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1
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Temperature Dependence of the Energy Gap in Cd_{1-x}Fe_{x}Se

100%
Gaj J., Nguyen K., Arciszewska M., Lebecki K.
Acta Physica Polonica A
|
1991
|
vol. 80
|
issue 3
405-407
EN
The energy gap and magnetic susceptibility of Cd_{0.85}Fe_{0.15}Se were measured in function of temperature. Experiments showed that the magnetic contribution to the variation of the energy gap in Cd_{1-x}Fe_{x}Se is not proportional to the product of magnetic susceptibility and temperature as it has been observed in Mn^{++}-containing semiconductors.
2
Content available remote

Scattering Dynamics of Excitons in ZnSe Based Semimagnetic Semiconductors

100%
Nguyen K., Mac W., Gaj J.
Acta Physica Polonica A
|
1992
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vol. 82
|
issue 4
634-636
EN
Resonant Raman scattering was measured for (Zn,Fe)Se and (Zn,Cr)Se with the magnetic ion mole fraction below 0.02. LO phonons and intra-Fe^{++} transitions were observed. Polarization measurements versus magnetic field allowed to obtain polarization lifetimes (polariton flight times) in the sub-picosecond range.
3
Content available remote

Scattering Dynamics of Free Excitons on Fe^{++} Ions in Cd_{1-x}Fe_{x}Se

88%
Gaj J., Nguyen K., Nawrocki M., Golnik A., Lebecki K.
Acta Physica Polonica A
|
1991
|
vol. 80
|
issue 3
409-412
EN
Inelastic scattering of excitons on Fe^{++} ions in Cd_{1-x}Fe_{x}Se was studied by resonant Raman scattering. Polarization measurements were done using a modulation technique, allowing for the first time to determine the full polarization state of the detected light. The obtained results were compared to a simple calculation in an incoherent model of scattering on Fe^{++} ions.
4
Content available remote

Exchange Interaction in ZnCrSe Semimagnetic Semiconductor

88%
Mac W., Nguyen K., Twardowski A., Gaj J., Demianiuk M.
Acta Physica Polonica A
|
1992
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vol. 82
|
issue 5
902-904
EN
Magnetoreflectance and magnetization of ZnCrSe were measured for B ≤ 5 T and T = 2 K. A linear dependence between exciton splitting and magnetization was found. The s, p-d exchange parameter was estimated: N_{0}α-N_{0}β=0.67eV.
5
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Magnetooptical Analysis of Interface Mixing in Pulsed Laser Evaporation and Epitaxy Grown CdTe/Cd_{0.9}Mn_{0.1}Te Multiple Quantum Well and Superlattice

88%
Lewalski A., Nguyen K., Kossacki P., Gaj J., Dubowski J.
Acta Physica Polonica A
|
1993
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vol. 84
|
issue 3
571-574
EN
A recently proposed magnetooptical method of determination of interface mixing was applied to CdTe/CdMnTe superstructures grown by pulsed laser evaporation and epitaxy. Diffusion length were found ≈ 5 Å for a multiple quantum well and > 15 Å for a superlattice. Ranges of Mn mole fractions and well width values enabling efficient application of the method were determined.
6
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Preparation and Luminescent Properties of ZnTe-Cd_{1-x}Mn_{x}Te_{1-y}Se_{y} Heterojunction

76%
Le K., Dobrowolski W., Witkowska B., Mycielski A., Galązka R., Nguyen K.
Acta Physica Polonica A
|
1995
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vol. 87
|
issue 2
325-328
EN
ZnTe-Cd_{1-x}Mn_{x}Te_{1-y}Se_{y} heterojunctions were prepared by vapor-transport epitaxy of ZnTe on In-doped Cd_{1-x}Mn_{x}Te_{1-y}Se_{y} (x = 0.05, y = 0.03) single crystalline substrate in vacuum. At temperatures lower than 120 K the infrared and red electroluminescence were observed from the ZnTe-Cd_{1-x}Mn_{x}Te_{1-y}Se_{y} diode with forward current density in the range 0.003-4.0 A/cm^{2}.
7
Content available remote

Faraday Rotation and Photoionization of ZnCrSe Semimagnetic Semiconductor

76%
Mac W., Nguyen K., Gaj J., Twardowski A., Demianiuk M., Stachow-Uciakowska A.
Acta Physica Polonica A
|
1993
|
vol. 84
|
issue 3
567-570
EN
The magnetoabsorption and the Faraday rotation of ZnCrSe were measured for B ≤ 5 T and T = 2 K in the region of photon energies lower than the fundamental absorption edge. The circular dichroism of the photoionization absorption bane was observed and analyzed. The Faraday rotation was interpreted as due to the sum of contributions from interband and photoionization optical transitions.
8
Content available remote

Mechanism of Optical Detection of Magnetic Resonance in Cd_{1-x}Mn_{x}Te

76%
Godlewski M., Surma M., Gałązka R., Nguyen K., Gisbergen S., Gregorkiewicz T., Ammerlaan C.
Acta Physica Polonica A
|
1992
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vol. 82
|
issue 4
717-719
EN
The photoluminescence and optically detected magnetic resonance studies of Cd_{1-x}Mn_{x}Te (x = 0.095) are presented. The Mn^{2+} magnetic resonance is detected optically via the changes of "edge" emission induced by the decrease of the Mn spin system magnetization.
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