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Spectral Evidence for Emergent Order in Ba_{1-x}Na_{x}Fe_{2}As_{2}.

  • Author(s): Yi, M
  • Frano, A
  • Lu, DH
  • He, Y
  • Wang, Meng
  • Frandsen, BA
  • Kemper, AF
  • Yu, R
  • Si, Q
  • Wang, L
  • He, M
  • Hardy, F
  • Schweiss, P
  • Adelmann, P
  • Wolf, T
  • Hashimoto, M
  • Mo, S-K
  • Hussain, Z
  • Le Tacon, M
  • Böhmer, AE
  • Lee, D-H
  • Shen, Z-X
  • Meingast, C
  • Birgeneau, RJ
  • et al.

We report an angle-resolved photoemission spectroscopy study of the iron-based superconductor family, Ba_{1-x}Na_{x}Fe_{2}As_{2}. This system harbors the recently discovered double-Q magnetic order appearing in a reentrant C_{4} phase deep within the underdoped regime of the phase diagram that is otherwise dominated by the coupled nematic phase and collinear antiferromagnetic order. From a detailed temperature-dependence study, we identify the electronic response to the nematic phase in an orbital-dependent band shift that strictly follows the rotational symmetry of the lattice and disappears when the system restores C_{4} symmetry in the low temperature phase. In addition, we report the observation of a distinct electronic reconstruction that cannot be explained by the known electronic orders in the system.

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