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

Abstract

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 AE=Ca these fluctuations start below $T_S$. Co doping preserves the orbital fluctuations while K doping suppresses it. The fluctuations are only seen at those dopings and temperatures where an in-plane resistive anisotropy is known to exist. We predict an in-plane resistive anisotropy of $\mathrm{F}{\mathrm{e}}_{1+\mathrm{y}}\mathrm{Te}$ above $T_S$. Our data are examined in light of the recent work by W.-C. Lee and P. Phillips (arXiv:1110.5917v2). We also study how joule heating in the PCS junctions impacts the spectra. Spectroscopic information is only obtained from those PCS junctions that are free of heating effects while those PCS junctions that are in the thermal regime display bulk resistivity phenomenon.

Accepted for publication in Physical Review B

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