Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-12-27
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 4 Figures (low-res), Submitted December 2009
Scientific paper
We present a polarization and topology resolved study of the low energy band structure in optimally doped superconducting Ba0.6K0.4Fe2As2 using angle resolved photoemission spectroscopy. Polarization-contrasted measurements allow us to identify and trace all low energy bands expected in models, revealing unexpected symmetry breaking and a surprisingly intertwined Fermi surface topology of hole-like bands near the Brillouin zone center. Band structure correlations across the Gamma-M spin fluctuation wavevector are compared with the superconducting gap anisotropy which suggest a partial scenario for spin-mediated interband instability contributing to superconductivity in the hole doped regime.
Chen Guo-Feng
Hasan Zahid Md.
Hsieh David
Luo Jian-Lin
Qian Dajun
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