Scanning Tunneling Spectroscopy and Vortex Imaging in the Iron Pnictide SuperconductorBaFe1.8Co0.2As2

2008/10/31 by Yi Yin, M. Zech, T. L. Williams +8 · 4 citations
Business, Management and Accounting · Materials Science · Physics and Astronomy · #Coherence length #Condensed matter physics #Corporate Taxation and Avoidance #Iron-based superconductors research #Lattice (music) #Magnetic flux quantum #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Quantum tunnelling #Scanning tunneling spectroscopy #Spectroscopy #Superconductivity #Vortex #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.102.097002

published as Phys. Rev. Lett. 102, 097002 (2009) · 4 pages, 4 figures

arxiv created 2009/03/03 · openalex publication_date 2009/03/03 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We present an atomic resolution scanning tunneling spectroscopy study of superconducting BaFe_1.8Co_0.2As₂ single crystals in magnetic fields up to 9 T. At zero field, a single gap with coherence peaks at \ensuremathΔ=6.25 meV is observed in the density of states. At 9 and 6 T, we image a disordered vortex lattice, consistent with isotropic, single flux quantum vortices. Vortex locations are uncorrelated with strong-scattering surface impurities, demonstrating bulk pinning. The vortex-induced subgap density of states fits an exponential decay from the vortex center, from which we extract a coherence length \ensuremathξ=27.6\ifmmode±\else\textpm\fi2.9 \AA, corresponding to an upper critical field H_c2=43 T.

Citations

• Unconventional Superconductivity with a Sign Reversal in the Order Parameter ofLaFeAsO1−xFx
• Small anisotropy, weak thermal fluctuations, and high field superconductivity in Co-doped iron pnictide Ba(Fe1−xCox)2As2
• STM Studies of the Electronic Structure of Vortex Cores inBi2Sr2CaCu2O8+δ
• A BCS-like gap in the superconductor SmFeAsO0.85F0.15
• Superconductivity at 43 K in SmFeAsO1-xF x
• Anisotropic thermodynamic and transport properties of single-crystallineBa1−xKxFe2As2(x=0and 0.45)
• Interplay of magnetism and high-Tc superconductivity at individual Ni impurity atoms in Bi2Sr2CaCu2O8+δ
• Superconductivity at 22 K in Co-DopedBaFe2As2Crystals
• Superconductivity at 38 K in the Iron Arsenide(Ba1−xKx)Fe2As2

Cited by

• Observation of multiple superconducting gaps in the infrared reflectivity spectra of Ba(Fe0.9Co0.1)2As2
• Evidence for nodal superconductivity in Sr2ScFePO3
• Evidence of a Spin Resonance Mode in the Iron-Based SuperconductorBa0.6K0.4Fe2As2from Scanning Tunneling Spectroscopy
• Vortex lattice and vortex bound states in CsFe2As2 investigated by scanning tunneling microscopy/spectroscopy