Electronic structure reconstruction: the driving force behind the magnetic and structural transitions in NaFeAs

Abstract

The electronic structure of NaFeAs is studied with angle resolved photoemission spectroscopy on high quality single crystals. Large portions of the band structure start to shift around the structural transition temperature, and smoothly evolve as the temperature lowers through the spin density wave transition. Moreover, band folding due to magnetic order emerges around structural transition. Our observation provides direct evidence that the structural and magnetic transitions share the same origin, and are both driven by the electronic structure reconstruction in Fe-based superconductors, instead of Fermi surface nesting.

5 pages, 5 figures

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• Symmetry breaking via orbital-dependent reconstruction of electronic structure in uniaxially strained NaFeAs
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• Electronic Structure Reconstruction across the Antiferromagnetic Transition in TaFe${}_{1.23}$Te${}_3$ Spin Ladder
• Magnetism and Superconductivity in Iron-based Superconductors Decided by Condensed Particle-hole Excitations away from the Fermi Level