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

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.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Ames Lab., Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1047722
Report Number(s):
IS-J 7729
Journal ID: 1098-0121
DOE Contract Number:  
DE-AC02-07CH11358
Resource Type:
Journal Article
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 85
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Arham, H Z, Hunt, C R, Park, W K, Gillett, J, Das, S D, Sebastian, S E, Xu, Z J, Lin, Z W, Li, Q, Gu, G, Thaler, Alexander, Ran, Sheng, Budko, Serguei 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. United States: N. p., 2012. Web. doi:10.1103/PhysRevB.85.214515.
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Arham, H Z, Hunt, C R, Park, W K, Gillett, J, Das, S D, Sebastian, S E, Xu, Z J, Lin, Z W, Li, Q, Gu, G, Thaler, Alexander, Ran, Sheng, Budko, Serguei L, Canfield, Paul C, Chung, D Y, Kanatzidis, M G, & Greene, L H. Detection of orbital fluctuations above the structural transition temperature in the iron pnictides and chalcogenides. United States. https://doi.org/10.1103/PhysRevB.85.214515
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Arham, H Z, Hunt, C R, Park, W K, Gillett, J, Das, S D, Sebastian, S E, Xu, Z J, Lin, Z W, Li, Q, Gu, G, Thaler, Alexander, Ran, Sheng, Budko, Serguei L, Canfield, Paul C, Chung, D Y, Kanatzidis, M G, and Greene, L H. 2012. "Detection of orbital fluctuations above the structural transition temperature in the iron pnictides and chalcogenides". United States. https://doi.org/10.1103/PhysRevB.85.214515.
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@article{osti_1047722,
title = {Detection of orbital fluctuations above the structural transition temperature in the iron pnictides and chalcogenides},
author = {Arham, H Z and Hunt, C R and Park, W K and Gillett, J and Das, S D and Sebastian, S E and Xu, Z J and Lin, Z W and Li, Q and Gu, G and Thaler, Alexander and Ran, Sheng and Budko, Serguei L and Canfield, Paul C and Chung, D Y and Kanatzidis, M G and Greene, L H},
abstractNote = {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.},
doi = {10.1103/PhysRevB.85.214515},
url = {https://www.osti.gov/biblio/1047722}, journal = {Physical Review B},
number = ,
volume = 85,
place = {United States},
year = {Mon Jun 18 00:00:00 EDT 2012},
month = {Mon Jun 18 00:00:00 EDT 2012}
}
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Journal Article:
https://doi.org/10.1103/PhysRevB.85.214515
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