Observation of multiple superconducting gaps in the infrared reflectivity spectra of Ba(Fe0.9Co0.1)2As2

2011/12/31 by Yu. A. Aleshchenko, A. V. Muratov, V. M. Pudalov +5
Materials Science · Physics and Astronomy · #Infrared #Infrared spectroscopy #Iron-based superconductors research #Rare-earth and actinide compounds #Reflectivity #Spectral line #Superconductivity #Superconductivity in MgB2 and Alloys #cond-mat.supr-con #msc:82D55

paper · pdf · doi:10.1134/s0021364011210028

published as JETP Letters, 2011, Vol. 94, No. 9, pp. 719-722 · 4 pages, 2 figures

openalex publication_date 2012/01/01 · arxiv created 2012/01/11 · arxiv updated 2012/01/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

The results of infrared reflectivity measurements for the iron-based high-temperature superconductor Ba(Fe0.9Co0.1)2As2 are reported. The reflectivity is found to be close to unity at frequencies ω lower than 2Δ/h (2Δ is the superconducting gap and h is Planck’s constant). This is evidence for the s +/− or s +/+ symmetry of the superconducting order parameter in the studied compound. The infrared reflectivity spectra of Ba(Fe0.9Co0.1)2As2 manifest opening of several superconducting gaps at temperatures lower than critical T c .

Citations

• Unconventional Superconductivity with a Sign Reversal in the Order Parameter ofLaFeAsO1−xFx
• Anisotropic spin fluctuations and multiple superconducting gaps in hole-doped Ba 0.72 K 0.28 Fe 2 As 2 : NMR in a single crystal
• Direct observation of the superconducting energy gap in the optical conductivity of the iron pnictide superconductorBa(Fe0.9Co0.1)2As2
• Possible Sign-Reversings-Wave Superconductivity in Co-Doped BaFe2As2Proved by Thermal Transport Measurements
• Scanning Tunneling Spectroscopy and Vortex Imaging in the Iron Pnictide SuperconductorBaFe1.8Co0.2As2
• Observation of Fermi-surface–dependent nodeless superconducting gaps in Ba 0.6 K 0.4 Fe 2 As 2