Regensburg 2007 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 45: ZnO II
HL 45.5: Vortrag
Donnerstag, 29. März 2007, 15:00–15:15, H17
Electronic Structure of Europium Impiurities in ZnO — •Przemyslaw Imielski1, William Brewer1, Yuriy Manzhur2, Kay Potzger3, and Wolf Zeitz2 — 1Institut für Experimentalphysik, Freie Universität Berlin, D-14195 Berlin, Germany — 2Bereich Strukturforschung, Hahn-Meitner-Institut Berlin GmbH, D-14091 Berlin, Germany — 3Institute of Ion Beam Physics and Materials Research, Forschungszentrum Rossendorf, P.O. Box 510119, 01314 Dresden, Germany
Utilizing peturbed angular correlation spectroskopy (PAC), the behaviour of isolated europium impurities in ZnO has been investigated. The radioactive probe rare earth atoms 149Gd/149Eu were produced and recoil implanted by nuclear reactions. After annealing at 500 degree Celsius, the first spectrum of a 149Eu(11/2-) quadrupolar interaction has been measured. From spectra of the combined interaction, evidence for the realization of the Eu2+(7/2) ground state has been found.