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Absolute value and temperature dependence of the magnetic penetration depth in Ba(Co0.074Fe0.926)2As2

Oren Ofer, J. C. Baglo, M. D. Hossain, R. F. Kiefl, W. N. Hardy, A. Thaler, H. Kim, M. A. Tanatar, P. C. Canfield, R. Prozorov, G. M. Luke, E. Morenzoni, H. Saadaoui, A. Suter, T. Prokscha, B. M. Wojek, and Z. Salman
Phys. Rev. B 85, 060506(R) – Published 28 February 2012

Abstract

The absolute value and temperature dependence of the in-plane magnetic penetration depth λ have been measured on a single crystal of Ba(Co0.074Fe0.926)2As2 using low-energy muon-spin rotation and microwave cavity perturbation. The magnetic field profiles in the Meissner state are consistent with a local London model beyond a depth of 15 nm. We determine the gap symmetry through measurements of the temperature dependence of the superfluid density which follows a two-gap s-wave model over the entire temperature range below Tc. While the intermediate to high temperature data is well fit by an energy gap model in the BCS-like (weak-coupling) limit, a second smaller gap becomes apparent at low temperatures.

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  • Received 6 February 2012

DOI:https://doi.org/10.1103/PhysRevB.85.060506

©2012 American Physical Society

Authors & Affiliations

Oren Ofer1,*, J. C. Baglo2, M. D. Hossain2, R. F. Kiefl2,3, W. N. Hardy2, A. Thaler4, H. Kim4, M. A. Tanatar4, P. C. Canfield4, R. Prozorov4, G. M. Luke5, E. Morenzoni6, H. Saadaoui6, A. Suter6, T. Prokscha6, B. M. Wojek6,7,†, and Z. Salman6

  • 1TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada V6T 2A3
  • 2Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
  • 3Canadian Institute for Advanced Research, Toronto, Ontario, Canada M5G 1Z8
  • 4Ames Lab and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
  • 5Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1
  • 6Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
  • 7Physik-Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland

  • *oren@triumf.ca
  • Present address: KTH Royal Institute of Technology, ICT Material Physics, Electrum 229, 164 40 Kista, Sweden.

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Vol. 85, Iss. 6 — 1 February 2012

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