Campus Units
Physics and Astronomy, Ames Laboratory
Document Type
Article
Publication Version
Published Version
Publication Date
6-1-2012
Journal or Book Title
Physical Review B
Volume
85
Issue
21
First Page
214515
DOI
10.1103/PhysRevB.85.214515
Abstract
We use point-contact spectroscopy (PCS) to probe AEFe2As2 (AE=Ca,Sr,Ba) and Fe1+yTe. For AE=Sr,Ba we detect orbital fluctuations above TS while for AE=Ca these fluctuations start below TS. 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 Fe1+yTe above TS. 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.
Copyright Owner
American Physical Society
Copyright Date
2012
Language
en
File Format
application/pdf
Recommended Citation
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, Sergey L.; Canfield, Paul C.; Chung, D. Y.; Kanatzidis, M. G.; and Greene, L. H., "Detection of orbital fluctuations above the structural transition temperature in the iron pnictides and chalcogenides" (2012). Physics and Astronomy Publications. 641.
https://lib.dr.iastate.edu/physastro_pubs/641
Comments
This article is published as Arham, H. Z., C. R. Hunt, W. K. Park, J. Gillett, S. D. Das, S. E. Sebastian, Z. J. Xu et al. "Detection of orbital fluctuations above the structural transition temperature in the iron pnictides and chalcogenides." Physical Review B 85, no. 21 (2012): 214515. DOI: 10.1103/PhysRevB.85.214515. Posted with permission.