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    Wyświetlanie 1-14 z 14
    Tytuł:
    Elastic Constants of β-HgS
    Autorzy:
    Prieur, J. Y.
    Joffrin, J.
    Szuszkiewicz, W.
    Dynowska, E.
    Górecka, J.
    Witkowska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1992069.pdf
    Data publikacji:
    1998-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.20.Dc
    64.60.My
    Opis:
    The elastic constants of single crystals of β-HgS highly doped with iron were directly determined at room temperature from the measurements of ultrasonic wave velocities by the pulse-echo technique. The values of c$\text{}_{11}$=6.750, c$\text{}_{12}$=5.186, and c$\text{}_{44}$=2.42 (given at 10$\text{}^{10}$ N m$\text{}^{-2}$ units) were obtained and compared with the experimental data taken for other mercury chalcogenides. The elastic characteristics of this group of materials is quite similar to those of Cd and Zn chalcogenides.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 3; 487-491
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lattice Dynamics of Cubic Mercury Sulphide
    Autorzy:
    Szuszkiewicz, W.
    Dybko, K.
    Dynowska, E.
    Górecka, J.
    Witkowska, B.
    Hennion, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1952186.pdf
    Data publikacji:
    1996-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.20.Dc
    63.20.-e
    Opis:
    The acoustic phonon dispersion of mercury sulphide of zinc-blende structure (β-HgS) was studied by inelastic neutron scattering. The measurements were carried out at 19 K and 295 K on HgS crystals doped with Fe. A slight decrease in phonon frequencies with increasing temperature was found, the temperature dependence being the strongest for LA phonons with [ξ,ξ,0] propagation. From acoustic phonon dispersion the values of selected elastic constants were determined for β-HgS.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 5; 947-950
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization and Selected Physical Properties of CdTe/MnTe Short Period Strained Superlattices
    Autorzy:
    Szuszkiewicz, W.
    Dynowska, E.
    Bąk-Misiuk, J.
    Karczewski, G.
    Wojtowicz, T.
    Kossut, J.
    Jouanne, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1952708.pdf
    Data publikacji:
    1996-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.20.-e
    78.30.Fs
    Opis:
    Phonon excitations in (CdTe)$\text{}_{12}$/(MnTe)$\text{}_{n}$ (100) superlattices (n=2, 4, 8) were investigated at 295 K and 25 K with the use of Raman scattering. From the "folded" phonon frequencies the elastic constant c$\text{}_{11}$ value for MnTe was estimated. The strain arising from lattice mismatch (determined by X-ray diffraction) results in shifts of MnTe and CdTe "confined" LO phonon frequencies. For the precise determination of LO phonon dispersions an additional shift due to Mn diffusion at the CdTe/MnTe interface should be taken into account.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 5; 1090-1094
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interlayer Exchange Coupling in Short Period GaMnAs/GaAs Superlattices
    Autorzy:
    Szuszkiewicz, W.
    Dynowska, E.
    Hennion, B.
    Ott, F.
    Jouanne, M.
    Morhange, J. F.
    Karlsteen, M.
    Sadowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2027487.pdf
    Data publikacji:
    2001-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.12.-q
    75.25.+z
    78.30.Fs
    Opis:
    The low dimensional structures containing III-V ferromagnetic semiconductors were intensively investigated in the last few years because of the variety of their potential applications. The aim of the present work was to study the interlayer exchange coupling in the short period GaMnAs/GaAs superlattices containing 16 or 8 GaMnAs monolayers. Samples with the magnetic layers corresponding to the mixed crystal composition with 5% or 6% of Mn were grown by MBE technique and characterized by both high-resolution X-ray diffraction and Raman scattering methods. Folded acoustic phonons were observed for the first time for this particular quantum system in the Raman scattering spectra. The interlayer exchange coupling in selected superlattices was investigated by both elastic neutron scattering (diffraction) and polarized neutron reflectivity measurements. Presence of the smooth interfaces and the stability of the superlattice period were confirmed by neutron reflectometry data. Ferromagnetic correlation of the magnetization vector in subsequent GaMnAs magnetic layers was demonstrated by both experimental methods.
    Źródło:
    Acta Physica Polonica A; 2001, 100, 3; 335-341
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Characterization of MBE-Grown Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te Layers by Raman Spectroscopy
    Autorzy:
    Szuszkiewicz, W.
    Dynowska, E.
    Janik, E.
    Karczewski, G.
    Wojtowicz, T.
    Kossut, J.
    Jouanne, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945228.pdf
    Data publikacji:
    1996-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.20.-e
    75.50.Pp
    78.30.-j
    Opis:
    In this paper we discuss a possibility of an optical characterization of thin semiconductor epilayers by Raman scattering measurements. As an example zinc blende Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te epilayers (0.66 ≤ x ≤ 1.0) have been grown by molecular beam epitaxy method and investigated by Raman scattering and X-ray diffraction. Information resulting from both methods is compared and discussed.
    Źródło:
    Acta Physica Polonica A; 1996, 89, 3; 335-340
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Raman Scattering by Phonons and Magnons in MBE-Grown Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te Layers
    Autorzy:
    Szuszkiewicz, W.
    Jouanne, M.
    Dynowska, E.
    Janik, E.
    Karczewskl, G.
    Wojtowicz, T.
    Kossut, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1934042.pdf
    Data publikacji:
    1995-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Ds
    63.20.-e
    78.30.Fs
    Opis:
    Collective excitations have been analyzed for Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te epilayers (0.66 ≤ x ≤ 1) by the Raman scattering studies performed at temperatures from 7 K to 295 K. Apart from the lattice optical modes magnetic excitations (magnons) were observed at sufficiently low temperatures.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 5; 941-944
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Raman Characterization of MBE-Grown Layered MnTe/CdTe Structures
    Autorzy:
    Szuszkiewicz, W.
    Jouanne, M.
    Morhange, J.
    Kanehisa, M. A.
    Mariette, H.
    Hartmann, J. M.
    Dynowska, E.
    Karczewski, G.
    Wojtowicz, T.
    Kossut, J.
    Barnaś, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968435.pdf
    Data publikacji:
    1997-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Ds
    78.30.-j
    75.70.Ak
    Opis:
    Raman scattering measurements on (MnTe)$\text{}_{8}$/(Cd$\text{}_{0.64}$Zn$\text{}_{0.36}$Te)$\text{}_{8}$ multilayer grown by MBE method and on various (MnTe)$\text{}_{n}$/(CdTe)$\text{}_{12}$ multilayers (where n=8,12,16,24) were performed at low temperatures. In the z̅(x,x)z polarization, structures corresponding to folded acoustic phonons were found. In z̅(x,y)z polarization new complex structures were observed in the low-frequency part of Raman scattering spectra. A possible magnetic origin of these structures is discussed.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 5; 1021-1024
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selected Properties of Lattice Dynamics of HgSe and β-HgS
    Autorzy:
    Szuszkiewicz, W.
    Dybko, K.
    Dynowska, E.
    Górecka, J.
    Witkowska, B.
    Hennion, B.
    Jouanne, M.
    Julien, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968437.pdf
    Data publikacji:
    1997-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.30.-j
    63.20.-e
    61.12.-q
    Opis:
    Optical phonon dispersion for β-HgS was measured by the neutron scattering for the first time. The results confirmed theoretically predicted anomalous behavior of phonon modes in this material, resulting probably from high ionicity of mercury sulphide and large difference of Hg and S atomic mass. Influence of the isotopic effects on the TO-phonon mode for HgSe and HgS is analyzed. The possible observation of such effects in IR reflectivity spectra taken for HgSe at low temperature is discussed.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 5; 1029-1032
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties of Fe Doped β-HgS under Hydrostatic Pressure
    Autorzy:
    Szuszkiewicz, W.
    Skierbiszewski, C.
    Paszkowicz, W.
    Dybko, K.
    Domagała, J.
    Dynowska, E.
    Witkowska, B.
    Zinn, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1992279.pdf
    Data publikacji:
    1998-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.10.Gs
    64.60.My
    71.55.Gs
    Opis:
    High pressure- high temperature studies of the structural (zinc blende- cinnabar) phase transitions were performed in Hg$\text{}_{1-x}$Fe$\text{}_{x}$ S mixed crystals (x<0.1) using synchrotron radiation and multianvil X-ray diffraction press. Pressure investigations of the Hall effect and conductivity of crystals containing up to a few percent of Fe were also performed at 295 K and 77 K. It was demonstrated that Fe in β-HgS creates deep, localized donor state resonant with the conduction band.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 3; 570-574
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnons in Cubic MBE-Grown A$\text{}_{1-x}$Mn$\text{}_{x}$Te Layers (A = Cd, Zn, Mg)
    Autorzy:
    Szuszkiewicz, W.
    Hennion, B.
    Jouanne, M.
    Morhange, J. F.
    Dynowska, E.
    Janik, E.
    Wojtowicz, T.
    Zieliński, M.
    Furdyna, J. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1992341.pdf
    Data publikacji:
    1998-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.12.-q
    75.50.Pp
    78.30.-j
    Opis:
    One-magnon excitations in MBE-grown A$\text{}_{1-x}$Mn$\text{}_{x}$Te layers (where A = Cd, Zn, Mg and x>0.7) were investigated by means of the Raman scattering measurements at low temperatures (≈20 K). The composition dependence of the anisotropy energy - as extracted from these measurements - is discussed. Further, the elastic neutron scattering measurements were performed in layers of cubic MnTe, which constitute the end point material of the ternary alloys series. Abundance of variously oriented antiferromagnetic domains in MnTe layers as a function of temperature was studied. We confirm occurrence of a pronounced magnetostriction effect.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 3; 583-587
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Temperature Dependence of Raman Scattering by Magnons in Bulk-Like MBE-Gwn MnTe Films
    Autorzy:
    Szuszkiewicz, W.
    Mohrange, J. F.
    Jouanne, M.
    Kanehisa, M. A.
    Świrkowicz, R.
    Dynowska, E.
    Janik, E.
    Wojtowicz, T.
    Kossut, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968436.pdf
    Data publikacji:
    1997-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Ds
    75.50.Pp
    78.30.-j
    Opis:
    Temperature dependence of the magnon frequency was studied for cubic MnTe epilayers by the Raman scattering measurements. Experimental data are compared to the results of theoretical calculations performed within the framework of the Heisenberg model using Green's function formalism.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 5; 1025-1028
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elastic Properties of Zinc Blende MnTe
    Autorzy:
    Djemia, P.
    Roussigné, Y.
    Stashkevich, A.
    Szuszkiewicz, W.
    Gonzalez Szwacki, N.
    Dynowska, E.
    Janik, E.
    Kowalski, B. J.
    Karczewski, G.
    Bogusławski, P.
    Jouanne, M.
    Morhange, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038250.pdf
    Data publikacji:
    2004-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.20.Dc
    75.50.Pp
    78.35.+c
    Opis:
    The Brillouin light scattering was used to investigate elastic properties of the zinc blende, MBE-grown MnTe layer that was deposited on a (001) GaAs substrate covered by CdTe buffer layer. The three elastic constants of the zinc blende MnTe, namely c$\text{}_{11}$, c$\text{}_{12}$, and c$\text{}_{44}$, were directly determined for the first time from the frequency of the Rayleigh mode, of the pseudo-surface mode, and of the shear horizontal bulk mode traveling parallel to the layer surface. The value of c$\text{}_{11}$ was checked using the frequency of longitudinal bulk waves propagating at different angles from the normal of the layer plane. This value was also independently determined by results of the folding of acoustic phonons, observed for MnTe/CdTe superlattices by the Raman scattering. Finally, the bulk modulus given by the formula B=(c$\text{}_{11}$+2c$\text{}_{12}$)/3 was determined for zinc blende MnTe by ab initio calculations making use of the density functional theory and atomic pseudopotentials; spin polarization of MnTe was taken into account. A satisfactory agreement between theoretical and experimental values was obtained.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 2; 239-247
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Morphology and Selected Properties of Core/Shell ZnTe-Based Nanowire Structures Containing ZnO
    Autorzy:
    Gas, K.
    Janik, E.
    Zaleszczyk, W.
    Pasternak, I.
    Dynowska, E.
    Fronc, K.
    Kolkovsky, V.
    Kret, S.
    Morhange, J. F.
    Reszka, A.
    Wiater, M.
    Caliebe, W.
    Karczewski, G.
    Kowalski, B. J.
    Szuszkiewicz, W.
    Wojtowicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047950.pdf
    Data publikacji:
    2011-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.37.Hk
    68.37.Lp
    68.65.La
    81.07.Vb
    Opis:
    We report on an approach to fabricate ZnTe-based core/shell radial heterostructures containing ZnO, as well as on some of their physical properties. The molecular beam epitaxy grown ZnTe nanowires constituted the core of the investigated structures and the ZnO shells were obtained by thermal oxidation of ZnTe NWs. The influence of the parameters characterizing the oxidation process on selected properties of core/shell NWs were examined. Scanning electron microscopy revealed changes of the NWs morphology for various conditions of the oxidation process. X-ray diffraction, high resolution transmission electron microscopy, and Raman scattering measurements were applied to reveal the presence of ZnTe single crystal core and polycrystalline ZnO-shell of investigated structure.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 5; 612-614
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Growth and Properties of ZnMnTe Nanowires
    Autorzy:
    Zaleszczyk, W.
    Janik, E.
    Presz, A.
    Szuszkiewicz, W.
    Morhange, J. F.
    Dłużewski, P.
    Kret, S.
    Kirmse, H.
    Neumann, W.
    Dynowska, E.
    Domagała, J. Z.
    Caliebe, W.
    Aleszkiewicz, M.
    Pacuski, W.
    Golnik, A.
    Kossacki, P.
    Baczewski, L. T.
    Petroutchik, A.
    Karczewski, G.
    Wojtowicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047697.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.46.Df
    68.65.La
    78.55.Et
    78.67.Bf
    81.15.Hi
    Opis:
    Catalytically enhanced growth of ZnMnTe diluted magnetic semiconductor nanowires by molecular beam epitaxy is reported. The growth is based on the vapor-liquid-solid mechanism and was performed on (001) and (011)-oriented GaAs substrates from elemental sources. X-ray diffractometry, scanning and transmission electron microscopy, atomic force microscopy, photoluminescence spectroscopy, and Raman scattering were performed to determine the structure of nanowires, their chemical composition, and morphology. These studies revealed that the obtained ZnMnTe nanowires possess zinc-blende structure, have an average diameter of about 30 nm, typical length between 1 and 2μm and that Mn$\text{}^{2+}$ ions were incorporated into substitutional sites of the ZnTe crystal lattice.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 351-356
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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