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5 Acta Physica Polonica A

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Magnetic Anisotropy of V^{++} in CdS

100%

Herbich M. , Mac W. , Twardowski A. , Demianiuk M.

Acta Physica Polonica A

1996

tom 90

nr 4

809-812

The magnetization measurements at magnetic field up to 6 T obtained from newly grown hexagonal Cd_{1-x}V_{x}S (x ≈ 0.0004) are presented. The strong anisotropy of magnetization is observed at low temperatures (1.6 < T < 20 K). The data are well described by the crystal field model calculations taking into account static trigonal Jahn-Teller distortion and spin-orbit coupling.

Exchange Parameters of CdCrS Semimagnetic Semiconductor

88%

Herbich M. , Mac W. , Twardowski A. , Ando K. , Demianiuk M.

Acta Physica Polonica A

1997

tom 92

nr 4

774-776

Free exciton magnetoreflectance and magnetization of Cd_{1-x}Cr_{x}S (0.0024 < x < 0.0031) were measured at T = 2.0 K and magnetic field up to 5 T. Combining the heavy hole exciton splitting with the magnetization data the exchange integral N_{0}β = +0.46±0.04 eV was evaluated within the framework of mean field approximation.

Influence of Local Potential on Exciton Splitting in Highly Diluted Cd_{1-x}Mn_{x}Te

88%

Kłopotowski L. , Herbich M. , Mac W. , Stachow-Wójcik A. , Twardowski A.

Acta Physica Polonica A

1997

tom 92

nr 4

837-840

We investigated magnetoreflectance and magnetization of highly diluted bulk Cd_{1-x}Mn_{x}Te crystals 0.2% ≤ x ≤ 10%. The exchange constant in terms of mean field approximation and virtual crystal approximation (the ratio of the heavy hole exciton splitting to mean spin per unit cell) was evaluated and found x-dependent. This deviation from the mean field approximation and virtual crystal approximation prediction is caused by the local potential introduced by Mn ions. We discuss the problem within a Wigner-Seitz approach and within a model of magnetic and chemical disorder based on the alloy theory.

s,p-d Exchange Constants of ZnFeTe Diluted Magnetic Semiconductor

75%

Mac W. , Herbich M. , Khoi N. T. , Twardowski A. , Shapira Y. , Demianiuk M.

Acta Physica Polonica A

1995

tom 88

nr 5

845-848

Reflectance and degree of polarization of reflectance of the free exciton in Zn_{1-x}Fe_{x}Te (x ≈ 0.002) was measured at T = 1.9 K and magnetic field up to 5 T. Combining the exciton splitting with the magnetization data we estimated the exchange constant N_{0}(α-β) = 2.1 eV.

Effects of the Spin-Dependent Potential fluctuations on Free Exciton Zeeman Splitting of Zn_{1-x}Mn_{x}Se

75%

Herbich M. , Mac W. , Stachow A. , Twardowski A. , Tworzydło J. , Demianiuk M.

Acta Physica Polonica A

1996

tom 90

nr 4

813-816

Magnetoreflectance of free exciton and magnetization in Zn_{1-x}Mn_{x}Se (0.0007 < x < 0.12) were measured. The evaluated proportionality factor between the exciton splitting and the magnetization showed a strong concentration dependence. This effect cannot be explained within the mean field approximation and the virtual crystal approximation and it was described within the model including chemical and magnetic disorder.