Effect of Sm/Ba substitution on the J/sub c/ in magnetic field of SmBCO thin films by low temperature growth technique
Effect of Sm/Ba substitution on the J/sub c/ in magnetic field of SmBCO thin films by low temperature growth technique
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Sm/Ba 替代对低温生长 SmBCO 薄膜磁场中 J/sub c/ 的影响
DOI：
10.1109/tasc.2005.848962
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发表时间：
2005
影响因子：
1.8
通讯作者：
M. Mukaida
中科院分区：
文献类型：
--
作者：
M. Miura;M. Itoh;Y. Ichino;Y. Yoshida;Y. Takai;K. Matsumoto;A. Ichinose;S. Horii;M. Mukaida
本文报道了用低温生长技术（LTG）制备的Sm/sub 1+x/Ba/sub 2-x/Cu/sub 3/O/sub y/（SmBCO; x= 0.0 8）薄膜的超导特性。LTG工艺由以下两个步骤组成：在830/spl deg/C下在MgO（100）上沉积种子层，然后在740-780/spl deg/C下在种子层上沉积上层。为了研究SmBCO基质中Sm/Ba组分比波动的影响，我们沉积了具有Sm/Ba组分x=0-0.12的上层。x=0.04和0.08的SmBCO薄膜在77 K下的临界电流密度（J/sub c/）分别为5/spl times/10/sup 6/ A/cm/sup 2/（在0 T下）和1/spl times/10/sup 5/ A/cm/sup 2/（在5 T下）。与x=0.04和0.08的膜相比，x=0.12的膜的J/sub c/下降更急剧。从微观结构分析发现，x=0.12的薄膜主要相为富Sm（Sm/sub 1.1/Ba/sub 1.9/Cu/sub 3/O/sub y/）相，而x=0.04和0.08的薄膜主要相为化学计量比。我们推测x=0.12薄膜在磁场中的低J/sub c/是由于富Sm的SmBCO主相的T/sub c/和不可逆场的低物理量造成的。
We have reported superconducting properties of Sm/sub 1+x/Ba/sub 2-x/Cu/sub 3/O/sub y/ (SmBCO; x=0.08) thin films prepared by the low temperature growth technique (LTG). LTG process is consisted of two steps as follows; a seed layer is deposited at 830/spl deg/C on MgO(100), and then upper layer is deposited at 740-780/spl deg/C on the seed layer. In order to investigate the effect of the fluctuations Sm/Ba composition ratio in the SmBCO matrix, we deposited upper layer with the Sm/Ba composition of x=0-0.12. The SmBCO films with x=0.04 and 0.08 show critical current density (J/sub c/) at 77 K of up to 5/spl times/10/sup 6/ A/cm/sup 2/ under 0 T and 1/spl times/10/sup 5/ A/cm/sup 2/ under 5 T for B//c at 77 K, respectively. The J/sub c/ of x=0.12 film dropped more sharply compared with the cases of x=0.04 and 0.08 films. From the microstructure analysis, it was found that the main phase of x=0.12 film was Sm-rich (Sm/sub 1.1/Ba/sub 1.9/Cu/sub 3/O/sub y/) phase, while that of x=0.04 and 0.08 films was stoichiometry. We speculated that the low-J/sub c/ of x=0.12 film in the magnetic fields was ascribed to the low physical meters of T/sub c/ and irreversibility field of the Sm-rich SmBCO main phase.
DOI：
10.1016/j.physc.2004.01.157
发表时间：
2004-10-01
影响因子：
1.7
作者：
Matsumoto, K;Horide, T;Horii, S
通讯作者：
Horii, S