TY - JOUR
T1 - Optical properties of Na0.68CoO2 thin film
AU - Hsu, M. H.
AU - Liu, H. L.
AU - Chang, W. J.
AU - Lin, Jiunn-Yuan
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.
UR - http://www.scopus.com/inward/record.url?scp=38349163774&partnerID=8YFLogxK
U2 - 10.1002/pssc.200777159
DO - 10.1002/pssc.200777159
M3 - Conference article
AN - SCOPUS:38349163774
SN - 1862-6351
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
IS - 12
T2 - International Symposium on Advanced Magnetic Materials and Appilications, (ISAMMA 2007)
Y2 - 28 May 2007 through 1 June 2007
ER -