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Synchrotron Radiation Photoemission Studies of Mn 3d States in Zn_{1-x}Mn_{x}Se

100%
Zema N., Lama F., Piacentini M., Felici A., Dębowska D., Kisiel A., Olson C.
Acta Physica Polonica A
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1995
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vol. 87
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issue 2
495-499
EN
The angle integrated resonant photoemission measurements of Zn_{0.9}Mn_{0.1}Se have been performed in the photon energy range between 30 eV and 70 eV using synchrotron radiation. The ternary compound va­lence band photoemission spectra show, in comparison to the ZnSe results, additional structures, whose intensity depends on Mn content. These new features have been assigned to transitions from the Mn 3d states of e sym­metry with spin up. The hybridization of the t_{2} component of the 3d electrons of Mn in the valence band is discussed.
2
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Vacuum Ultraviolet Reflectivity of Cd_{1-x}Fe_{x}Te

100%
Dębowska D., Zimnal-Starnawska M., Kisiel A., Piacentini M., Zema N., Giriat W.
Acta Physica Polonica A
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1992
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vol. 82
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issue 2
341-347
EN
Reflectivity spectra for mixed crystals Cd_{1-x}Fe_{x}Te with 0.00 ≤ x ≤0.05 were investigated. The measurements were carried out in the energy range 6.0-30.0 eV at 300 K. The influence of Fe^{2+}(3d^{6}) states on the changes in the energy positions of the reflectivity maxima E'_{1} , E'_{1} + ∆, c, d, e, f, h and i is analysed. The obtained results confirm the band structure diagrams published previously.
3
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Room and Liquid Nitrogen Temperature Reflectivity Spectra of Co,Se Mixed Crystals

100%
Dębowska D., Zimnal-Starnawska M., Kisiel A., Piacentini M., Zema N., Lama F., Giriat W.
Acta Physica Polonica A
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1995
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vol. 87
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issue 1
275-278
EN
The optical properties of the semiconducting compounds Zn_{1-x}Co_{x}Se crystallizing in the zinc-blende structure have been investigated. The reflectivity spectra of these materials for different concentration of Co ions, have been taken out in a wide energy range between 4 and 25 eV at room (RT) and liquid nitrogen temperature (LNT) using synchrotron radiation from ADONE Storage Ring in Frascati. The comparisons between the reflectivity spectra of ternary systems and host crystal ZnSe are made. On the basis of the experimental and theoretical results, the changes of the structures of the reflectivity spectra of host crystal ZnSe caused by the influence of transition metal ions are discussed.
4
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Liquid Nitrogen Temperature Reflectivity Spectra of Zn_{1-x}Mn_{x}Se and Zn_{1-y}Fe_{y}Se Mixed Crystals

100%
Zimnal-Starnawska M., Dębowska D., Kisiel A., Piacentini M., Lama F., Zema N., Giriat W.
Acta Physica Polonica A
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1994
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vol. 86
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issue 5
869-874
EN
The liquid nitrogen temperature reflectivity spectra of the tetrahedral diluted magnetic semiconductors (DMS's) Zn_{1-y}Fe_{y}Se and Zn_{1-x}Mn_{x}Se crystallizing in the zinc-blende structure were investigated. The reflectivity measurements for different concentration of Fe (y = 0.01, 0.05, and 0.10) and Mn (x = 0.10 and 0.30) ions were taken out in a wide energy range between 4 and 30 eV using synchrotron radiation from ADONE storage ring in Frascati. The average resolution ΔE/E used for these measurements was better than 1 × 10^{-3} over the entire spectral range. The single crystals were cleaved, before being mounted inside the reflectometer, from the samples grown by the Bridgman method. The comparison between the reflectivity spectra of ternary systems and host crystal ZnSe is made. The changes of the structures of reflectivity spectra of host crystal ZnSe caused by the influence of Fe and Mn ions are discussed.
5
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Electronic Structure of Zinc-Blende Zn_{0.5}V_{0.5}Se: Theoretical Study

84%
Markowski R., Hołda A., Dębowska D., Kisiel A., Zimnal-Starnawska M., Piacentini M., Zema N., Lama F.
Acta Physica Polonica A
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1995
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vol. 88
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issue 5
1023-1027
EN
In this paper we present a comprehensive study of electronic structure of Zn_{0.5}V_{0.5}Se from the theoretical point of view. Partial and total density of states for spin-polarized antiferromagnetic phase of Zn_{0.5}V_{0.5}Se as well as schematic layouts of the bands have been obtained using the ab initio self-consistent semirelativistic linear muffin-tin orbital method.
6
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Electronic Structure of Zinc-Blende Zn_{0.5}Co_{0.5}Se: Theoretical Study

84%
Hołda A., Markowski R., Dębowska D., Kisiel A., Zimnal-Starnawska M., Piacentini M., Zema N., Lama F.
Acta Physica Polonica A
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1996
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vol. 90
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issue 4
817-820
EN
In this paper we present partial densities of states for spin-polarized antiferromagnetic phase of Zn_{0.5}Co_{0.5}Se as well as schematic layouts of the bands, obtained using the ab initio self-consistent semi-relativistic linear muffin tin orbital method. We also present, from theoretical point of view, the analysis of influence of the transition metal cobalt on the electronic structure of a pure ZnSe.
7
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Synchrotron Radiation Photoemission Studies of Fe 3d States in Cd_{1-x}Fe_{x}Se

84%
Zema N., Lama F., Piacentini M., Felici A. C., Dębowska D., Kisiel A., Mycielski A., Olson C. G.
|
EN
The angle integrated resonant photoemission measurements of Cd_{1-x}Fe_{x}Se were performed for different Fe concentrations (x = 0.00, 0.07, 0.14) in the photon energy range between 30 eV and 70 eV using synchrotron radiation. The ternary compound valence band photoemission spectra show, in comparison to the CdSe results, two additional structures, whose intensity depends on Fe content, which were assigned to Fe 3d states of e symmetry with spin up and down, respectively. The hybridization of the t_{2} component of the 3d electrons of Fe in the valence band is discussed.
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