TITLE

Effects of disorder and scaling of optical conductivity in Nd0.5Ca0.5-xBaxMnO3 (x=0 and 0.02) thin films as observed by terahertz time-domain spectroscopy

AUTHOR(S)
Mavani, K. R.; Nagai, M.; Rana, D. S.; Yada, H.; Kawayama, I.; Tonouchi, M.; Tanaka, K.
PUB. DATE
December 2008
SOURCE
Applied Physics Letters;12/8/2008, Vol. 93 Issue 23, p231908
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We have explored the low energy charge dynamics of charge-ordered Nd0.5Ca0.5MnO3 and Ba-doped Nd0.5Ca0.48Ba0.02MnO3 manganite thin films by recording the complex optical spectra using terahertz time-domain spectroscopy. The extracted frequency- and temperature-dependent optical conductivity (σ) and dielectric constant ([variant_greek_epsilon]1) show distinct features at Néel’s ordering and the charge-ordering temperatures (TN and TCO). We found that the Ba-doping induced cation disorder effects on σ and [variant_greek_epsilon]1 are more pronounced above TCO, but these effects are subtle in a large temperature region below TCO. Both [variant_greek_epsilon]1 and σ increase as a function of temperature and form a scaling relationship [variant_greek_epsilon]1∝σ.
ACCESSION #
35886521

 

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