Detection of orbital fluctuations above the structural transition temperature in the iron pnictides and chalcogenides

H. Z. Arham*, C. R. Hunt, W. K. Park, J. Gillett, S. D. Das, S. E. Sebastian, Z. J. Xu, J. S. Wen, Z. W. Lin, Q. Li, G. Gu, A. Thaler, S. Ran, S. L. Bud'Ko, P. C. Canfield, D. Y. Chung, M. G. Kanatzidis, L. H. Greene

*Corresponding author for this work

Research output: Contribution to journalArticle

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Abstract

We use point-contact spectroscopy (PCS) to probe AEFe 2As 2 (AE=Ca,Sr,Ba) and Fe 1+yTe. For AE=Sr,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 Fe 1+yTe above T S. Our data are examined in light of the recent work by Lee and 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 phenomena.

Original languageEnglish (US)
Article number214515
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number21
DOIs
StatePublished - Jun 18 2012

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Arham, H. Z., Hunt, C. R., Park, W. K., Gillett, J., Das, S. D., Sebastian, S. E., Xu, Z. J., Wen, J. S., Lin, Z. W., Li, Q., Gu, G., Thaler, A., Ran, S., Bud'Ko, S. L., Canfield, P. C., Chung, D. Y., Kanatzidis, M. G., & Greene, L. H. (2012). Detection of orbital fluctuations above the structural transition temperature in the iron pnictides and chalcogenides. Physical Review B - Condensed Matter and Materials Physics, 85(21), [214515]. https://doi.org/10.1103/PhysRevB.85.214515