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首页> 外文期刊>Physica, C. Superconductivity and its applications >Comparison of microstructures of pulsed laser deposited YBa_2Cu_3O_(7-#delta#) thin films using solid-state sintered and modified melt-textured grown targets
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Comparison of microstructures of pulsed laser deposited YBa_2Cu_3O_(7-#delta#) thin films using solid-state sintered and modified melt-textured grown targets

机译：固态烧结和改性熔体生长靶的脉冲激光沉积YBa_2Cu_3O_（7-＃delta＃）薄膜的微观结构比较

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摘要

YBa_2Cu_3O_(7 - #delta#)(YBCO) thin films were deposited by pulsed laser deposition (PLD) using differently prepared targets. The targets were fabricated using both solid-state sintering (SSS) and modified melt-textured growth (MTG) methods. The films deposited from MTG targets had better superconducting properties, such as T_c, #DELTA#T and J_c, than the films deposited from SSS targets. In order to understand the enhanced superconducting properties, the film microstructures were investigated using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). As the laser energy density was increased, the films showed an increase of a-axis outgrowth. However, the observed a-axis outgrowth formation indicated that the deposition using MTG targets would result in a more homogeneous and stable film growth as compared to SSS targets. Also, TEM analysis implied that the film deposited from MTG targets had an enhanced grain connectivity that would reduce weak-link effects in the film. Thus, these microstructural differences of films deposited from MTC targets were considered to result in higher J_c than the films deposited from SSS targets.
机译：使用不同制备的靶材，通过脉冲激光沉积（PLD）沉积YBa_2Cu_3O_（7-δ＃）（YBCO）薄膜。使用固态烧结（SSS）和改进的熔体生长（MTG）方法制造靶。从MTG靶沉积的薄膜比从SSS靶沉积的薄膜具有更好的超导性能，例如T_c，＃DELTA＃T和J_c。为了了解增强的超导性能，使用扫描电子显微镜（SEM）和透射电子显微镜（TEM）研究了薄膜的微观结构。随着激光能量密度的增加，薄膜显示出a轴生长的增加。但是，观察到的a轴外延形成表明，与SSS靶相比，使用MTG靶进行沉积将导致更均匀和稳定的膜生长。此外，TEM分析表明，从MTG靶沉积的薄膜具有增强的晶粒连通性，这将减少薄膜中的弱链接效应。因此，认为从MTC靶沉积的膜的这些微观结构差异导致比从SSS靶沉积的膜更高的J_c。

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