| Numéro |
J. Phys. IV France
Volume 05, Numéro C1, Janvier 1995
Europhysics Industrial Workshop EIW-12Industrial Applications of Positron Annihilation |
|
|---|---|---|
| Page(s) | C1-81 - C1-86 | |
| DOI | https://doi.org/10.1051/jp4:1995109 | |
Europhysics Industrial Workshop EIW-12
Industrial Applications of Positron Annihilation
J. Phys. IV France 05 (1995) C1-81-C1-86
DOI: 10.1051/jp4:1995109
1 Universität Bonn, Institut für Strahlen- und Kernphysik, Nussallee 14-16, 53115 Bonn, Germany
2 Max-Planck-Institut für Metallforschung, Institut für Physik, Heisenbergstrasse 1, 70569 Stuttgart, Germany
3 Universität Stuttgart, Institut für Theoretische und Angewandte Physik, Pfaffenwaldring 57, 70569 Stuttgart, Germany
© EDP Sciences 1995
Industrial Applications of Positron Annihilation
J. Phys. IV France 05 (1995) C1-81-C1-86
DOI: 10.1051/jp4:1995109
Polarized Positrons as Spin Detectors for Paramagnetic Centres in Solids
Ch. Deckers1, J. Ehmann2, H. Greif1, F. Keuser1, W. Knichel1, U. Lauff2, K. Maier1, A. Siegle3 and M. Tongbhoyai11 Universität Bonn, Institut für Strahlen- und Kernphysik, Nussallee 14-16, 53115 Bonn, Germany
2 Max-Planck-Institut für Metallforschung, Institut für Physik, Heisenbergstrasse 1, 70569 Stuttgart, Germany
3 Universität Stuttgart, Institut für Theoretische und Angewandte Physik, Pfaffenwaldring 57, 70569 Stuttgart, Germany
Abstract
A technique for studying paramagnetic defects in insulators or semiconductors acting as positron traps is presented. The spin polarization of the paramagnetic electrons of such centres can be determined by investigating the annihilation of spin-polarized positrons, e.g. by Doppler broadening (DB) or positron lifetime measurements. The viability of this technique is demonstrated by measuring the temperature dependence of the polarization of the paramagnetic electrons in F-centres in KCl in high magnetic fields (±4.5T).
© EDP Sciences 1995