Detection of Orbital Fluctuations Above the Structural Transition Temperature in the Iron-Pnictides and Chalcogenides

H. Z. Arham, C. R. Hunt, W. K. Park +15

We use point contact spectroscopy to probe $\mathrm{AEF}{\mathrm{e}}_2\mathrm{A}{\mathrm{s}}_2$ ($\mathrm{AE}=\mathrm{Ca},\mathrm{Sr},\mathrm{Ba}$) and $\mathrm{F}{\mathrm{e}}_{1+\mathrm{y}}\mathrm{Te}$. For $\mathrm{AE}=\mathrm{Sr},\mathrm{Ba}$ we detect orbital fluctuations above $T_S$ while for…