Anomalous independence of interface superconductivity from carrier density

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	Anomalous independence of interface superconductivity from carrier density
	Wu, J ; Pelleg, O ; Logvenov, G ; Bollinger, AT ; Sun, YJ ; Boebinger, GS ; Vanevic, M ; Radovic, Z ; Bozovic, I
刊名	NATURE MATERIALS
	2013
卷号	12 期号:10 页码:877
ISSN号	1476-1122
通讯作者	Bozovic, I (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA.
中文摘要	The recent discovery of superconductivity at the interface of two non-superconducting materials has received much attention(1-12). In cuprate bilayers, the critical temperature (T-c) can be significantly enhanced compared with single-phase samples(2,7,9). Several explanations have been proposed, invoking Sr interdiffusion(2), accumulation and depletion of mobile charge carriers(2,8,10), elongation of the copper-to-apicaloxygen bond length(11,12), or a beneficial crosstalk between a material with a high pairing energy and another with a large phase stiffness(13-16). From each of these models, one would predict Tc to depend strongly on the carrier density in the constituent materials. Here, we study combinatorial libraries of La2-xSrxCuO4-La2CuO4 bilayer samples-an unprecedentedly large set of more than 800 different compositions. The doping level x spans a wide range, 0 : 15 < x < 0 : 47, and the measured Hall coefficient varies by one order of magnitude. Nevertheless, across the entire sample set, T-c stays essentially constant at about 40 K. We infer that doping up to the optimum level does not shift the chemical potential, unlike in ordinary Fermi liquids. This result poses a new challenge to theory-cuprate superconductors have not run out of surprises.
语种	英语
公开日期	2014-01-16
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/56782]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Wu, J,Pelleg, O,Logvenov, G,et al. Anomalous independence of interface superconductivity from carrier density[J]. NATURE MATERIALS,2013,12(10):877.
APA	Wu, J.,Pelleg, O.,Logvenov, G.,Bollinger, AT.,Sun, YJ.,...&Bozovic, I.(2013).Anomalous independence of interface superconductivity from carrier density.NATURE MATERIALS,12(10),877.
MLA	Wu, J,et al."Anomalous independence of interface superconductivity from carrier density".NATURE MATERIALS 12.10(2013):877.