Effect of BSO addition on Cu-O bond of GdBa 2 Cu 3 O 7-x films with varying thickness probed by extended x-ray absorption fine structure

IF 0.2 Q4 PHYSICS, APPLIED

Progress in Superconductivity and Cryogenics Pub Date : 2016-12-31 DOI:10.9714/PSAC.2016.18.4.001

H. Jeon, J. K. Lee, D. Yang, W. Kang, B. Kang

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Abstract

We investigated the relation between the Cu-O bond length and the superconducting properties of BaSnO 3 (BSO)-added GdBa 2 Cu 3 O 7-x (GdBCO) thin films by using extended x-ray absorption fine structure (EXAFS) spectroscopy. 4 wt.% BaSnO 3 (BSO) added GdBa 2 Cu 3 O 7-x (GdBCO) thin films with varying thickness from 0.2 μm to 1.0 μm were fabricated by using pulsed laser deposition (PLD) method. The transition temperature (T c ) and the residual resistance ratio (RRR) of the GdBCO films increased with increasing thickness up to 0.8 μm, where the crystalline BSO has the highest peak intensity, and then decreased. This uncommon behaviors of T c and RRR are likely to be created by the addition of BSO, which may change the ordering of GdBCO atomic bonds. Analysis from the Cu K -edge EXAFS spectroscopy showed an interesting thickness dependence of ordering behavior of BSO-added GdBCO films. It is noticeable that the ordering of Cu-O bond and the transition temperature are found to show opposite behaviors in the thickness dependence. Based on these results, the growth of BSO seemingly have evident effect on the alteration of the local structure of GdBCO film.

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扩展x射线吸收精细结构探测BSO添加对不同厚度gdba2cu3o7 -x薄膜Cu-O键的影响

利用扩展x射线吸收精细结构(EXAFS)光谱研究了添加了BSO的GdBCO薄膜的Cu-O键长与超导性能的关系。采用脉冲激光沉积(PLD)法制备了厚度在0.2 ~ 1.0 μm之间的4 wt.%添加gdba2cu3o7 -x (GdBCO)的basno3 (BSO)薄膜。GdBCO薄膜的转变温度(T c)和残余电阻比(RRR)随着薄膜厚度的增加而增加，厚度达到0.8 μm时，BSO晶体的峰值强度最高，然后逐渐减小。tc和RRR的这种不寻常的行为可能是由于BSO的加入而产生的，BSO可能会改变GdBCO原子键的顺序。Cu K边EXAFS光谱分析表明，添加bso的GdBCO薄膜的有序行为与厚度有关。值得注意的是，Cu-O键的排列顺序和转变温度在厚度依赖性上表现出相反的行为。基于这些结果，BSO的生长似乎对GdBCO膜的局部结构有明显的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Progress in Superconductivity and Cryogenics PHYSICS, APPLIED-

CiteScore

0.40

自引率

33.30%

发文量

期刊介绍： Progress in Superconductivity and Cryogenics is the official publication of The Korea Institute of Applied Superconductivity and Cryogenics and the Korean Superconductivity Society. It was launched in 1999, and accepts original research articles and review papers on research on superconductivity and related fields of physics, electronic devices, materials science, large-scale applications for magnets, power and energy, and cryogenics. The Journal is published quarterly in March, June, September, and December each year. Supplemental issues are published occasionally. The official title of the journal is ''Progress in Superconductivity and Cryogenics'' and the abbreviated title is ''Prog. Supercond. Cryog.'' All submitted manuscripts are peer-reviewed by two reviewers. The text must be written in English. All the articles in this journal are KCI and SCOPUS as of 2015. The URL address of the journal is http://psac.kisac.org where full text is available. This work was supported by the Korean Federation of Science and Technology Societies grant funded by the Korea government.