Evidence of a Spin Resonance Mode in the Iron-Based SuperconductorBa0.6K0.4Fe2As2from Scanning Tunneling Spectroscopy

2012/05/02 by Lei Shan, Jing Gong, Yong-Lei Wang +9
Business, Management and Accounting · Materials Science · Physics and Astronomy · #Atomic physics #Condensed matter physics #Excitation #Inelastic neutron scattering #Intellectual Capital and Performance Analysis #Iron-based superconductors research #Materials science #Neutron #Neutron scattering #Nuclear physics #Nuclear quadrupole resonance #Physics #Quantum mechanics #Quasiparticle #Resonance (particle physics) #Spin (aerodynamics) #Superconductivity #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.108.227002

published as Phys. Rev. Lett. 108, 227002 (2012) · 5 pages, 4 figures, accepted by PRL

arxiv created 2012/05/02 · openalex publication_date 2012/05/31 · arxiv updated 2012/06/04 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We used high-resolution scanning tunneling spectroscopy to study the hole-doped iron pnictide superconductor Ba_0.6K_0.4Fe₂As₂ (T_c=38 K). Features of a bosonic excitation (mode) are observed in the measured quasiparticle density of states. The bosonic features are intimately associated with the superconducting order parameter and have a mode energy of \ensuremath∼14 meV, similar to the spin resonance measured by inelastic neutron scattering. These results indicate a strong electron-spin excitation coupling in iron pnictide superconductors, similar to that in high-T_c copper oxide superconductors.

Citations

• Interplay of electron–lattice interactions and superconductivity in Bi2Sr2CaCu2O8+δ
• A Relation between the Resonance Neutron Peak and ARPES Data in Cuprates
• Ab initiolattice dynamics simulations and inelastic neutron scattering spectra for studying phonons inBaFe2As2: Effect of structural phase transition, structural relaxation, and magnetic ordering
• Superconductivity at 43 K in SmFeAsO1-xF x
• The effect of collective spin-1 excitations on electronic spectra in high-Tcsuperconductors
• Superconductivity at 25 K in hole-doped (La 1-x Sr x )OFeAs
• Theory of Superconductivity
• Scanning Tunneling Spectroscopy and Vortex Imaging in the Iron Pnictide SuperconductorBaFe1.8Co0.2As2
• Measurement of a Sign-Changing Two-Gap Superconducting Phase in Electron-DopedBa(Fe1−xCox)2As2Single Crystals Using Scanning Tunneling Spectroscopy
• Bosons in high-temperature superconductors: an experimental survey
• Observation of Fermi-surface–dependent nodeless superconducting gaps in Ba 0.6 K 0.4 Fe 2 As 2
• Antiferromagnetic spin fluctuation and superconductivity
• Superconductivity at 38 K in the Iron Arsenide(Ba1−xKx)Fe2As2