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1
Content available remote Solubility Limit of Ni in Cd_{1-x}Ni_{x}Te Crystals
100%
Miotkowska S. , Miotkowski I. , Dynowska E.
Acta Physica Polonica A
|
1994
|
tom 86
|
nr 5
737-739
EN
The Cd_{1-x}Ni_{x}Te crystals were grown by the Bridgman method. The investigated samples were cut from five different ingots with nominal contents of nickel varied from 0.005 to 0.05. The investigations were performed using X-ray powder diffraction method and energy dispersive and wavelength dispersive electron microprobe analysis. The samples were ałso examined in a scanning electron microscope. Examinations of wavelength dispersive electron microprobe analysis show that the actual contents of nickel differ from the nominal values. The solubility limit of nickel was determined to be x = 0.005. The precipitates of NiTe were found in samples of a greater content of nickel. Their dimensions were between 5 to 90 micrometers. X-ray powder diffraction measurements did not reveal any significant change of the lattice constant of investigated crystals in comparison with pure CdTe.
2
Content available remote Application of Photomemory Effect in Cd_{1-x}Mn_{x}Te_{1-y}Se_{y}:In for Direct Measurements of Magnetization of Bound Magnetic Polarons
100%
Wojtowicz T. , Koleśnik S. , Miotkowski I. , Furdyna J.
Acta Physica Polonica A
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1992
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tom 82
|
nr 4
637-640
EN
The first direct measurement of the magnetization of donor bound magnetic polarons in diluted magnetic semiconductors is reported. The experiment has been performed taking advantage of photomemory effect found in n-type Cd_{1-x}Mn_{x}Te_{1-y}Se_{y} crystals doped with In. Good agreement between experimental results and theory of bound magnetic polarons is observed.
3
Content available remote Structural Properties of Cd_{1-x}Mg_{x}Te and Cd_{1-x-y}Mg_{x}Mn_{y}Te Crystals
100%
Miotkowska S. , Dynowska E. , Miotkowski I.
Acta Physica Polonica A
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1994
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tom 86
|
nr 4
605-611
EN
Electron probe microanalysis and X-ray diffraction studies have been performed on samples of ternary Cd_{1-x}Mg_{x}Te (0.05 ≤ x ≤ 0.09) and quaternary Cd_{1-x-y}Mg_{x}Mn_{y}Te (0.025 ≤ x ≤ 0.4; 0.025 ≤ y ≤ 0.7) alloys. The investigated samples were cut from 24 different ingots grown by Bridgman method. Microprobe examinations have revealed significant differences between actual and nominal content of Mg along the longitudinal direction for both ternary and quaternary ingots. In contrast to Mg, for most Cd_{1-x-y}Mg_{x}Mn_{y}Te samples the actual Mn content was within ±5% of nominal content. The lattice constants have been determined by X-ray powder diffraction method. Whereas Cd_{1-x-y}Mg_{x}Mn_{y}Te samples exhibit only zinc blende crystal structure for the entire region of x and y investigated, the Cd_{1-x}Mg_{x}Te alloy has two different structures depending on Mg content; a zinc blende structure below x = 0.5 and a wurtzite structure above it. In both alloys the lattice constant decreases with increasing Mg content.
4
Content available remote Light-Controlled Transport in Doped Diluted Magnetic Semiconductors near Localization Boundary
88%
Głód P. , Dietl T. , Wojtowicz T. , Sawicki M. , Miotkowski I.
Acta Physica Polonica A
|
1993
|
tom 84
|
nr 4
657-660
EN
We report milikelvin studies of light induced metastable changes of the conductivity of the In doped Cd_{0.95}Mn_{0.05}Te_{0.97}Se_{0.03} crystals in the vicinity of the metal-insulator transition.
5
Content available remote Persistent Spin Resonance of Donor Electrons and Hopping Magnetoconductivity in Cd_{1-x}Mn_{x}Te_{1-y}Se_{y}
75%
Wojtowicz T. , Semaltianos N. , Kłosowski P. , Dobrowolska M. , Furdyna J. , Miotkowski I.
Acta Physica Polonica A
|
1991
|
tom 80
|
nr 2
287-290
EN
The first observation of electric dipole spin resonance of donor electrons in Cd_{1-x}Mn_{x}Te_{1-y}Se_{y} in far-infrared magnetotransmission is reported. Modification of the donor wave function due to non-diagonal exchange interaction with localized magnetic moments and to magnetic fluctuations are believed to allow this resonance. Hopping magnetoconductivity studied in the same crystals shows a behavior typical for wide gap diluted magnetic semiconductors.
6
Content available remote Precipitates in Cd_{1-x}Ni_{x}Se Crystals Grown by the Bridgman Method
75%
Kachniarz J. , Dynowska E. , Miotkowska S. , Paszkowicz W. , Miotkowski I. , Ramdas A.
Acta Physica Polonica A
|
1992
|
tom 82
|
nr 5
725-728
EN
Single crystals of Cd_{1-x}Ni_{x}Se alloys (x ranging from 0 to 0.075) were investigated using electron microprobe and X-ray diffraction. The analysis shows the presence of Ni-Se precipitates. The solubility limit of Ni is estimated to be 0.008.
7
Content available remote Light-Induced Gratings in CdMnTeSe:In Crystals
75%
Koziarska-Glinka B. , Ponder M. , Wojtowicz T. , Miotkowski I. , Langer J. M. , Suchocki A.
Acta Physica Polonica A
|
1997
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tom 92
|
nr 5
883-886
EN
We show that DX-like centers in Cd_{1-x}Mn_{x}Te_{1-y}Se_{x}:In crystal can be used in writing volume holographic gratings. The scattering efficiency is higher than 10% which proves the dispersive character of the light-induced gratings. Two different metastable centers with different lattice relaxation were found in the crystal. Measurements of the power dependence of the degenerate four-wave mixing scattering efficiency testify that both of these centers have negative U properties.
8
Content available Solubility and Segregation of Co in CdTe-Based Ternary and Quaternary Alloys
75%
Miotkowska S. , Dynowska E. , Miotkowski I. , Alawadhi H. , Lewicki A. , Metcalf P. , Ramdas A.
Acta Physica Polonica A
|
2002
|
tom 101
|
nr 5
735-742
EN
Single crystals of Cd_{1-x}Co_xTe and Cd_{1-x-y}Co_xMn_yTe are characterized with X-ray powder diffraction and electron microprobe to establish compositional dependence of the lattice parameters and deduce Co solubility limit. The experimental compositional profiles are examined on specimens taken from various locations of ingots along their longitudinal axes and compared with normal freezing distributions. The values of Co segregation coefficient are analyzed for both ternary and quaternary alloys in terms of normal freezing mode.
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