Optical properties of BaFe2-xCoxAs2

E. van Heumen; Y. Huang; S. de Jong; A. B. Kuzmenko; M. S. Golden; D. van der Marel

doi:10.1209/0295-5075/90/37005

All issues

Volume 90 / No 3 (May 2010)

EPL, 90 3 (2010) 37005

Abstract

Issue		EPL Volume 90, Number 3, May 2010


Article Number		37005
Number of page(s)		5
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/90/37005
Published online		01 June 2010

EPL, 90 (2010) 37005

Optical properties of BaFe_2-xCo_xAs₂

E. van Heumen¹^,2, Y. Huang², S. de Jong², A. B. Kuzmenko¹, M. S. Golden² and D. van der Marel¹

¹ Département de Physique de la Matière Condensée, Université de Genève - quai Ernest-Ansermet 24, CH1211, Genève 4, Switzerland
² Van der Waals-Zeeman Institute, University of Amsterdam - NL-1018XE Amsterdam, The Netherlands, EU

Corresponding author: e.vanheumen@uva.nl

Received: 4 December 2009
Accepted: 3 May 2010

Abstract

We present detailed temperature-dependent optical data on BaFe_2-xCo_xAs₂ (BCFA), with x = 0.14, between 4 meV and 6.5 eV. We analyze our spectra to determine the main optical parameters and show that in this material the interband conductivity already starts at energies as low as 10 meV. We determine the superfluid density ρ_s/(2πc)² = 2.2±0.5 $\cdot$ 10⁷ cm^-2, which places optimally doped BFCA close to the Uemura line. Our experimental data shows clear signs of a superconducting gap with 2Δ₁ = 6.2±0.8 meV. In addition, from comparing the experimental spectra to model calculations we obtain indications for an additional band of strongly scattered carriers with a larger gap, 2Δ₂ = 14±2 meV.

PACS: 74.25.Gz – Optical properties / 74.25.-q – Properties of superconductors / 74.70.Xa – Pnictides and chalcogenides

© EPLA, 2010

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