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    Wyświetlanie 1-7 z 7
    Tytuł:
    The Role of Frustration in Magnetism of Ge$\text{}_{1-x}$Cr$\text{}_{x}$Te Semimagnetic Semiconductor
    Autorzy:
    Kilanski, L.
    Górska, M.
    Dobrowolski, W.
    Arciszewska, M.
    Domukhovski, V.
    Anderson, J. R.
    Butch, N. P.
    Podgórni, A.
    Slynko, V. E.
    Slynko, E. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2048082.pdf
    Data publikacji:
    2011-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.40.Cx
    75.40.Gb
    75.50.Lk
    75.50.Pp
    Opis:
    We present preliminary studies of magnetic properties of Ge$\text{}_{1-x}$Cr$\text{}_{x}$Te semimagnetic semiconductors with low chromium content x < 0.026. The static and dynamic magnetometry techniques were employed for the current investigations. The obtained results showed large bifurcations between zero-field cooled and field cooled magnetization curves at temperatures lower than 50 K. The dynamic susceptibility measurements proved via frequency shifting of the peaks that the observed magnetic order at low temperatures was the spin-glass-like state caused by magnetic frustration of the system.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 5; 654-656
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of $Sn_{1-x}Cr_xTe$ Diluted Magnetic Semiconductors
    Autorzy:
    Kilanski, L.
    Podgórni, A.
    Górska, M.
    Dobrowolski, W.
    Slynko, V.
    Slynko, E.
    Reszka, A.
    Kowalski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399145.pdf
    Data publikacji:
    2013-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.80.Ga
    75.30.Hx
    75.30.Et
    75.50.Pp
    Opis:
    We present the studies of $Sn_{1-x}Cr_xTe$ semimagnetic semiconductors with chemical composition x ranging from 0.004 to 0.012. The structural characterization indicates that even at low average Cr-content x ≤q 0.012, the aggregation into micrometer size clusters appears in our samples. The magnetic properties are affected by the presence of clusters. In all our samples we observe the transition into the ordered state at temperatures between 130 and 140 K. The analysis of both static and dynamic magnetic susceptibility data indicates that the spin-glass-like state is observed in our samples. The addition of Cr to the alloy seems to shift the spin-glass-like transition from 130 K for x = 0.004 to 140 K for x = 0.012.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 5; 881-884
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Anomalous Hall Effect in $Ge_{1-x-y}Pb_{x}Mn_{y}Te$ Composite System
    Autorzy:
    Podgórni, A.
    Kilanski, L.
    Dobrowolski, W.
    Górska, M.
    Domukhovski, V.
    Brodowska, B.
    Reszka, A.
    Kowalski, B.
    Slynko, V.
    Slynko, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1376191.pdf
    Data publikacji:
    2014-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.J-
    72.80.Ga
    75.40.Mg
    75.50.Pp
    Opis:
    The purpose of this study was to investigate the magnetotransport properties of the $Ge_{0.743}Pb_{0.183}Mn_{0.074}Te$ mixed crystal. The results of magnetization measurements indicated that the compound is a spin-glass-like diluted magnetic semiconductor with critical temperature $T_{SG}$=97.5 K. Nanoclusters in the sample are observed. Both, matrix and clusters are magnetically active. Resistivity as a function of temperature has a minimum at 30 K. Below the minimum a variable-range hopping is observed, while above the minimum a metallic-like behavior occurs. The crystal has high hole concentration, p=6.6×$10^{20}$ $cm^{-3}$, temperature-independent. Magnetoresistance amplitude changes from -0.78 to 1.18% with increase of temperature. In the magnetotransport measurements we observed the anomalous Hall effect with hysteresis loops. Calculated anomalous Hall effect coefficient, $R_{S}$ = 2.0×$10^{6}$ $m^{3}$/C, is temperature independent. The analysis indicates the extrinsic skew scattering mechanism to be the main physical mechanism responsible for anomalous Hall effect in $Ge_{0.743}Pb_{0.183}Mn_{0.074}Te$ alloy.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 5; 1180-1183
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spinodal Decomposition of Magnetic Ions in Eu-Codoped $Ge_{1-x}Cr_{x}Te$
    Autorzy:
    Podgórni, A.
    Kilanski, L.
    Dobrowolski, W.
    Górska, M.
    Reszka, A.
    Domukhovski, V.
    Kowalski, B.
    Brodowska, B.
    Anderson, J.
    Butch, N.
    Slynko, V.
    Slynko, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1403631.pdf
    Data publikacji:
    2012-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.80.Ga
    75.40.Cx
    75.40.Mg
    75.50.Pp
    Opis:
    We present the experimental evidence for the presence of spinodal decomposition of the magnetic ions in the $Ge_{1-x-y}Cr_{x}Eu_{y}Te$ samples with chemical composition varying in the range of 0.015 ≤ x ≤ 0.057 and 0.003 ≤ y ≤ 0.042. The ferromagnetic transition at temperatures 50 ≤ T ≤ 57 K was observed, independent of the chemical composition. The long-range carrier mediated itinerant magnetic interactions seem to be responsible for the observed ferromagnetic order. The magnetic irreversibility with coercive field $H_C$ = 5 - 63 mT and the saturation magnetization $M_S$ ≈ 2 - 6 emu/g are found to strongly depend on the chemical composition of the alloy.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 6; 1012-1015
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Order and Magnetic Inhomogeneities in SnCrTe-PbCrTe Solid Solutions
    Autorzy:
    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.
    Powiązania:
    https://bibliotekanauki.pl/articles/1376790.pdf
    Data publikacji:
    2014-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.80.Ga
    75.30.Hx
    75.30.Et
    75.50.Pp
    Opis:
    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).
    Źródło:
    Acta Physica Polonica A; 2014, 126, 5; 1203-1206
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies of Diluted Magnetic Semiconductor $Sn_{1-x-y-z}Ge_{x}Mn_{y}Gd_{z}Te$
    Autorzy:
    Sichkovskyi, V.
    Radchenko, M.
    Lashkarev, G.
    Slyn'ko, V.
    Slyn'ko, E.
    Knoff, W.
    Domukhovski, V.
    Dziawa, P.
    Story, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791346.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.20.My
    75.50.Pp
    72.80.Ga
    Opis:
    Magnetization, anomalous Hall effect, thermoelectric power, magnetoresistance, and resistivity of $Sn_{1-x-y-z}Ge_{x}Mn_{y}Gd_{z}Te$ (x = 0.039÷0.597, y = 0.077÷0.125, z = 0.0014÷0.028) mixed crystals were studied over the temperature range 4.2-300 K. The ferromagnetic order with Curie temperature 18-24 K was revealed.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 911-912
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ferromagnetism of Narrow-Gap $Ge_{1-x-y}Sn_xMn_yTe$ and Layered $In_{1-x}Mn_xSe$ Semiconductors
    Autorzy:
    Lashkarev, G.
    Sichkovskyi, V.
    Radchenko, M.
    Dmitriev, A.
    Slyn'ko, V.
    Slyn'ko, E.
    Kovalyuk, Z.
    Butorin, P.
    Knoff, W.
    Story, T.
    Szymczak, R.
    Jakieła, R.
    Aleshkevych, P.
    Dobrowolski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811955.pdf
    Data publikacji:
    2008-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.20.My
    75.50.Pp
    75.30.Et
    77.80.Bh
    Opis:
    Magnetic susceptibility, Hall effect and resistivity of narrow-gap $Ge_{1-x-y}Sn_xMn_yTe$ single crystals (x = 0.083÷0.115; y = 0.025÷0.124) were investigated in the temperature range 4.2-300 K revealing a ferromagnetic ordering at $T_C$ ≈ 50 K. Temperature dependence of magnetization indicates a superparamagnetic phase with magnetic clusters arranging in a spin glass state below the freezing temperature $T_f$. Magnetic structure of InSe ⟨Mn⟩ 2D-ferromagnetic single crystals was studied by SQUID magnetometry, neutron diffraction, secondary ion mass spectroscopy, and wave dispersive spectra. Hysteresis loops of magnetization were observed at least up to 350 K. The cluster model of ferromagnetism is considered. The formation of self-assembled superlattice ferromagnetic InSe:Mn/antiferromagnetic MnSe during growth process and further annealing was established.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 5; 1219-1227
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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