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Wyszukujesz frazę "Levchenko, K." wg kryterium: Autor

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    Wyświetlanie 1-8 z 8
    Tytuł:
    Magnetic and Magneto-Transport Characterization of (Ga,Mn)(Bi,As) Epitaxial Layers
    Autorzy:
    Levchenko, K.
    Andrearczyk, T.
    Domagala, J.
    Wosinski, T.
    Figielski, T.
    Sadowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1195381.pdf
    Data publikacji:
    2014-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    75.30.Gw
    73.50.Jt
    85.75.-d
    Opis:
    High-quality layers of the (Ga,Mn)(Bi,As) quaternary compound semiconductor have been grown by the low-temperature molecular-beam epitaxy technique. An effect of Bi incorporation into the (Ga,Mn)As ferromagnetic semiconductor and the post-growth annealing treatment of the layers have been investigated through examination of their magnetic and magneto-transport properties. Significant enhancement of the planar Hall effect magnitude upon addition of Bi into the layers is interpreted as a result of increased spin-orbit coupling in the (Ga,Mn)(Bi,As) layers.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 5; 1121-1124
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of misfit strain in (Ga,Mn)(Bi,As) epitaxial layers on their magnetic and magneto-transport properties
    Autorzy:
    Levchenko, K.
    Andrearczyk, T.
    Domagała, J.
    Sadowski, J.
    Kowalczyk, L.
    Szot, M.
    Figielski, T.
    Wosiński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1160667.pdf
    Data publikacji:
    2016-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    61.05.cp
    78.20.Ls
    73.50.Jt
    75.30.Gw
    Opis:
    Effect of misfit strain in the layers of (Ga,Mn)(Bi,As) quaternary diluted magnetic semiconductor, epitaxially grown on either GaAs substrate or (In,Ga)As buffer, on their magnetic and magneto-transport properties has been investigated. High-resolution X-ray diffraction, applied to characterize the structural quality and misfit strain in the layers, proved that the layers were fully strained to the GaAs substrate or (In,Ga)As buffer under compressive or tensile strain, respectively. Ferromagnetic Curie temperature and magneto-crystalline anisotropy of the layers have been examined by using magneto-optical Kerr effect magnetometry and low-temperature magneto-transport measurements. Post-growth annealing treatment of the layers has been shown to enhance the hole concentration and the Curie temperature in the layers.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 1a; A-90-A-93
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phonon Drag and Magnetic Anomalies of Thermopower in $RB_{12}$ (R = Ho, Er, Tm, Lu)
    Autorzy:
    Glushkov, V.
    Demishev, S.
    Ignatov, M.
    Khayrullin, E.
    Sluchanko, N.
    Shitsevalov, N.
    Levchenko, A.
    Filipov, V.
    Flachbart, K.
    Siemensmeyer, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813647.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.15.Jf
    75.50.Ee
    Opis:
    High precision measurements of the Seebeck coefficient S(T) were carried out on the single crystals of $RB_{12}$ (R = Ho, Er, Tm, Lu) at temperatures 2-300 K. It was shown that the effects of phonon drag result from vibrations of rare earth ions ($ħω_E$≈10-33 meV) in the rigid framework structure of the $B_{12}$ clusters and determine the main contribution to thermopower at intermediate temperatures (30-300 K). The correlated behavior of transport parameters favors the appreciable enhancement of spin fluctuations in the sequence of magnetic compounds $(HoB_{12}-TmB_{12})$ when approaching to the valence instability state in $YbB_{12}$. The giant increase in S(T) detected in the vicinity of the Néel temperature $T_N$ for $HoB_{12},$ $ErB_{12},$ and $TmB_{12}$ seems to result from the density of states renormalization caused by antiferromagnetic ordering.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 275-278
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bulk and Local Magnetic Susceptibility of $ErB_{12}$
    Autorzy:
    Bogach, A.
    Bogomolov, L.
    Glushkov, V.
    Demishev, S.
    Sluchanko, D.
    Sluchanko, N.
    Shitsevalova, N.
    Levchenko, A.
    Filipov, V.
    Flachbart, K.
    Siemensmeyer, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813645.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.15.Eb
    75.50.Ee
    Opis:
    High precision measurements of magnetoresistance Δρ/ρ = f(T,H) and magnetization M(T,H) were carried out on single crystals of rare-earth dodecaboride $ErB_{12}$ at temperatures in the interval 1.8-30 K in magnetic fields up to 70 kOe. The high accuracy of the experiments allowed us to perform numerical differentiation and analyze quantitatively the behavior of the derivative d(Δρ/ρ)/dH = f(T,H) and of the magnetic susceptibility χ(T,H) = dM/dH in paramagnetic and magnetically ordered (antiferromagnetic, $T_N$ ≈ 6.7 K and $T_M$ ≈ 5.85 K) phases of $ErB_{12}$. It was shown that negative magnetoresistance anomalies observed in present study in paramagnetic state of $ErB_{12}$ may be consistently interpreted in the framework of a simple relation between resistivity and magnetization -Δρ/ρ ~ $M^2$.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 271-274
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Anisotropy of Magnetoresistance in HoB₁₂
    Autorzy:
    Khoroshilov, A.
    Krasnorussky, V.
    Bogach, A.
    Glushkov, V.
    Demishev, S.
    Levchenko, A.
    Shitsevalova, N.
    Filipov, V.
    Gabáni, S.
    Flachbart, K.
    Anisimov, M.
    Siemensmeyer, K.
    Sluchanko, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032153.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.27.+a
    Opis:
    We present results of precision measurements of magnetoresistance of isotopically pure Ho¹¹B₁₂ at low temperatures 2÷10 K in magnetic field up to 80 kOe of different orientation to the crystal axes. The data obtained revealed strong anisotropy of magnetoresistance and allowed us to reconstruct magnetic H-T phase diagrams for main crystallographic directions H || [001], [110], and [111]. Analysis of magnetoresistance derivatives allowed to conclude in favor of two main magnetoresistance contributions. Among of them the negative quadratic component is attributed to charge carriers scattering on a magnetic clusters of Ho³⁺ ions (4f component) and positive linear one may be explained in terms of scattering on a spin density waves (5d component).
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 976-978
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Defect Mode in $LaB_{6}$
    Autorzy:
    Anisimov, M.
    Bogach, A.
    Glushkov, V.
    Demishev, S.
    Samarin, N.
    Gavrilkin, S.
    Mitsen, K.
    Shitsevalova, N.
    Levchenko, A.
    Filippov, V.
    Gabani, S.
    Flachbart, K.
    Sluchanko, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1371551.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    65.40.Ba
    Opis:
    The specific heat of high quality $La^{N}B_{6}$ (N=10, 11, natural) single crystals is investigated in a wide range of temperatures 2 - 300 K. The obtained data allow to estimate correctly (i) the electronic γ· T term of specific heat (γ ≈ 2.4 mJ/(mol·$K^{2}$)), (ii) the contribution from quasilocal vibrating mode of $La^{3+}$ ions ($Θ_{E}$ ≈ 150 - 152 K), (iii) the Debye-type term from rigid boron cages ($Θ_{D}$ ≈ 1160± 40 K). Our data also suggest an additional defect-mode component (iv) which may be attributed to a contribution of 1.5% boron vacancies in $LaB_{6}$. The obtained results may be interpreted in terms of formation of two level systems, which appear when $La^{3+}$ ions are displaced from their centrosymmetric positions in the cavities of rigid boron cages, apart from randomly distributed boron vacancies in the $LaB_{6}$ matrix.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 350-351
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hall Effect in $GdB_{6}$
    Autorzy:
    Anisimov, M.
    Bogach, A.
    Glushkov, V.
    Demishev, S.
    Samarin, N.
    Shitsevalova, N.
    Levchenko, A.
    Filippov, V.
    Kuznetsov, A.
    Flachbart, K.
    Sluchanko, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1371548.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.15.Gd
    Opis:
    The Hall effect of $GdB_{6}$ has been studied on high quality single crystals in the temperature range 2-150 K and in magnetic field of 1 T. The obtained data allow to detect anomalies in the antiferromagnetic (AF) phase including (i) a drastic enhancement of negative Hall coefficient below $T_{N1}$ ≈ 15.5 K and (ii) the appearance of an anomalous Hall effect at $T_{N2}$ ≈ 4.7 K. Possible scenarios of the AF ground state formation are discussed.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 348-349
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Anisotropy of the charge transport in GdB₆
    Autorzy:
    Anisimov, M.
    Glushkov, V.
    Bogach, A.
    Demishev, S.
    Samarin, N.
    Samarin, A.
    Shitsevalova, N.
    Levchenko, A.
    Filipov, V.
    Gábani, S.
    Flachbart, K.
    Sluchanko, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1052920.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.15.Gd
    Opis:
    The anisotropy of charge transport was investigated in the antiferromagnetic II state of GdB₆ from precise measurements of transverse magnetoresistance. Based on the data obtained we detected a complicated behavior of magnetoresistance curves which are characterized by the appearance of considerable hysteresis on the field and angular dependences below T_{N2}. Moreover it was shown that the system GdB₆ is sensitive to cooling-warming prehistory. The data analysis allowed to reconstruct magnetic H-T phase diagram of GdB₆ along main crystallographic directions (H||⟨001⟩,⟨110⟩,⟨111⟩) and to propose additional phase transition inside AF II phase at H₁ ≈ 0.5 T.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 973-975
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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