London penetration depth in single crystals of Ba(Fe1-xCox)2As2 spanning underdoped to overdoped compositions

被引：89

作者：

Gordon, R. T. ^{[1
,3
]}

Martin, C. ^{[1
,3
]}

Kim, H. ^{[1
,3
]}

Ni, N. ^{[1
,3
]}

Tanatar, M. A. ^{[1
,3
]}

Schmalian, J. ^{[1
,3
]}

Mazin, I. I. ^{[2
]}

Bud'ko, S. L. ^{[1
,3
]}

Canfield, P. C. ^{[1
,3
]}

Prozorov, R. ^{[1
,3
]}

机构：

[1] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

[2] USN, Res Lab, Washington, DC 20375 USA

[3] Iowa State Univ, Ames Lab, Code 6393, Ames, IA 50011 USA

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 10期

关键词：

barium compounds; carrier density; cobalt compounds; doping profiles; iron compounds; penetration depth (superconductivity); SUPERCONDUCTOR;

D O I：

10.1103/PhysRevB.79.100506

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The London penetration depth lambda(T) has been measured in single crystals of Ba(Fe1-xCox)(2)As-2 using the tunnel diode resonator technique. The measured doping levels of x=0.038, 0.047, 0.058, 0.074, and 0.10 range from underdoped to overdoped concentrations. The measurements have shown that the density of carriers participating in superconductivity decreases sharply in the underdoped regime but the penetration depth as a function of temperature exhibits a robust power law, Delta lambda(T)similar to T-n, for all measured dopings with n being about 2 in underdoped samples and 2.5 in overdoped samples. We discuss the implications of these results and possible interpretations of such a robust behavior.

引用

页数：4

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