Electronic, magnetic and optical properties of two Fe-based superconductors and related parent compounds

R. Jin; M. H. Pan; X. B. He; Guorong Li; De Li; Ru Wen Peng; J. R. Thompson; B. C. Sales; A. S. Sefat; M. A. McGuire; D. Mandrus; J. F. Wendelken; V. Keppens; E. W. Plummer

doi:10.1088/0953-2048/23/5/054005

Electronic, magnetic and optical properties of two Fe-based superconductors and related parent compounds

R. Jin, M. H. Pan, X. B. He, Guorong Li, De Li, Ru Wen Peng, J. R. Thompson, B. C. Sales, A. S. Sefat, M. A. McGuire, D. Mandrus, J. F. Wendelken, V. Keppens, E. W. Plummer

Correlated Electron Materials

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Abstract

We have investigated the electronic, magnetic, and optical properties of two Fe-based superconductors and related parent compounds via three powerful techniques: scanning tunneling microscopy/spectroscopy (STM/S), high-temperature vibrating sample magnetometry, and optical transmission spectroscopy (OTS). Below the superconducting transition temperature T_c ∼ 48K, the STM/S of polycrystalline NdFeAsO_0.86F_0.14 reveals a single-gap feature. The quantitative fitting of STS data results in Bardeen-Cooper-Schrieffer-like temperature dependence of the energy gap Δ(T), with 2Δ(0)/k_BT_c ∼ 4.3. The tunneling spectra of BaFe₂As₂ single crystals show no evidence for the opening of a gap below the magnetic/structural transition temperature T _MS ∼ 140K. This transition also had little impact on the transmission spectra in the wavelength range between 400 and 2400nm. But its effect on the magnetic properties is dramatic, as reflected in the unusual magnetic susceptibility over a wide temperature range.

Original language	English
Article number	054005
Journal	Superconductor Science and Technology
Volume	23
Issue number	5
DOIs	https://doi.org/10.1088/0953-2048/23/5/054005
State	Published - 2010

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Jin, R., Pan, M. H., He, X. B., Li, G., Li, D., Peng, R. W., Thompson, J. R., Sales, B. C., Sefat, A. S., McGuire, M. A., Mandrus, D., Wendelken, J. F., Keppens, V., & Plummer, E. W. (2010). Electronic, magnetic and optical properties of two Fe-based superconductors and related parent compounds. Superconductor Science and Technology, 23(5), Article 054005. https://doi.org/10.1088/0953-2048/23/5/054005

@article{af96231b76c84d34a982891d02ebe48a,

title = "Electronic, magnetic and optical properties of two Fe-based superconductors and related parent compounds",

abstract = "We have investigated the electronic, magnetic, and optical properties of two Fe-based superconductors and related parent compounds via three powerful techniques: scanning tunneling microscopy/spectroscopy (STM/S), high-temperature vibrating sample magnetometry, and optical transmission spectroscopy (OTS). Below the superconducting transition temperature Tc ∼ 48K, the STM/S of polycrystalline NdFeAsO0.86F0.14 reveals a single-gap feature. The quantitative fitting of STS data results in Bardeen-Cooper-Schrieffer-like temperature dependence of the energy gap Δ(T), with 2Δ(0)/kBTc ∼ 4.3. The tunneling spectra of BaFe2As2 single crystals show no evidence for the opening of a gap below the magnetic/structural transition temperature T MS ∼ 140K. This transition also had little impact on the transmission spectra in the wavelength range between 400 and 2400nm. But its effect on the magnetic properties is dramatic, as reflected in the unusual magnetic susceptibility over a wide temperature range.",

author = "R. Jin and Pan, {M. H.} and He, {X. B.} and Guorong Li and De Li and Peng, {Ru Wen} and Thompson, {J. R.} and Sales, {B. C.} and Sefat, {A. S.} and McGuire, {M. A.} and D. Mandrus and Wendelken, {J. F.} and V. Keppens and Plummer, {E. W.}",

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language = "English",

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journal = "Superconductor Science and Technology",

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Jin, R, Pan, MH, He, XB, Li, G, Li, D, Peng, RW, Thompson, JR, Sales, BC, Sefat, AS, McGuire, MA, Mandrus, D, Wendelken, JF, Keppens, V & Plummer, EW 2010, 'Electronic, magnetic and optical properties of two Fe-based superconductors and related parent compounds', Superconductor Science and Technology, vol. 23, no. 5, 054005. https://doi.org/10.1088/0953-2048/23/5/054005

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T1 - Electronic, magnetic and optical properties of two Fe-based superconductors and related parent compounds

AU - Jin, R.

AU - Pan, M. H.

AU - He, X. B.

AU - Li, Guorong

AU - Li, De

AU - Peng, Ru Wen

AU - Thompson, J. R.

AU - Sales, B. C.

AU - Sefat, A. S.

AU - McGuire, M. A.

AU - Mandrus, D.

AU - Wendelken, J. F.

AU - Keppens, V.

AU - Plummer, E. W.

PY - 2010

Y1 - 2010

N2 - We have investigated the electronic, magnetic, and optical properties of two Fe-based superconductors and related parent compounds via three powerful techniques: scanning tunneling microscopy/spectroscopy (STM/S), high-temperature vibrating sample magnetometry, and optical transmission spectroscopy (OTS). Below the superconducting transition temperature Tc ∼ 48K, the STM/S of polycrystalline NdFeAsO0.86F0.14 reveals a single-gap feature. The quantitative fitting of STS data results in Bardeen-Cooper-Schrieffer-like temperature dependence of the energy gap Δ(T), with 2Δ(0)/kBTc ∼ 4.3. The tunneling spectra of BaFe2As2 single crystals show no evidence for the opening of a gap below the magnetic/structural transition temperature T MS ∼ 140K. This transition also had little impact on the transmission spectra in the wavelength range between 400 and 2400nm. But its effect on the magnetic properties is dramatic, as reflected in the unusual magnetic susceptibility over a wide temperature range.

AB - We have investigated the electronic, magnetic, and optical properties of two Fe-based superconductors and related parent compounds via three powerful techniques: scanning tunneling microscopy/spectroscopy (STM/S), high-temperature vibrating sample magnetometry, and optical transmission spectroscopy (OTS). Below the superconducting transition temperature Tc ∼ 48K, the STM/S of polycrystalline NdFeAsO0.86F0.14 reveals a single-gap feature. The quantitative fitting of STS data results in Bardeen-Cooper-Schrieffer-like temperature dependence of the energy gap Δ(T), with 2Δ(0)/kBTc ∼ 4.3. The tunneling spectra of BaFe2As2 single crystals show no evidence for the opening of a gap below the magnetic/structural transition temperature T MS ∼ 140K. This transition also had little impact on the transmission spectra in the wavelength range between 400 and 2400nm. But its effect on the magnetic properties is dramatic, as reflected in the unusual magnetic susceptibility over a wide temperature range.

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VL - 23

JO - Superconductor Science and Technology

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Electronic, magnetic and optical properties of two Fe-based superconductors and related parent compounds

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