Positron 2D-ACAR experiments and electron-positron momentum density in YBa2Cu3O(7-x)
Abstract
We discuss positron annihilation (2D-ACAR) measurements in the C- projection on an untwinned metallic single crystal of YBa2Cu3(7-x) as a function of temperature, for five temperatures ranging from 30 to 300 K. The measured 2D-ACAR intensities are interpreted in terms of the electron-positron momentum density obtained within the KKR-band theory framework. The temperature dependence of the 2D-ACAR spectra is used to extract a 'background corrected' experimental spectrum which is in remarkable accord with the corresponding band theory predictions, and displays in particular clear signatures of the electron ridge Fermi surface.
- Publication:
-
Presented at the Annual Fall Meeting of the Materials Research Society
- Pub Date:
- December 1991
- Bibcode:
- 1991mrs..meetR...2S
- Keywords:
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- Atomic Structure;
- Copper Oxides;
- Fermi Surfaces;
- High Temperature Superconductors;
- Positron Annihilation;
- Barium Oxides;
- Crystals;
- Current Density;
- Momentum;
- Positrons;
- Temperature Dependence;
- Yttrium Oxides;
- Solid-State Physics