Optical study of RE 1 + x Ba 2 - x Cu 3 O 6 (RE = Nd, Sm) aaand YBa 2 Cu 3 O 6 in the mid infrared range
Abstract
Infrared reflectance, and transmission measurements as well as Raman scattering have been used to study the RE1+xBa2-xCu3O6 (RE = Nd, Sm) and YBa2Cu3O6 absorption bands in the 1100-1500 cm-1 infrared range as a function of temperature and beam polarization. In addition to two-phonon absorption between 1100 and 1170 cm-1, we observe excitations around 1400 cm-1, occurring in oxygen rich enclosures within the samples, and assign them to an excitation involving two-phonons plus the 270 cm-1 local mode related to Cu-O broken chains. Thus, the previously reported possible magnetic origin of the 1436 cm-1 sharp absorption band in YBa2Cu3O6 is contested.
- Publication:
-
European Physical Journal B
- Pub Date:
- August 2001
- DOI:
- 10.1007/PL00011148
- Bibcode:
- 2001EPJB...22..277B
- Keywords:
-
- PACS. 74.72.Jt Other cuprates – 74.25.Gz Optical properties – 74.25.Ha Magnetic properties – 71.55.Ht Other nonmetals;
- 74.72.Jt;
- 74.25.Gz;
- 74.25.Ha;
- 71.55.Ht;
- Other cuprates including Tl and Hg-based cuprates;
- Optical properties;
- Magnetic properties;
- Other nonmetals