Impact of thickness on microscopic and macroscopic properties of Fe-Te-Se superconductor thin films

	Impact of thickness on microscopic and macroscopic properties of Fe-Te-Se superconductor thin films
	Zhang N(张念); Wang JO(王嘉鸥); Lei T(雷涛); Liu C(刘晨); Zhang SH(张双红); Qian HJ(钱海杰); Wu R(吴蕊); Zhou H(周华); Kui RX(奎热西); Zhang, N
刊名	AIP ADVANCES
	2015
卷号	5 期号:4 页码:47149
通讯作者	奎热西
英文摘要	A series of iron based Fe-Te-Se superconductor thin films depositing on 0.7wt% Nb-doped SrTiO3 at substrate temperatures in the 250 degrees C-450 degrees C range by pulsed laser ablation of a constituents well defined precursor FeTe0.55Se0.55 target sample. We study the possible growth mechanism and its influence on the superconductor properties. Experimental results indicate the superconductive and non-superconductive properties are modulated only by the thickness of the thin films through the temperature range. The films appear as superconductor whenever the thickness is above a critical value similar to 30nm and comes to be non-superconductor below this value. Relative ratios of Fe to (Te+Se) in the films retained Fe/(Te+Se)<1 for superconductor and Fe/(Te+Se)>1 for non-superconductor no matter what the film growth temperature was. The effect of film growth temperature takes only the role of modulating the ratio of Te/Se and improving crystallinity of the systems. According to the experimental results we propose a sandglass film growth mechanism in which the interfacial effect evokes to form a Fe rich area at the interface and Se or Te starts off a consecutive filling up process of chalcogenide elements defect sides, the process is significant before the film thickness reaches at similar to 30nm. (C) 2015 Author(s).
学科主题	Science & Technology - Other Topics; Materials Science; Physics
类目[WOS]	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied
收录类别	SCI ; EI ; CA
WOS记录号	WOS:000353827700082
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/228553]
专题	高能物理研究所_多学科研究中心
推荐引用方式 GB/T 7714	Zhang N,Wang JO,Lei T,et al. Impact of thickness on microscopic and macroscopic properties of Fe-Te-Se superconductor thin films[J]. AIP ADVANCES,2015,5(4):47149.
APA	张念.,王嘉鸥.,雷涛.,刘晨.,张双红.,...&Ibrahim, K.(2015).Impact of thickness on microscopic and macroscopic properties of Fe-Te-Se superconductor thin films.AIP ADVANCES,5(4),47149.
MLA	张念,et al."Impact of thickness on microscopic and macroscopic properties of Fe-Te-Se superconductor thin films".AIP ADVANCES 5.4(2015):47149.