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3 Acta Physica Polonica A

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Magnetic Specific Heat Study of the Competition between Ferro- and Antiferromagnetic Spin-Spin exchange Interactions in PbSnMnTe

100%

Łazarczyk P. , Jędrzejczak A. , Story T. , Arciszewska M. , Gałązka R.

Acta Physica Polonica A

1996

tom 90

nr 5

891-894

Magnetic contribution to the specific heat, magnetic susceptibility and Hall effect are experimentally studied in Pb_{1-x-y}Sn_{y}Mn_{x}Te semimagnetic semiconductors with y=0.72 and x=0.08 and with different carrier concentrations 10^{20} ≤ p ≤ 10^{21} cm^{-3}. The ferromagnetism observed in crystals with p ≥ 3×10^{20} cm^{-3} breaks down with a decreasing concentration of carriers due to an increasing competition between Ruderman-Kittel-Kasuya-Yoshida and superexchange interactions.

Transport and Magnetic Properties of Pb_{1-x-y}Sn_{y}Mn_{x}Te (x ≤ 0.16)

86%

Łazarczyk P. , Grodzicka E. , Arciszewska M. , Witkowska B. , Dynowska E. , Miotkowska S. , Story T.

Acta Physica Polonica A

1995

tom 87

nr 2

469-472

Hall constant, conductivity and magnetic susceptibility of Pb_{1-x-y}Sn_{y}Mn_{x}Te semimagnetic semiconductor were investigated as a function of Mn content (x = 0.04, 0.09, 0.16, y = (0.7-0.8)) in the temperature range T = (4 - 300) K. A ferromagnetic phase transition takes place at T = 5 K for samples with x = 0.04, at T = 10 K for x = 0.09 and at T = 20 K for x = 0.16. For crystals with x ≥ 0.09 the strong temperature dependence of the Hall constant is observed for temperatures below 40 K. Magnetic field characteristics of the Hall effect is strongly non-linear at T = 4.2 K. No significant temperature or magnetic field dependence of conductivity is observed in the whole temperature range studied. The observed transport anomalies are due to the anomalous Hall effect.

Transport and Magnetic Study of Gd Ions in Pb_{1-y}Sn_{y}Te

72%

Story T. , Arciszewska M. , Łazarczyk P. , Łusakowski A. , Górska M. , Dobrowolski W. , Witkowska B. , Grodzicka E. , Gałązka R.

Acta Physica Polonica A

1997

tom 92

nr 5

997-1000

Electric conductivity, Hall effect and magnetic susceptibility of Pb_{1-x-y} Sn_{y}Gd_{x}Te mixed crystals with 0.13 ≤ y ≤ 0.93 and 0.001 ≤ x ≤ 0.04 were experimentally studied over the temperature range 4K ≤ T ≤ 300 K. The incorporation of Gd ions into the Pb_{1-y}Sn_{y}Te matrix results in semi-metallic n-type conductivity of the crystals with y < 0.6. For crystals with y > 0.6 one observes only semi-metallic p-type conductivity. We present a model explaining these results in terms of the Sn composition dependence of the location of Gd^{2+/3+} level with respect to the band edges of PbSnGdTe.