Optical properties of Na0.68CoO2 thin film

M. H. Hsu; H. L. Liu; W. J. Chang; J. Y. Lin

doi:10.1002/pssc.200777159

Optical properties of Na_0.68CoO₂ thin film

M. H. Hsu^*, H. L. Liu, W. J. Chang, J. Y. Lin

^*Corresponding author for this work

Department of Physics

Research output: Contribution to journal › Conference article › peer-review

Abstract

The optical reflectance of single-crystalline Na_0.68CoO ₂ (thickness around 3000 Å) thin film has been measured over a wide frequency (40-55000 cm^-1) and at temperatures between 20 and 300 K. The roomtemperature optical conductivity spectrum displays a metallic character. In addition, one E_1u phonon mode at about 518 cm ^-1 is identified, while the other four phonon peaks are due to the sapphire substrate. As the temperature is lowered, the Drude plasma frequency exhibits little temperature dependence, whereas the scattering rate monotonically decreases with decreasing temperature. Notably, the Drude scattering rate at 20 K is found to approach zero, consistent with the small residual resistivity, indicating high quality of Na_0.68CoO ₂ thin film.

Original language	English
Pages (from-to)	4483-4486
Number of pages	4
Journal	Physica Status Solidi (C) Current Topics in Solid State Physics
Volume	4
Issue number	12
DOIs	https://doi.org/10.1002/pssc.200777159
Publication status	Published - 2007
Event	International Symposium on Advanced Magnetic Materials and Appilications, (ISAMMA 2007) - Jeju, Korea, Republic of Duration: 2007 May 28 → 2007 Jun 1

ASJC Scopus subject areas

Condensed Matter Physics

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10.1002/pssc.200777159

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title = "Optical properties of Na0.68CoO2 thin film",

abstract = "The optical reflectance of single-crystalline Na0.68CoO 2 (thickness around 3000 {\AA}) thin film has been measured over a wide frequency (40-55000 cm-1) and at temperatures between 20 and 300 K. The roomtemperature optical conductivity spectrum displays a metallic character. In addition, one E1u phonon mode at about 518 cm -1 is identified, while the other four phonon peaks are due to the sapphire substrate. As the temperature is lowered, the Drude plasma frequency exhibits little temperature dependence, whereas the scattering rate monotonically decreases with decreasing temperature. Notably, the Drude scattering rate at 20 K is found to approach zero, consistent with the small residual resistivity, indicating high quality of Na0.68CoO 2 thin film.",

author = "Hsu, {M. H.} and Liu, {H. L.} and Chang, {W. J.} and Lin, {J. Y.}",

year = "2007",

doi = "10.1002/pssc.200777159",

language = "English",

volume = "4",

pages = "4483--4486",

journal = "Physica Status Solidi (C) Current Topics in Solid State Physics",

issn = "1862-6351",

publisher = "Wiley-VCH Verlag",

number = "12",

note = "International Symposium on Advanced Magnetic Materials and Appilications, (ISAMMA 2007) ; Conference date: 28-05-2007 Through 01-06-2007",

}

TY - JOUR

T1 - Optical properties of Na0.68CoO2 thin film

AU - Hsu, M. H.

AU - Liu, H. L.

AU - Chang, W. J.

AU - Lin, J. Y.

PY - 2007

Y1 - 2007

N2 - The optical reflectance of single-crystalline Na0.68CoO 2 (thickness around 3000 Å) thin film has been measured over a wide frequency (40-55000 cm-1) and at temperatures between 20 and 300 K. The roomtemperature optical conductivity spectrum displays a metallic character. In addition, one E1u phonon mode at about 518 cm -1 is identified, while the other four phonon peaks are due to the sapphire substrate. As the temperature is lowered, the Drude plasma frequency exhibits little temperature dependence, whereas the scattering rate monotonically decreases with decreasing temperature. Notably, the Drude scattering rate at 20 K is found to approach zero, consistent with the small residual resistivity, indicating high quality of Na0.68CoO 2 thin film.

AB - The optical reflectance of single-crystalline Na0.68CoO 2 (thickness around 3000 Å) thin film has been measured over a wide frequency (40-55000 cm-1) and at temperatures between 20 and 300 K. The roomtemperature optical conductivity spectrum displays a metallic character. In addition, one E1u phonon mode at about 518 cm -1 is identified, while the other four phonon peaks are due to the sapphire substrate. As the temperature is lowered, the Drude plasma frequency exhibits little temperature dependence, whereas the scattering rate monotonically decreases with decreasing temperature. Notably, the Drude scattering rate at 20 K is found to approach zero, consistent with the small residual resistivity, indicating high quality of Na0.68CoO 2 thin film.

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U2 - 10.1002/pssc.200777159

DO - 10.1002/pssc.200777159

M3 - Conference article

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VL - 4

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EP - 4486

JO - Physica Status Solidi (C) Current Topics in Solid State Physics

JF - Physica Status Solidi (C) Current Topics in Solid State Physics

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T2 - International Symposium on Advanced Magnetic Materials and Appilications, (ISAMMA 2007)

Y2 - 28 May 2007 through 1 June 2007

ER -

Optical properties of Na_0.68CoO₂ thin film

Abstract

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