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1

Analysis of 4f Level in Samarium-Rich MBE Grown CdSmTe Sample

100%

Szamota-Sadowska K., Gołacki Z., Orłowski B., Boyn R., Johnson R.

Acta Physica Polonica A

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1998

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vol. 94

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issue 3

560-564

EN

Electronic states of 4f samarium ions were investigated by photoemission spectroscopy in samarium-rich CdSmTe sample obtained by MBE. The photon energy of synchrotron radiation allowed to investigate Fano-type resonance and antiresonance. The energy distribution curve spectra were attributed to the Sm 4d-4f transition. The shape of the constant initial states spectra was compared with this one obtained for atomic samarium.

2

Cr 3d Surface and Bulk States in Sn_{1-x}Cr_{x}Te/Cr Crystals

86%

Guziewicz E., Szamota-Sadowska K., Kowalski B. J., Grodzicka E., Story T., Orłowski B. A., Johnson R. L.

Acta Physica Polonica A

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1997

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vol. 91

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issue 4

783-787

EN

We report a new approach to investigate metal-semiconductor interface formation. Photoemission spectroscopy was applied in order to investigate the clean surface of a Sn_{0.97}Cr_{0.03} Te crystal and to observe its changes under sequential deposition of small amounts of Cr atoms. In order to analyse the Cr 3d contribution to the valence band, the Fano-type resonance tuned to the Cr 3p-3d transition was used. The experiment was designed to follow the Sn_{0.97}Cr_{0.03} Te/Cr interface formation process. At the clean Sn_{0.97}Cr_{0.03}Te surface, the Cr 3d states contribution to the valence band was found to be positioned 0.8 eV below the Fermi level. After the Cr deposition processes the contribution shifted to a higher binding energy and another contribution 5.8 eV below the Fermi level was also observed.

3

MBE Growth and Properties of ZnYbTe Layers

86%

Sadowski J., Szamota-Sadowska K., Świątek K., Kowalczyk L., Abounadi A., Rajira A.

Acta Physica Polonica A

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1996

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vol. 90

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issue 5

1060-1064

EN

The MBE grown ZnYbTe layers were characterized by X-ray diffraction, photoluminescence and reflectivity measurements. The MBE growth conditions allowing to obtain monocrystalline ZnYbTe layers were found to be metal-rich (MBE growth with excess of Zn flux). In optical measurements (photoluminescence, reflectivity), both transitions connected with ternary ZnYbTe compound and with Yb^{3+} ions were detected. The quality of ZnYbTe layers with Yb content of 3% and 1% is inferior to the quality of pure ZnTe MBE layers, which is clearly seen in the results of photoluminescence and reflectivity measurements. In the ZnYbTe layers with 3% Yb, exhibiting monocrystalline character in reflection high-energy electron diffraction and X-ray diffraction measurements, optical transitions characteristic of pure YbTe were detected. In ZnYbTe layers with 1% Yb, no transitions connected with YbTe were observed.

4

Influence of Yb on Valence Band Density of States of CdYbTe and PbYbTe - a Resonant Photoemission Study

59%

Szamota-Sadowska K., Kowalski B., Guziewicz E., Orłowski B., Sadowski J., Gołacki Z., Ghijsen J., Johnson R., Belkhou R., Radosavkič D., Martinotti D., Barrett N., Guillot C.

Acta Physica Polonica A

|

1996

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vol. 90

|

issue 5

943-946

EN

Photoemission measurements using synchrotron radiation were performed on PbYbTe (bulk crystal) and CdYbTe (MBE thin film). The resonant enhancement of the photoemission was applied for investigation of the contribution of Yb 4f electrons to the valence band. The set of the energy distribution curves was collected for energies in the region close to the 4d-4f Fano transition. The Yb 4f^{14} were observed at the binding energies close to the edge of the valence band while the 4f^{13} states were revealed deep in the valence band.

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4 Acta Physica Polonica A

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4 Szamota-Sadowska K.

2 Gołacki Z.

2 Guziewicz E.

2 Johnson R.

2 Orłowski B.

2 Sadowski J.

1 Abounadi A.

1 Barrett N.

1 Belkhou R.

1 Boyn R.

1 Ghijsen J.

1 Grodzicka E.

1 Guillot C.

1 Johnson R. L.

1 Kowalczyk L.

1 Kowalski B.

1 Kowalski B. J.

1 Martinotti D.

1 Orłowski B. A.

1 Radosavkič D.

1 Rajira A.

1 Story T.

1 Świątek K.

Analysis of 4f Level in Samarium-Rich MBE Grown CdSmTe Sample

Cr 3d Surface and Bulk States in Sn_{1-x}Cr_{x}Te/Cr Crystals

MBE Growth and Properties of ZnYbTe Layers

Influence of Yb on Valence Band Density of States of CdYbTe and PbYbTe - a Resonant Photoemission Study