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Ferromagnetic Behavior of a Short Period Antiferromagnetic Superlattice

100%
Wilamowski Ż., Jantsch W., Faschinger W.
Acta Physica Polonica A
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1995
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vol. 87
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issue 1
185-188
EN
We present a study of short period MnTe/CdTe superlattices by mag­netic resonance. The usually antiferromagnetic structure exhibits critical line broadening above the Néel temperature typical of antiferromagnetic order­ing, but also some ferromagnetic properties at lower temperature. We suggest that the observed ferromagnetic-like moment originates from coupling of the moments of the recently proposed strong magnetic polarons.
2
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Mechanisms of Nonuniform Line Broadening

100%
Wilamowski Ż., Przybylińska H., Jantsch W.
Acta Physica Polonica A
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1995
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vol. 87
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issue 1
181-184
EN
When the spin relaxation time of paramagnetic impurities at different magnetic sites differs by orders of magnitude then instead of resonance line broadening, rather a decay of the line amplitude is expected. In particular, the sp-d coupling of magnetic impurities to shallow impurities leads to a nonuniform distribution of the longitudinal relaxation rates of local spins.
3
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PbSe:Cr - New Resonant Donor System

76%
Story T., Wilamowski Ż., Grodzicka E., Dobrowolski W., Witkowska B., Voiron J.
Acta Physica Polonica A
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1995
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vol. 87
|
issue 1
229-232
EN
Hall effect, conductivity, electron paramagnetic resonance and magneti­zation of Pb_{1-x}Cr_{x}Se (x ≤ 0.01) crystals were measured as a function of Cr content and electron concentration. The experimental results suggest that Cr in PbSe creates a resonant donor state with the energy of about 125 meV above the bottom of the conduction band.
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