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

doi:10.1103/PhysRevB.85.214515

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

Chemistry

Research output: Contribution to journal › Article › peer-review

42 Scopus citations

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 language	English (US)
Article number	214515
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	85
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevB.85.214515
State	Published - 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), Article 214515. https://doi.org/10.1103/PhysRevB.85.214515

@article{5b5bdbc8067c44f7a86f630870ffcce7,

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 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.",

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

year = "2012",

month = jun,

day = "18",

doi = "10.1103/PhysRevB.85.214515",

language = "English (US)",

volume = "85",

journal = "Physical Review B - Condensed Matter and Materials Physics",

issn = "1098-0121",

publisher = "American Physical Society",

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}

Arham, HZ, Hunt, CR, Park, WK, Gillett, J, Das, SD, Sebastian, SE, Xu, ZJ, Wen, JS, Lin, ZW, Li, Q, Gu, G, Thaler, A, Ran, S, Bud'Ko, SL, Canfield, PC, Chung, DY, Kanatzidis, MG & Greene, LH 2012, 'Detection of orbital fluctuations above the structural transition temperature in the iron pnictides and chalcogenides', Physical Review B - Condensed Matter and Materials Physics, vol. 85, no. 21, 214515. https://doi.org/10.1103/PhysRevB.85.214515

TY - JOUR

T1 - Detection of orbital fluctuations above the structural transition temperature in the iron pnictides and chalcogenides

AU - Arham, H. Z.

AU - Hunt, C. R.

AU - Park, W. K.

AU - Gillett, J.

AU - Das, S. D.

AU - Sebastian, S. E.

AU - Xu, Z. J.

AU - Wen, J. S.

AU - Lin, Z. W.

AU - Li, Q.

AU - Gu, G.

AU - Thaler, A.

AU - Ran, S.

AU - Bud'Ko, S. L.

AU - Canfield, P. C.

AU - Chung, D. Y.

AU - Kanatzidis, M. G.

AU - Greene, L. H.

PY - 2012/6/18

Y1 - 2012/6/18

N2 - 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.

AB - 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.

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ER -

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

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