Optical properties of Na0.68CoO2 thin film

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

Research output: Contribution to journalConference article

Abstract

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.

Original languageEnglish
Pages (from-to)4483-4486
Number of pages4
JournalPhysica Status Solidi (C) Current Topics in Solid State Physics
Volume4
Issue number12
DOIs
Publication statusPublished - 2007 Dec 1
EventInternational Symposium on Advanced Magnetic Materials and Appilications, (ISAMMA 2007) - Jeju, Korea, Republic of
Duration: 2007 May 282007 Jun 1

Fingerprint

optical properties
thin films
plasma frequencies
scattering
temperature
sapphire
reflectance
conductivity
temperature dependence
electrical resistivity

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Optical properties of Na0.68CoO2 thin film. / Hsu, M. H.; Liu, H. L.; Chang, W. J.; Lin, J. Y.

In: Physica Status Solidi (C) Current Topics in Solid State Physics, Vol. 4, No. 12, 01.12.2007, p. 4483-4486.

Research output: Contribution to journalConference article

Hsu, M. H. ; Liu, H. L. ; Chang, W. J. ; Lin, J. Y. / Optical properties of Na0.68CoO2 thin film. In: Physica Status Solidi (C) Current Topics in Solid State Physics. 2007 ; Vol. 4, No. 12. pp. 4483-4486.
@article{448e83d020fd43709ec61cab69719419,
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",
month = "12",
day = "1",
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",

}

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 - 2007/12/1

Y1 - 2007/12/1

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.

UR - http://www.scopus.com/inward/record.url?scp=38349163774&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=38349163774&partnerID=8YFLogxK

U2 - 10.1002/pssc.200777159

DO - 10.1002/pssc.200777159

M3 - Conference article

VL - 4

SP - 4483

EP - 4486

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

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

SN - 1862-6351

IS - 12

ER -