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6 Acta Physica Polonica A

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Magnetic Properties of (Zn,Mn)Te Semimagnetic Alloy Co-Doped with Chromium

100%

Avdonin A. , Van Khoi L. , Knoff W. , Gałązka R.

Acta Physica Polonica A

2009

tom 116

nr 5

974-975

Results of simultaneous doping of ZnTe with manganese and chromium are presented. An increase of magnetization of ferromagnetic Cr-related clusters with manganese concentration is observed. Phosphorus doping prevents the formation of ferromagnetic clusters.

Magnetic Properties of ZMTO Alloys

100%

Avdonin A. , Knoff W. , Gałązka R.

Acta Physica Polonica A

2009

tom 116

nr 5

916-917

The results of the magnetization and photoluminescence measurements of the ZMTO are presented. Under field cooling conditions a phase transition is observed. The dependence of the temperature of transition on oxygen concentration is analyzed. A model is proposed.

Magnetoresistance and Electroluminescence near the Curie-Weiss Temperature in the Zn_{1-x}Mn_{x}Te Light Emitting Devices

88%

Van Khoi L. , Avdonin A. , Szymczak R. , Gałązka R. , Potemski M.

Acta Physica Polonica A

2009

tom 116

nr 5

941-943

The light emitting devices based on the p-Zn_{1-x}Mn_{x}Te bicrystals have been fabricated. The Zn_{1-x}Mn_{x}Te devices produce red and green emission originating from the internal d-shell transitions in the Mn^{2+} ions and the donor-acceptor pairs recombination, respectively. A critical behavior of the magnetic field dependence of the green emission intensity and a positive magnetoresistance near the Curie-Weiss temperature in the Zn_{1-x}Mn_{x}Te devices was observed.

Preparation and Optical Properties of Zn_{1-x}Mn_xTe_{1-y}O_y Highly Mismatched Alloy

88%

Avdonin A. , Van Khoi L. , Pacuski W. , Domukhovski V. , Gałązka R.

Acta Physica Polonica A

2007

tom 112

nr 2

407-414

The Zn_{1-x}Mn_xTe_{1-y}O_y alloy was prepared using a rapid crystallization technique. X-ray diffraction measurements were used to estimate the oxygen doping level. It is demonstrated that the oxygen solubility in Zn_{1-x} Mn_xTe_{1-y}O_y alloys greatly depends on the manganese concentration. No oxygen related effects were observed in the manganese free samples. The highest value of the oxygen molar fraction (y) achieved in the present study was 0.0023 in a sample having manganese fraction (x) of 0.056. The decrease in the alloy band gap was observed with increasing oxygen content. The oxygen-related trap level in Zn_{1-x}Mn_xTe_{1-y}O_y was found to be strongly shifted with respect to that in ZnTe_{1-y}O_y. The shift is assigned to a creation of complex (Mn_xO) traps.

Structural and Electrical Properties of SiC Grown by PVT Method in the Presence of the Cerium Vapor

75%

Avdonin A. , Racka K. , Tymicki E. , Grasza K. , Jakieła R. , Pisarek M. , Dobrowolski W.

Acta Physica Polonica A

2013

tom 124

nr 5

761-764

The results of investigation of structural and electrical properties of bulk SiC crystals, which were grown by physical vapor transport method with different Ce impurity content added to the SiC source material, are presented. The gradual dosage of cerium from the SiC source and continuous presence of the cerium vapor over the SiC crystallization fronts during the crystal growth processes are confirmed. The cerium influences the overall concentration of structural defects. The increase of the concentration of both, donors and acceptors, and appearance of new shallow donors (15-32 meV) in 4H-SiC crystals are observed.

Magnetic Order and Magnetic Inhomogeneities in SnCrTe-PbCrTe Solid Solutions

51%

Kilanski L. , Szymański M. , Brodowska B. , Górska M. , Szymczak R. , Podgórni A. , Avdonin A. , Reszka A. , Kowalski B. , Domukhovski V. , Arciszewska M. , Dobrowolski W. , Slynko V. , Slynko E.

Acta Physica Polonica A

2014

tom 126

nr 5

1203-1206

We present the studies of structural, electrical and magnetic properties of bulk Sn_{1-x-y}Pb_xCr_yTe mixed crystals with chemical composition 0.18 ≤ x ≤ 0.35 and 0.007 ≤ y ≤ 0.071. The magnetometric studies indicate that for the high Cr-content, y=0.071, the alloy shows ferromagnetic alignment with the Curie temperature, T_{C}, around 265 K. The Cr_5Te_8 clusters are responsible for the ferromagnetic order. At low Cr content, y ≈ 0.01, a peak in the ac magnetic susceptibility identified as the cluster-glass-like transition is observed at a temperature about 130 K. The cluster-glass-like transition is likely due to the presence of Cr_2Te_3 clusters in the samples with y ≈ 0.01. The transport characterization of the samples indicated strong metallic p-type conductivity with relatively high carrier concentration, n > 10^{20} cm^{-3}, and carrier mobility, μ > 150 cm^2/(V s).