Polarized reflectance spectra of a (001) surface of YBa2Cu3O7 before and after detwinning
| Autor: | Hans Peter Geserich, A. Zibold, M. Dürrler, A. Erb, German Müller-Vogt |
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| Rok vydání: | 1990 |
| Předmět: |
Materials science
business.industry Energy Engineering and Power Technology Condensed Matter Physics Polarization (waves) Reflectivity Molecular physics Spectral line Electronic Optical and Magnetic Materials Plasma edge Optics Condensed Matter::Superconductivity Dielectric function Electrical and Electronic Engineering Single domain Free carrier absorption business Single crystal |
| Zdroj: | Physica C: Superconductivity. 171:151-155 |
| ISSN: | 0921-4534 |
| DOI: | 10.1016/0921-4534(90)90468-t |
| Popis: | We have performed reflection measurements on a (001) surface of a YBa 2 Cu 3 O 7 single crystal, using polarized light in the energy range between 50 meV and 6 eV. The crystal was grown with the typical twinned structure of this compound, showing a reflectance spectrum which was independent of the direction of polarization. The spectrum was characterized by free carrier absorption with a plasma edge near 1 eV. By applying uniaxial stress at 450°C the twinned structure was removed. The crystal surface was transformed into a single untwinned domain, resulting in a strong splitting of the plasma edge with respect to the direction of polarization. By fitting a Lorentz-Drude model to the polarized reflectance spectra of the single domain crystal, R ∥ a and R ∥ b , the tensor components of the dielectric function could be determined whereas the reflectance spectrum of the twinned surface represents an average of the components of both crystallographic directions. |
| Databáze: | OpenAIRE |
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