Optical properties of the iron-chalcogenide superconductor FeTe 0.55Se0.45

Christopher C. Homes; Ana Akrap; Jinsheng Wen; Zhijun Xu; Zhi Wei Lin; Qiang Li; Genda Gu

doi:10.1016/j.jpcs.2010.10.014

Optical properties of the iron-chalcogenide superconductor FeTe _0.55Se_0.45

Christopher C. Homes
, Ana Akrap
, Jinsheng Wen
, Zhijun Xu
, Zhi Wei Lin
, Qiang Li
, Genda Gu

Physics and Astronomy

Brookhaven National Laboratory Condensed Matter Physics and Materials Science Department

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

12 Scopus citations

Abstract

The complex optical properties of the iron-chalcogenide superconductor FeTe_0.55Se_0.45 with T_c=14 K have been examined over a wide frequency range for light polarized in the FeTe(Se) planes above and below T_c. At room temperature the optical response may be described by a weakly interacting Fermi liquid; however, just above T_c this picture breaks down and the scattering rate takes on a linear frequency dependence. Below T_c there is evidence for two gap features in the optical conductivity at Δ₁≃2.5meV and Δ ₂≃5.1meV. Less than 20% of the free carriers collapse into the condensate for T≫T_c, and this material is observed to fall on the universal scaling line for a BCS dirty-limit superconductor in the weak-coupling limit.

Original language	English
Pages (from-to)	505-510
Number of pages	6
Journal	Journal of Physics and Chemistry of Solids
Volume	72
Issue number	5
DOIs	https://doi.org/10.1016/j.jpcs.2010.10.014
State	Published - May 2011

Keywords

A. Chalcogenides
C. Infrared spectroscopy
D. Optical properties
D. Superconductivity

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10.1016/j.jpcs.2010.10.014

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title = "Optical properties of the iron-chalcogenide superconductor FeTe 0.55Se0.45",

abstract = "The complex optical properties of the iron-chalcogenide superconductor FeTe0.55Se0.45 with Tc=14 K have been examined over a wide frequency range for light polarized in the FeTe(Se) planes above and below Tc. At room temperature the optical response may be described by a weakly interacting Fermi liquid; however, just above Tc this picture breaks down and the scattering rate takes on a linear frequency dependence. Below Tc there is evidence for two gap features in the optical conductivity at Δ1≃2.5meV and Δ 2≃5.1meV. Less than 20\% of the free carriers collapse into the condensate for T≫Tc, and this material is observed to fall on the universal scaling line for a BCS dirty-limit superconductor in the weak-coupling limit.",

keywords = "A. Chalcogenides, C. Infrared spectroscopy, D. Optical properties, D. Superconductivity",

author = "Homes, \{Christopher C.\} and Ana Akrap and Jinsheng Wen and Zhijun Xu and \{Wei Lin\}, Zhi and Qiang Li and Genda Gu",

year = "2011",

month = may,

doi = "10.1016/j.jpcs.2010.10.014",

language = "English",

volume = "72",

pages = "505--510",

journal = "Journal of Physics and Chemistry of Solids",

issn = "0022-3697",

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TY - JOUR

T1 - Optical properties of the iron-chalcogenide superconductor FeTe 0.55Se0.45

AU - Homes, Christopher C.

AU - Akrap, Ana

AU - Wen, Jinsheng

AU - Xu, Zhijun

AU - Wei Lin, Zhi

AU - Li, Qiang

AU - Gu, Genda

PY - 2011/5

Y1 - 2011/5

N2 - The complex optical properties of the iron-chalcogenide superconductor FeTe0.55Se0.45 with Tc=14 K have been examined over a wide frequency range for light polarized in the FeTe(Se) planes above and below Tc. At room temperature the optical response may be described by a weakly interacting Fermi liquid; however, just above Tc this picture breaks down and the scattering rate takes on a linear frequency dependence. Below Tc there is evidence for two gap features in the optical conductivity at Δ1≃2.5meV and Δ 2≃5.1meV. Less than 20% of the free carriers collapse into the condensate for T≫Tc, and this material is observed to fall on the universal scaling line for a BCS dirty-limit superconductor in the weak-coupling limit.

AB - The complex optical properties of the iron-chalcogenide superconductor FeTe0.55Se0.45 with Tc=14 K have been examined over a wide frequency range for light polarized in the FeTe(Se) planes above and below Tc. At room temperature the optical response may be described by a weakly interacting Fermi liquid; however, just above Tc this picture breaks down and the scattering rate takes on a linear frequency dependence. Below Tc there is evidence for two gap features in the optical conductivity at Δ1≃2.5meV and Δ 2≃5.1meV. Less than 20% of the free carriers collapse into the condensate for T≫Tc, and this material is observed to fall on the universal scaling line for a BCS dirty-limit superconductor in the weak-coupling limit.

KW - A. Chalcogenides

KW - C. Infrared spectroscopy

KW - D. Optical properties

KW - D. Superconductivity

UR - https://www.scopus.com/pages/publications/79955749216

U2 - 10.1016/j.jpcs.2010.10.014

DO - 10.1016/j.jpcs.2010.10.014

M3 - Article

AN - SCOPUS:79955749216

SN - 0022-3697

VL - 72

SP - 505

EP - 510

JO - Journal of Physics and Chemistry of Solids

JF - Journal of Physics and Chemistry of Solids

IS - 5

ER -

Optical properties of the iron-chalcogenide superconductor FeTe _0.55Se_0.45

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Keywords

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