariona ^{[1
]}

Ricart, Susagna ^{[1
]}

Gazquez, Jaume ^{[1
]}

Palau, Anna ^{[1
]}

Roura, Pere ^{[2
]}

Farjas, Jordi ^{[2
]}

Puig, Teresa ^{[1
]}

Obradors, Xavier ^{[1
]}

机构：

[1] CSIC, ICMAB, Inst Ciencia Mat Barcelona, Campus UA Barcelona, E-08193 Barcelona, Catalonia, Spain

[2] Univ Girona, Montilivi Campus,Edif P2, E-17071 Girona, Catalonia, Spain

来源：

SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 2017年 / 30卷 / 12期

基金：

欧盟第七框架计划;

关键词：

GdBCO; low-fluorine solution; chemical solution deposition; nanocomposites; flash-heating process; CRITICAL-CURRENT DENSITY; BA-CU-O; RARE-EARTH; COATED CONDUCTORS; YBA2CU3O7-X; DEPOSITION; TEMPERATURE; FABRICATION; PROGRESS; MECHANISMS;

D O I：

10.1088/1361-6668/aa8ffe

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have employed the CSD method to synthesize GdBCO and GdBCO-Gd2O3 nanocomposite 250-300 nm thin films. For this we have designed a new low-fluorine solution never used before in the synthesis of GdBCO thin films that allows us to reduce the HF release by 80% and increase the reproducibility of the pyrolysis process. The growth of these thin films required a new thermal process to be designed, which we refer to as 'flash-heating', where the heating rate is extremely fast (similar to 600 degrees C min(-1)). The structure and the superconducting properties of the pristine GdBCO films are excellent, showing a (00 1) epitaxial orientation of the GdBCO grains and T-c values that reach 92.8 K, which means an enhancement of more than 1 K with respect to standard YBCO films. The calculated J(c) inside the grains (J(c)(G)) also presents remarkable values: J(c)(G)(5K) similar to 40 MA cm(-2) and J(c)(G)(77 K) similar to 3.3 MA cm(-2). Finally, the GdBCO-Gd2O3 nanocomposites films, with a 20% mol of Gd2O3, exhibit superior superconducting properties and pinning performances with respect to GdBCO pristine films.

引用

页数：12

共 75 条

[1] ROTATIONAL HYSTERESIS LOSSES IN SPUTTERED REBCO FILMS OF DIFFERENT STRUCTURE [J].