Effect of Yb Substitution on Microstructure and Superconducting Properties of Y1−xYbxBa2Cu3O7−δ Films
Effect of Yb Substitution on Microstructure and Superconducting Properties of Y1−xYbxBa2Cu3O7−δ Films
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DOI：
10.1007/s10948-017-4485-7
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发表时间：
2018-01
影响因子：
1.8
通讯作者：
Chunyan Li;H. Suo;S. Ye;Min Liu;Lin Ma;Min Tian;Y. Wang
中科院分区：
文献类型：
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作者：
Chunyan Li;H. Suo;S. Ye;Min Liu;Lin Ma;Min Tian;Y. Wang
本研究旨在提高YBa 2Cu 3 O 7 −δ（YBCO）超导薄膜在强磁场下的临界电流密度（Jc）。采用改进的低氟金属有机物沉积法（LF-MOD）在LaAlO 3衬底上制备了Y1 − xYbxBa 2Cu 3 O 7 −δ（Y1−xYbxBCO）超导薄膜，研究了Yb掺杂对YBCO涂层导体微结构和超导性能的影响。在这项研究中，获得了单相，c轴取向的Y1−xYbxBCO薄膜。Yb掺杂对Y1−xYbxBCO薄膜的临界温度（Tc）和转变宽度（ΔT）影响不大。发现了一个反常现象，即Y1−xYbxBCO薄膜在低场下的Jc小于纯YBCO薄膜的Jc，而在高场下的Jc却远大于未掺杂的YBCO薄膜的Jc.与纯YBCO薄膜相比，Y0.75Yb0.25BCO和Y0.25Yb0.75BCO薄膜在8 T，65 K下的Jc值提高了8倍，这意味着Yb化学取代到Y位可以显著改善Y1−xYbxBCO涂层导体在高磁场下的磁通钉扎。
The purpose of this study was to improve the critical current density (Jc) of YBa2Cu3O7−δ(YBCO) superconducting films at high magnetic fields. Thin Y1−xYbxBa2Cu3O7−δ(Y1−xYbxBCO) superconducting films on LaAlO3substrates were prepared by modified low-fluorine metal organic deposition method (LF-MOD) in order to investigate the effect of Yb substitution on the microstructure and superconducting properties of a YBCO-coated conductor. In this study, single-phased,c-axial-aligned Y1−xYbxBCO films were obtained. Yb doping had a little effect on the critical temperature (Tc) and transition width (ΔT) values of Y1−xYbxBCO films. An abnormal phenomenon was observed that theJcof Y1−xYbxBCO films at low field was smaller than that of the pure YBCO film, but theJcof Y1−xYbxBCO films at high field was much greater than that of the undoped YBCO film. Compared to pure YBCO film, theJcvalues of Y0.75Yb0.25BCO and Y0.25Yb0.75BCO films were enhanced by a factor of 8 at 8 T, 65 K, which meant that chemical substitution of Yb into the Y site could improve flux pinning significantly under the high magnetic field in Y1−xYbxBCO coated conductors.