Infrared and optical properties of pure and cobalt-doped LuNi2B2C

M. Windt, J. J. McGuire, T. Rõõm, A. Pronin, T. Timusk, I. R. Fisher, and P. C. Canfield
Phys. Rev. B 65, 064506 – Published 9 January 2002
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Abstract

We present optical conductivity data for Lu(Ni1xCox)2B2C over a wide range of frequencies and temperatures for x=0 and 0.09. Both materials show evidence of being good Drude metals with the infrared data in reasonable agreement with dc resistivity measurements at low frequencies. An absorption threshold is seen at approximately 700 cm1. In the cobalt-doped material, we see a superconducting gap in the conductivity spectrum with an absorption onset at 24±2cm1=3.9±0.4kBTc suggestive of weak to moderately strong coupling. The pure material is in the clean limit and no gap can be seen. We discuss the data in terms of the electron-phonon interaction and find that it can be fit below 600 cm1 with a plasma frequency of 3.3 eV and an electron-phonon coupling constant λtr=0.33 using an α2F(ω) spectrum fit to the resistivity.

  • Received 20 August 2001

DOI:https://doi.org/10.1103/PhysRevB.65.064506

©2002 American Physical Society

Authors & Affiliations

M. Windt*, J. J. McGuire, T. Rõõm, A. Pronin, and T. Timusk§

  • Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L85 4M1

I. R. Fisher and P. C. Canfield

  • Ames Laboratory, Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011

  • *Present address: II. Physikalisches Institut, Universität zu of Köln, 50937 Köln, Germany.
  • Present address: National Institute of Chemical Physics and Biophysics, 12618 Tallinn, Estonia.
  • Present address: Institute of General Physics, Russian Academy of Sciences, 119991, Moscow, Russia.
  • §Also At: The Canadian Institute of Advanced Research; Electronic address: timusk@mcmaster.ca

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Vol. 65, Iss. 6 — 1 February 2002

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