Novel electronic nematicity in heavily hole-doped iron pnictide superconductors.

ABSTRACT: Electronic nematicity, a correlated state that spontaneously breaks rotational symmetry, is observed in several layered quantum materials. In contrast to their liquid-crystal counterparts, the nematic director cannot usually point in an arbitrary direction (XY nematics), but is locked by the crystal to discrete directions (Ising nematics), resulting in strongly anisotropic fluctuations above the transition. Here, we report on the observation of nearly isotropic XY-nematic fluctuations, via elastoresistance measurements, in hole-doped Ba_1-x Rb _x Fe₂As₂ iron-based superconductors. While for [Formula: see text], the nematic director points along the in-plane diagonals of the tetragonal lattice, for [Formula: see text], it points along

SUBMITTER: Ishida K 

PROVIDER: S-EPMC7104219 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature