Momentum and Orbital Selective Nematicity in an Iron-based Superconductor

The emergence of unconventional superconductivity in proximity to intertwined electronic orders is especially relevant in the case of iron-based superconductors. The general picture suggests that one can suppress the dynamic fluctuations residing in the phase diagram where the chemical doping is at the optimal by applying a conjugate field. P. Malinowski et al. [1] showed that continuously tuned uniaxial strain can gradually suppress the nematic fluctuations and suppress superconducting T_c effectively. However, the underlying microscopic mechanism for this phenomenon remains elusive. In this research, we use ARPES with in-situ uniaxial strain capability to investigate the momentum and orbital selectivity of nematicity in optimal doped BaFe2(AsxP1-x)2 to provide insights into this matter.

[1] Nat. Phys. 16, 1189-1193 (2020)