Abstract
The authors present the gradual orbital switching from leg-directed orbital order to rung-directed orbital order in the iron-based ladder superconductor BaFe${}_{2}$S${}_{3}$ using field-angle resolved magnetoresistance and elastoresistance measurements.
Highlights
The discovery of low-dimensional superconductivity in iron-based ladder compounds provides an alternative point of view in the study of iron-based superconductors [1]
We find that MR anisotropy and ER nematic response are both suppressed near T ∗, implying that an orbital order promoting isotropic electronic states is stabilized at T ∗
MR was measured up to 17.5 T and field angle dependence is resolved by using rotating probes in a superconducting magnet with three geometric configurations labeled by G1, G2, and G2’, where magnetic field H is rotated within outof-ladder plane [(001) or xy plane], in-ladder plane [(100) or yz plane], and as-grown plane [(110)-leg plane], respectively
Summary
The discovery of low-dimensional superconductivity in iron-based ladder compounds provides an alternative point of view in the study of iron-based superconductors [1]. Reduced dimensionality changes electronic structures dramatically, and the ground states of iron-based ladder materials show insulating properties in stark contrast to bad metal behaviors in the typical quasi-two dimensional BaFe2As2 (122) system. The ladder materials show insulating behaviors, and the dimensionality may serve as another promising parameter to tune the system to the Mott regime, which gives a route to the study of orbital selective Mott phases. From MR measurements, we can estimate the degree of anisotropy in the order parameter, and in contrast, ER couples to anisotropic electronic instability that corresponds to the nematic fluctuations. Measurements of these two physical values can provide complementary information on the rotational symmetry of the electronic states. Approaching TN far below T ∗, we find the enhancement of nematic fluctuations that are distinctly different from the high-temperature fluctuations, suggesting the presence of competing orbital and magnetic orders in this system
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