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London penetration depth in single crystals of Ba(Fe1xCox)2As2 spanning underdoped to overdoped compositions

R. T. Gordon, C. Martin, H. Kim, N. Ni, M. A. Tanatar, J. Schmalian, I. I. Mazin, S. L. Bud’ko, P. C. Canfield, and R. Prozorov
Phys. Rev. B 79, 100506(R) – Published 24 March 2009

Abstract

The London penetration depth λ(T) has been measured in single crystals of Ba(Fe1xCox)2As2 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, Δλ(T)Tn, 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.

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  • Received 21 December 2008

DOI:https://doi.org/10.1103/PhysRevB.79.100506

©2009 American Physical Society

Authors & Affiliations

R. T. Gordon1, C. Martin1, H. Kim1, N. Ni1, M. A. Tanatar1, J. Schmalian1, I. I. Mazin2, S. L. Bud’ko1, P. C. Canfield1, and R. Prozorov1,*

  • 1Department of Physics and Astronomy and Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA
  • 2Code 6393, Naval Research Laboratory, Washington, D.C. 20375, USA

  • *Corresponding author; prozorov@ameslab.gov

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Vol. 79, Iss. 10 — 1 March 2009

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