Fermi surface of Ba{1-x}KxFe2As2 as probed by angle-resolved photoemission

Abstract

Here we apply high resolution angle-resolved photoemission spectroscopy (ARPES) using a wide excitation energy range to probe the electronic structure and the Fermi surface topology of the Ba1-xKxFe2As2 (Tc = 32 K) superconductor. We find significant deviations in the low energy band structure from that predicted in calculations. A set of Fermi surface sheets with unexpected topology is detected at the Brillouin zone boundary. At the X-symmetry point the Fermi surface is formed by a shallow electron-like pocket surrounded by four hole-like pockets elongated in G-X and G-Y directions.

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Cited by in corpus (6)

• Iron based superconductors: magnetism, superconductivity and electronic structure
• Momentum-resolved superconducting gap in the bulk of Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ from combined ARPES and $\mu$SR measurements
• Symmetry of spin excitation spectra in the tetragonal paramagnetic and superconducting phases of 122-ferropnictides
• ARPES experiment in fermiology of quasi-2D metals (Review Article)
• Spontaneous currents in a superconductor with s+is symmetry
• Displacement and annihilation of Dirac gap-nodes in d-wave iron-based superconductors