Back to Search
Start Over
Preparation and Electronic Properties of YBa2Cu3Ox Films with Controlled Oxygen Stoichiometries
- Source :
- Japanese Journal of Applied Physics. 37:4346
- Publication Year :
- 1998
- Publisher :
- IOP Publishing, 1998.
-
Abstract
- We describe a novel technique capable of controlling the oxygen content of YBa2Cu3O x (YBCO) films in a precise and reversible manner. The temperature dependence of resistivity and the distinct two-plateau behavior in critical temperature T co versus oxygen content plot of these films are consistent with those observed in the bulk and single crystals of YBCO. The O 1s and Cu 2p absorption spectra of these films were measured by polarization-dependent X-ray absorption spectroscopy (XAS). The intensity variations of the pre-edge peaks as a function of oxygen content are discussed. We also used these films to systematically study the electron-phonon coupling strength and the position of Fermi level by using a femtosecond pump-probe technique. A clear sign-reversal of the transient reflectivity, which was consistently explained by the thermomodulation model, was observed. Both of these optical measurements support the idea that the electronic structure of YBCO cuprates is based on the charge transfer model with hybridization between the Cu and O sites.
- Subjects :
- X-ray absorption spectroscopy
Materials science
Absorption spectroscopy
Fermi level
General Engineering
Analytical chemistry
General Physics and Astronomy
chemistry.chemical_element
Electronic structure
Oxygen
symbols.namesake
chemistry
Electrical resistivity and conductivity
Condensed Matter::Superconductivity
symbols
Cuprate
Stoichiometry
Subjects
Details
- ISSN :
- 13474065 and 00214922
- Volume :
- 37
- Database :
- OpenAIRE
- Journal :
- Japanese Journal of Applied Physics
- Accession number :
- edsair.doi...........b6a5e1a08e355ab81bb4a31e8450c9e5