A Strain-ARPES Study: Momentum and Orbital Selective Nematicity in Optimally-doped BaFe2(As0.7P0.3)2

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 dynamical fluctuations when the system is optimally doped by applying a conjugate field. P. Malinowski et al. showed that continuously tuned uniaxial strain can gradually suppress the nematic fluctuations and effectively lower the superconducting Tc [1]. However, the underlying microscopic mechanism remains elusive. Here, we use ARPES with in-situ uniaxial strain capability to investigate the momentum and orbital selectivity of nematicity in BaFe2(As0.7P0.3)2 to provide insights into this matter.

[1] Malinowski, P., Jiang, Q., Sanchez, J.J. et al. Suppression of superconductivity by anisotropic strain near a nematic quantum critical point. Nat. Phys. 16, 1189–1193 (2020).