Autor: Aleshkevych, P. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Spin-Glass Transition in the $RCoGaO_{4}$ (R=Lu, Yb) Layered Cobaltites
Autorzy:: Radelytskyi, I.
Szymczak, R.
Dabkowska, H.
Noad, H.
Aleshkevych, P.
Szymczak, H.
Powiązania:: https://bibliotekanauki.pl/articles/1368512.pdf
Data publikacji:: 2014-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.30.Cr
75.30.Gw
75.30.Kz
75.40.-s
75.50.Lk
Opis:: The frequency, temperature, and the dc and ac dependences of the magnetic susceptibility of the $YbCoGaO_{4}$ and $LuCoGaO_{4}$ single crystals are investigated. The $YbCoGaO_{4}$ behaves like an Ising spin glass with a strong uniaxial anisotropy. In contrast $LuCoGaO_{4}$ is Heisenberg-like spin glass. Dynamical scaling reveals a three dimensional phase transition near Tg and yields critical exponent values between those of Heisenberg- and Ising-like systems.
Źródło:: Acta Physica Polonica A; 2014, 126, 1; 230-231
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Geometrically Frustrated Kagome Lattice with Chemical Disorder
Autorzy:: Szymczak, R.
Baran, M.
Fink-Finowicki, J.
Krzymanska, B.
Aleshkevych, P.
Szymczak, H.
Powiązania:: https://bibliotekanauki.pl/articles/1813765.pdf
Data publikacji:: 2008-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.30.Cr
75.20.-g
Opis:: The effect of nonmagnetic $Mg^{2+}$ and magnetic $Co^{2+}$ doping in Kagome compounds was investigated using DC magnetic susceptibility. The main effect of doping is to change the crystal field parameters. It was shown that $Co^{2+}$ doping increases considerably crystal field parameters in $Ni_3V_2O_8$ while doping with nonmagnetic $Mg^{2+}$ ions decreases considerably crystal field parameters in $Co_3V_2O_8$ crystals.
Źródło:: Acta Physica Polonica A; 2008, 113, 1; 413-416
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Effect of Chemical Disorder on Geometrically Frustrated Kagome Lattice
Autorzy:: Szymczak, H.
Szymczak, R.
Baran, M.
Fink-Finowicki, J.
Krzymanska, B.
Aleshkevych, P.
Jezierski, A.
Powiązania:: https://bibliotekanauki.pl/articles/1812268.pdf
Data publikacji:: 2008-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.25.+z
75.30.Gw
75.30.Kz
75.50.-
Opis:: This paper reviews recent progress in the studies of magnetic dilutions on magnetic properties of two frustrated systems: magnetoplumbite-like $SrGa_{12-x}Cr_xO_{19}$ and kagome staircase $Co_3V_2O_8$ doped with Mg ions. In the first group of compounds magnetic properties are determined by magnetic defects arising due to doping. In the case of kagome staircase compounds magnetic dilution suppresses effects of crystal field acting on magnetic ions. In particular, the dilution decreases magnetocrystalline anisotropy and anisotropy of magnetization.
Źródło:: Acta Physica Polonica A; 2008, 114, 1; 35-42
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Surface Magnetic Anisotropy of Epitaxial La$\text{}_{0.7}$Mn$\text{}_{1.3}$O$\text{}_{2.84}$ Thin Films
Autorzy:: Aleshkevych, P.
Baran, M.
Dyakonov, V.
Szymczak, R.
Szymczak, H.
Baberschke, K.
Lindner, J.
Lenz, K.
Powiązania:: https://bibliotekanauki.pl/articles/2046886.pdf
Data publikacji:: 2006-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 76.50.+g
75.70.-i
Opis:: A spin-wave resonance technique was used to collect information on elementary magnon excitations in high quality epitaxial La$\text{}_{0.7}$Mn$\text{}_{1.3}$O$\text{}_{2.84}$ films prepared by dc-magnetron sputtering. It was found that besides bulk spin-wave modes, the spin-wave resonance spectrum includes also the surface spin waves. The value of spin-wave stiffness constant D=156 meV·Å$\text{}^{2}$ was found. The values of the surface magnetic anisotropy on both surfaces and their angular dependence were determined. The experimentally found spin-wave resonance spectra were explained based on the surface-inhomogeneity model. The effect of surface anisotropy on the spin-wave excitation conditions in epitaxial La$\text{}_{0.7}$Mn$\text{}_{1.3}$O$\text{}_{2.84}$ films was investigated. Spin-wave resonance data give an indirect evidence of periodic charge-ordered stripes formation.
Źródło:: Acta Physica Polonica A; 2006, 110, 1; 57-70
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Formation of Iron-Containing Clusters in Silica of Predetermined Porosity
Autorzy:: Šimkiene, I.
Baran, M.
Babonas, G.-J.
Bendorius, R.-A.
Rėza, A.
Szymczak, R.
Aleshkevych, P.
Šustavičiūtė, R.
Tamaševičius, R.
Powiązania:: https://bibliotekanauki.pl/articles/2041804.pdf
Data publikacji:: 2005-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.46.+w
75.75.+a
78.66.-w
Opis:: Iron-containing nanoparticles and clusters were formed in silica with porosity, which was predetermined by different procedures of sol-gel technology and the chemical composition of precursors. Bulk and layer-type samples of different porosity were synthesized and investigated. The morphology, magnetic, and optical properties were studied to characterize the samples and to analyze the formation of Fe-oxides. Experimental results showed that both Fe$\text{}_{2}$O$\text{}_{3}$ and Fe$\text{}_{3}$O$\text{}_{4}$ were formed in the samples and that their relative amount was dependent on preparation technology.
Źródło:: Acta Physica Polonica A; 2005, 107, 2; 400-407
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

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

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