Low-energy interband transitions in the infrared response of Ba(Fe1-xCox)2As2

Abstract

We studied the doping and temperature (T) dependence of the infrared (IR) response of Ba(Fe1-xCox)2As2 single crystals. We show that a weak band around 1000 cm-1, that was previously interpreted in terms of interaction of the charge carriers with magnetic excitations or of a pseudogap, is rather related to low-energy interband transitions. Specifically, we show that this band exhibits a similar doping and T-dependence as the hole pockets seen by angle resolved photoemission spectroscopy (ARPES). Notably, we find that it vanishes as a function of doping near the critical point where superconductivity is suppressed in the overdoped regime. Our IR data thus provide bulk specific information (complementary to the surface sensitive ARPES) for a Lifshitz transition. Our IR data also reveal a second low-energy band around 2300 cm-1 which further emphasizes the necessity to consider the multiband nature of these iron arsenides in the analysis of the optical response.

5 pages, 3 figures

References in corpus (22)

• Superconductivity at 43 K in Samarium-arsenide Oxides $SmFeAs{O}_{1-x}{F}_x$
• High-temperature superconductivity in iron-based materials
• LaFeAsO${}_{1-x}$F${}_x$: A low carrier density superconductor near itinerant magnetism
• Strong electronic correlations from Hund's coupling
• Electrodynamics of Correlated Electron Materials
• Magnetism and Charge Dynamics in Iron Pnictides
• Origin of the spin density wave instability in AFe${}_2$As${}_2$ (A=Ba, Sr) as revealed by optical spectroscopy
• Unconventional electronic reconstruction in undoped (Ba,Sr)Fe${}_2$As${}_2$ across the spin density wave transition
• Importance of Fermi surface topology for high temperature superconductivity in electron-doped iron arsenic superconductors
• Evolution of the optical spectrum with doping in iron pnictides Ba(Fe1-xCox)2As2
• On the multi-orbital band structure and itinerant magnetism of iron-based superconductors
• Optical determination of the relation between the electron-boson coupling function and the critical temperature in high T${}_c$ cuprates
• Optical properties of the iron-arsenic superconductor BaFe1.85Co0.15As2
• Coexistence and competition of magnetism and superconductivity on the nanometer scale in underdoped BaFe1.89Co0.11As2
• Infrared Measurement of the Pseudogap in P-Doped and Co-Doped BaFe2As2 High-Temperature Superconductors
• Muon spin rotation study of magnetism and superconductivity in Ba(Fe1-xCox)2As2 single crystals
• Optical conductivity and Raman scattering of iron superconductors
• Extended Drude model and role of interband transitions in the mid-infrared spectra of pnictides
• Theoretical Investigation of Optical Conductivity in Ba [Fe(1-x)Co(x)]2 As2
• Transport and magnetic properties of La-doped CaFe${}_2$As${}_2$
• Doping-Dependent and Orbital-Dependent Band Renormalization in Ba(Fe_1-xCo_x)_2As_2 Superconductors
• Manifestation of pseudogap in ab-plane optical characteristics

Cited by in corpus (18)

• Optical conductivity of iron-based superconductors
• Infrared study of the spin reorientation transition and its reversal in the superconducting state in underdoped Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• On infrared pseudogap in cuprate and pnictide high-temperature superconductors
• Direct observation of a Fermi liquid-like normal state in an iron-pnictide superconductor
• Correlation, doping and interband effects on the optical conductivity of iron superconductors
• Muon spin rotation and infrared spectroscopy study of magnetism and superconductivity in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Spectral weight transfer in strongly correlated Fe${}_{1.03}$Te
• Optical properties and electronic structure of the nonmetallic metal FeCrAs
• Electron-boson spectral density function of correlated multiband systems obtained from optical data: Ba0.6K0.4Fe2As2 and LiFeAs
• Muon spin rotation and infrared spectroscopy study of $B{a}_{1-x}N{a}_{x}F{e}_{2}A{s}_2$
• Coexistence of Clean- and Dirty-limit Superconductivity in LiFeAs
• Formation of As-As Bond and Its Effect on Absence of Superconductivity in Collapsed Tetragonal Phase of Ca0.86Pr0.14Fe2As2 : An Optical Spectroscopy Study
• Optical properties of superconducting EuFe2(As1-xPx)2
• Constraints on the total coupling strength to bosons in iron based superconductors
• Scaling of the Fano effect of the in-plane Fe-As phonon and the superconducting critical temperature in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Electronic Scattering Effects in Europium-Based Iron Pnictides
• Ultrafast dynamics in the Lifshitz-type 5$d$ pyrochlore antiferromagnet Cd${}_2$Os${}_2$O${}_7$
• Magnetotransport properties in the magnetic phase of BaFe${}_{2-x}$T${}_x$As${}_2$ (T = Co,Ni): A magnetic excitations approach