1. Effect of Mn substitution by Ga on the optical properties of a metallic manganite
- Author
-
Nucara, A., Maselli, P., Del Bufalo, M., Guidi, M. Cestelli, Garcia, J., Orgiani, P., Maritato, L., and Calvani, P.
- Subjects
Condensed Matter - Strongly Correlated Electrons - Abstract
In a metallic manganite like La(2/3)Sr(1/3)MnO(3), the substitution of Mn(+3) by Ga(+3) dilutes the ferromagnetic order and locally cancels the Jahn-Teller distortion, without heavily affecting the crystal structure. One can thus follow the changes in the charge dynamics induced by Ga, until the ferro-metallic manganite is turned into an insulator. Here this phenomenon is studied in detail through the infrared reflectivity of five samples of La(2/3)Sr(1/3)Mn(1-x)Ga(x)O(3), with x increasing from 0 to 0.30 and for 50 < T < 320 K. A simple model which links the measured optical parameters to the magnetization M(x, T) well describes the behavior of the plasma frequency, the scattering rate, and the mid-infrared absorption along the metal-to-insulator transition., Comment: 8 pages including 7 figures
- Published
- 2007
- Full Text
- View/download PDF