Fano Resonance Investigation of PbTe Layers Containing Eu and Gd Ions

B.A. Orlowski a, V. Osinniy a, P. Dziawa a, M. Pietrzyk a, B.J. Kowalski a, B. Taliashvili a, T. Story a, R.L. Johnson b a Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland b Institut fűr Experimentalphysik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany

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Received: 24 09 2007;

The Fano resonance photoemission studies of Gd/(Pb, Gd)Te layers using synchrotron radiation were carried out and the electronic structure parameters like binding energies of Gd3+ 4f and 5p shells, resonance and antiresonance energies for Gd3+ were determined. The presence of Eu3+ ions was observed in the (Pb, Eu)Te and (Eu, Gd)Te layers grown by MBE technique. The comparison of data for (Pb, Gd)Te compound with corresponding data for (Eu, Gd)Te and (Pb, Eu)Te layers indicates that we are not able to distinct the Eu3+4f and Gd3+4f electrons contribution to the valence band photoemission spectra because of small content od Gd and similar binding energy values. The key parameters allowing to prove exactly the presence of either Eu3+ or Gd3+ are the resonance and antiresonance energies which are significantly different for these ions and equal to 143 eV/137 eV and 150 eV/142 eV, respectively.

DOI: 10.12693/APhysPolA.114.351 PACS numbers: 79.60.-i, 71.20.Mq