Mid-infrared reflectivity of single crystal Nd2-xCexCu4O4-y

Y. Watanabe; Z. Z. Wang; S. A. Lyon; N. P. Ong; D. C. Tsui; J. M. Tarascon; E. Wang

doi:10.1016/0038-1098(90)90930-A

Mid-infrared reflectivity of single crystal Nd_2-xCe_xCu₄O_4-y

Y. Watanabe, Z. Z. Wang, S. A. Lyon, N. P. Ong, D. C. Tsui, J. M. Tarascon, E. Wang

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Abstract

We have measured infrared reflectivity of single crystals of Nd_2-xCe_xCu₄O_4-y in the range between 0.05 eV and 1.5 eV. The superconducting or nearly superconducting crystals studied show a very high mid-IR reflectivity. Reflectivity of the samples is fitted much better with a Drude model, which yielded very similar fitting parameters (ω_p ∼ 2.5 eV) for all samples, than YBa₂Cu₃O₇ or Bi₂Sr₂CuO₆. However, a deviation from a Drude model was evident in the very low frequency and the fitting was considerably improved with a Drude-Lorentz model in both fittings of the reflectivity and the frequency dependent conductivity. Further, no temperature dependence of the reflectivity above 0.2 eV was observed between 25K and 200K. The present study suggests the inapplicability of the Drude model to this system and supports the existence of the mid-IR absorption.

Original language	English (US)
Pages (from-to)	757-761
Number of pages	5
Journal	Solid State Communications
Volume	74
Issue number	8
DOIs	https://doi.org/10.1016/0038-1098(90)90930-A
State	Published - May 1990

All Science Journal Classification (ASJC) codes

General Chemistry
Condensed Matter Physics
Materials Chemistry

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10.1016/0038-1098(90)90930-A

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@article{98f22bce76984f2d9d337b9de933ade2,

title = "Mid-infrared reflectivity of single crystal Nd2-xCexCu4O4-y",

abstract = "We have measured infrared reflectivity of single crystals of Nd2-xCexCu4O4-y in the range between 0.05 eV and 1.5 eV. The superconducting or nearly superconducting crystals studied show a very high mid-IR reflectivity. Reflectivity of the samples is fitted much better with a Drude model, which yielded very similar fitting parameters (ωp ∼ 2.5 eV) for all samples, than YBa2Cu3O7 or Bi2Sr2CuO6. However, a deviation from a Drude model was evident in the very low frequency and the fitting was considerably improved with a Drude-Lorentz model in both fittings of the reflectivity and the frequency dependent conductivity. Further, no temperature dependence of the reflectivity above 0.2 eV was observed between 25K and 200K. The present study suggests the inapplicability of the Drude model to this system and supports the existence of the mid-IR absorption.",

author = "Y. Watanabe and Wang, {Z. Z.} and Lyon, {S. A.} and Ong, {N. P.} and Tsui, {D. C.} and Tarascon, {J. M.} and E. Wang",

note = "Funding Information: Acknowledgements - We thank G~. Thomas for many useful discussions. Y.W. acknowledges sabbatical support from Mitsubishi Kasei (Japan). NPO is supported by the Office of Naval Research (Contract N00014-90-J-1013). SAL is supported by the National Science Foundation Presidential Young Investigator Program (Grant No. ECS8351620).",

year = "1990",

month = may,

doi = "10.1016/0038-1098(90)90930-A",

language = "English (US)",

volume = "74",

pages = "757--761",

journal = "Solid State Communications",

issn = "0038-1098",

publisher = "Elsevier Ltd",

number = "8",

}

TY - JOUR

T1 - Mid-infrared reflectivity of single crystal Nd2-xCexCu4O4-y

AU - Watanabe, Y.

AU - Wang, Z. Z.

AU - Lyon, S. A.

AU - Ong, N. P.

AU - Tsui, D. C.

AU - Tarascon, J. M.

AU - Wang, E.

N1 - Funding Information: Acknowledgements - We thank G~. Thomas for many useful discussions. Y.W. acknowledges sabbatical support from Mitsubishi Kasei (Japan). NPO is supported by the Office of Naval Research (Contract N00014-90-J-1013). SAL is supported by the National Science Foundation Presidential Young Investigator Program (Grant No. ECS8351620).

PY - 1990/5

Y1 - 1990/5

N2 - We have measured infrared reflectivity of single crystals of Nd2-xCexCu4O4-y in the range between 0.05 eV and 1.5 eV. The superconducting or nearly superconducting crystals studied show a very high mid-IR reflectivity. Reflectivity of the samples is fitted much better with a Drude model, which yielded very similar fitting parameters (ωp ∼ 2.5 eV) for all samples, than YBa2Cu3O7 or Bi2Sr2CuO6. However, a deviation from a Drude model was evident in the very low frequency and the fitting was considerably improved with a Drude-Lorentz model in both fittings of the reflectivity and the frequency dependent conductivity. Further, no temperature dependence of the reflectivity above 0.2 eV was observed between 25K and 200K. The present study suggests the inapplicability of the Drude model to this system and supports the existence of the mid-IR absorption.

AB - We have measured infrared reflectivity of single crystals of Nd2-xCexCu4O4-y in the range between 0.05 eV and 1.5 eV. The superconducting or nearly superconducting crystals studied show a very high mid-IR reflectivity. Reflectivity of the samples is fitted much better with a Drude model, which yielded very similar fitting parameters (ωp ∼ 2.5 eV) for all samples, than YBa2Cu3O7 or Bi2Sr2CuO6. However, a deviation from a Drude model was evident in the very low frequency and the fitting was considerably improved with a Drude-Lorentz model in both fittings of the reflectivity and the frequency dependent conductivity. Further, no temperature dependence of the reflectivity above 0.2 eV was observed between 25K and 200K. The present study suggests the inapplicability of the Drude model to this system and supports the existence of the mid-IR absorption.

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JO - Solid State Communications

JF - Solid State Communications

IS - 8

ER -

Mid-infrared reflectivity of single crystal Nd_2-xCe_xCu₄O_4-y

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