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    Wyświetlanie 1-15 z 15
    Tytuł:
    Infrared Optical and X-Ray Determination of Parameters for MOVPE Grown InAs$\text{}_{1-x}$Sb$\text{}_{x}$ Epilayers
    Autorzy:
    Marszałek, B.
    Zielińska-Rohozińska, E.
    Bożek, R.
    Stępniewski, R.
    Witowski, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968371.pdf
    Data publikacji:
    1997-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    78.20.-e
    78.30.-j
    Opis:
    The experimental room-temperature transmission of metalorganic vapour phase epitaxy grown InAsSb epilayers is compared with calculations based on a Kane model of the band structure. The band structure parameters are found. The composition of the samples was determined by X-ray diffraction.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 5; 919-922
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Temperature Dependence of the First-Order Raman Phonon Lines in GaS$\text{}_{0.25}$Se$\text{}_{0.75}$ Layered Crystals
    Autorzy:
    Gasanly, N. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035649.pdf
    Data publikacji:
    2002-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.-e
    78.30.-j
    78.30.Hv
    Opis:
    Systematic measurements by Raman scattering of the frequency and line width of the zone-center optical modes in GaS$\text{}_{0.25}$Se$\text{}_{0.75}$ layered crystal over the temperature range of 10-300 K are carried out. The analysis of temperature dependence of intralayer modes shows that frequency shift and line broadening are successfully modeled by including the contributions from thermal expansion and lattice anharmonicity. The purely anharmonic contribution (phonon-phonon coupling) is found to be due to three-phonon processes.
    Źródło:
    Acta Physica Polonica A; 2002, 102, 6; 801-810
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Low-Temperature Raman Scattering in TlGa$\text{}_{x}$In$\text{}_{1-x}$S$\text{}_{2}$ Layered Mixed Crystals: Compositional Dependence of the Mode Frequencies and Line Shapes
    Autorzy:
    Gasanly, N. M.
    Yuksek, N. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044573.pdf
    Data publikacji:
    2005-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.-e
    78.30.Hv
    78.30.-j
    Opis:
    The Raman spectra of TlGa$\text{}_{x}$In$\text{}_{1-x}$S$\text{}_{2}$ layered mixed crystals were studied for a wide range of composition (0≤x≤1) at T=50 K. The effect of crystal disorder on the line width broadening of the Raman-active modes are discussed. The asymmetry in the Raman line shape is analyzed for two interlayer and intralayer modes exhibiting one-mode behavior.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 6; 997-1003
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Compositional Dependence of Optical Modes Frequencies in $TlGa_xIn_{1-x}S_2$ Layered Mixed Crystals (0 ≤ x ≤1)
    Autorzy:
    Isik, M.
    Gasanly, N.
    Korkmaz, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1204878.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.82.Fk
    77.84.Bw
    78.20.-e
    78.30.-j
    Opis:
    The infrared transmittance and Raman scattering spectra in $TlGa_xIn_{1-x}S_2$ (0 ≤ x ≤1) layered mixed crystals grown by the Bridgman method were studied in the frequency ranges of 400-2000 and 250-$400 cm^{-1}$, respectively. The bands observed at room temperature in IR transmittance spectra of $TlGa_xIn_{1-x}S_2$ were interpreted in terms of multiphonon absorption processes. The dependences of the frequencies of IR- and Raman-active modes on the composition of $TlGa_xIn_{1-x}S_2$ mixed crystals were also established. The structural characterization of the mixed crystals was investigated by means of X-ray diffraction measurements and compositional dependence of lattice parameters was revealed.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 3; 747-750
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Substrate on Vibrational Properties of Single-Layer MoS₂
    Autorzy:
    Gołasa, K.
    Molas, M.
    Nogajewski, K.
    Grzeszczyk, M.
    Zinkiewicz, M.
    Potemski, M.
    Babiński, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398570.pdf
    Data publikacji:
    2016-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.22.-m
    71.35.-y
    78.20.-e
    78.30.-j
    Opis:
    We report on the Raman scattering from single-layer molybdenum disulfide (MoS₂) deposited on various substrates: Si/SiO₂, hexagonal boron nitride (h-BN), sapphire, as well as suspended. Room temperature Raman scattering spectra are investigated under both resonant (632.8 nm) and non-resonant (514.5 nm) excitations. A rather weak influence of the substrate on the Raman scattering signal is observed. The most pronounced, although still small, is the effect of h-BN, which manifests itself in the change of energy positions of the E' and A'₁ Raman modes of single-layer MoS₂. We interpret this modification as originating from van der Waals interaction between the MoS₂ and h-BN layers.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 5; 1172-1175
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Properties of Molybdenum Disulfide $(MoS_2)$
    Autorzy:
    Gołasa, K.
    Grzeszczyk, M.
    Korona, K.
    Bożek, R.
    Binder, J.
    Szczytko, J.
    Wysmołek, A.
    Babiński, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399110.pdf
    Data publikacji:
    2013-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.22.-m
    71.35.-y
    78.20.-e
    78.30.-j
    Opis:
    Research of a monolayer and a bulk $MoS_2$ is reported. The room temperature Raman spectra of the natural $MoS_2$ crystals for the both resonant (632.8 nm) and the non-resonant (532 nm) excitation are presented. The apparent differences observed in the spectra from the bulk and the one monolayer $MoS_2$ are discussed. In particular, the feature due to a first order scattering involving the LA(M) phonon in the resonance Raman spectrum of the one monolayer $MoS_2$ was observed and explained in terms of the disorder in the natural crystal. The disorder is also documented by the line-shape of the room-temperature photoluminescence spectra observed from both the bulk and the one monolayer $MoS_2$.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 5; 849-851
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical and Magnetic Properties of PbTe(Ni)
    Autorzy:
    Romčević, N.
    Trajić, J.
    Romčević, M.
    Stojanović, D.
    Kuznetsova, T.
    Khokhlov, D.
    Dobrowolski, W.
    Rudolf, R.
    Anžel, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1808059.pdf
    Data publikacji:
    2009-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.20.-e
    63.20.Kr
    78.30.-j
    Opis:
    Far-infrared and magnetic properties of Ni doped PbTe ($Z_Ni$ = 1× $10^{19}$ at./$cm^{3}$) single crystal are investigated in a broad range of temperature and magnetic fields. Far-infrared reflection spectra were analyzed using a fitting procedure based on the modified plasmon-two phonon interaction model. Together with the strong plasmon-two longitudinal optical phonon coupling we obtained a local mode of Ni at about 180 $cm^{-1}$. This mode intensity depends on temperature. Magnetic measurements shows that PbTe alloys doped with Ni reveals weak ferromagnetic interaction between magnetic ions.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 4; 805-807
    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:
    Polar Phonons in Relaxor Ferroelectric 0.2PSN-0.4PMN-0.4PZN
    Autorzy:
    Macutkevič, J.
    Kamba, S.
    Pashkin, A.
    Banys, J.
    Bormanis, K.
    Sternberg, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813209.pdf
    Data publikacji:
    2008-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.30.-j
    63.20.-e
    71.55.Jv
    Opis:
    Relaxor ferroelectrics $0.2PbSc_{1//2}Nb_{1//2}O_3-0.4PbMg_{1//3}Nb_{2//3}O_3-0.4PbZn_{1//3}Nb_{2//3}O_3$ ceramics were studied by means of the Fourier transform infrared reflection and THz transmission spectroscopy in the temperature range of 20-500 K. On heating from low temperatures, the $A_1$ component of the strongly split $TO_1$ mode softens towards the Burns temperature, but the softening ceases near 400 K, which could be a signature of polar cluster percolation temperature.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 3; 879-882
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Raman Spectroscopy of Multiphonon Emission Process in Ni-Doped PbTe
    Autorzy:
    Romčević, N.
    Trajić, J.
    Hadžić, B.
    Romčević, M.
    Stojanović, D.
    Lazarević, Z.
    Kuznetsova, T.
    Khokhlov, D.
    Rudolf, R.
    Anžel, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807841.pdf
    Data publikacji:
    2009-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.28.+d
    63.20.-e
    78.30.-j
    Opis:
    In this paper, we present room temperature unpolarized Raman scattering spectra of Ni doped PbTe single crystal sample. Crystal of PbTe(Ni) was grown by the Bridgman method. The Ni concentration in the sample used here was 1× $10^{19}$ at./$cm^{3}$. Well resolved peaks appear at about 126, 143, 181, 362 and 724 $cm^{-1}$. The modes at 126 and 143 $cm^{-1}$, which are also observed in other telluride compounds, originate from vibrations in $TeO_2$. We assume that the mode at about 181 $cm^{-1}$ is connected to excitations of a local phonon mode in the vicinity of an impurity atom (donor $Ni^{3+}$ state). Modes at about 362 $cm^{-1}$ and 724 $cm^{-1}$ are the second and fourth harmonic of a local phonon mode, registered here due to multiphonon emission.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 1; 91-92
    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:
    Raman Study in Pr$\text{}_{0.5}$Ca$\text{}_{0.5}$MnO$\text{}_{3}$ Thin Films
    Autorzy:
    Tatsi, A.
    Papadopoulou, E. L.
    Lampakis, D.
    Liarokapis, E.
    Prellier, W.
    Mercey, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037101.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.Gk
    78.30.-j
    63.20.-e
    Opis:
    We report novel Raman measurements made on Pr$\text{}_{0.5}$Ca$\text{}_{0.5}$MnO$\text{}_{3}$ thin films grown on SrTiO$\text{}_{3}$ and LaAlO$\text{}_{3}$ (PCMO/STO and PCMO/LAO, respectively). The measurements were performed for a temperature range 78 K
    Źródło:
    Acta Physica Polonica A; 2004, 105, 1-2; 99-106
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of SrLaAlO$\text{}_{4}$ and SrLaGaO$\text{}_{4}$ Substrate Crystals by Raman Spectroscopy
    Autorzy:
    Drozdowski, M.
    Kozielski, M.
    Pajączkowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964243.pdf
    Data publikacji:
    1997-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.-y
    78.30.-j
    33.20.Fb
    63.20.-e
    Opis:
    In this paper the study of SrLaAlO$\text{}_{4}$ and SrLaGaO$\text{}_{4}$ single crystals using the Raman scattering method is presented. The obtained results are discussed in terms of nature of the crystallografic imperfections and point defects which might arise during the crystal growth process.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 1; 139-142
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Raman Piezospectroscopy of Phonons in Bulk 6H-SiC
    Autorzy:
    Grodecki, K.
    Wysmołek, A.
    Stępniewski, R.
    Baranowski, J.
    Hofman, W.
    Tymicki, E.
    Grasza, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791360.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.50.-p
    42.65.Dr
    63.20.-e
    78.30.-j
    Opis:
    Raman piezospectroscopy of high quality 6H-SiC crystals is presented. The crystals used in experiments were grown by the seeded physical vapor transport method. Uniaxial stress up to 0.9 MPa, obtained using a spring apparatus, was applied along [11-20] and [10-10] directions. It was found that the application of uniaxial stress led to different energy shifts of the observed phonon excitations in the investigated 6H-SiC crystals. The obtained pressure coefficients vary in the range 0.98-5.5 $cm^{-1}$ $GPa^{-1}$ for different transverse optical phonon modes. For longitudinal optic phonon modes pressure coefficients in the range 1.6-3.6 $cm^{-1}$ $GPa^{-1}$ were found. The data obtained could be useful in evaluation of local strain fields in SiC based structures and devices including epitaxial graphene.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 947-949
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vibration and Luminescence Spectroscopic Investigations of the Alkali Rare Earth Double Phosphates M$\text{}_{3}$(RE,Eu)(PO$\text{}_{4}$)$\text{}_{2}$ (M=K, Rb; RE=La, Gd)
    Autorzy:
    Kloss, M.
    Schwarz, L.
    Hölsä, J. P. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1995573.pdf
    Data publikacji:
    1999-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.50.-f
    61.66.Fn
    63.20.-e
    71.20.Dg
    71.20.Eh
    71.70.-d
    78.30.-j
    78.55.-m
    Opis:
    The room temperature IR- and Raman spectra of the different M$\text{}_{3}$RE(PO$\text{}_{4}$)$\text{}_{2}$ (M = K, Rb; RE = La, Eu, Gd) double phosphates were analysed and used to interpret the vibronic side band structure in the photoluminescence spectra. The intraconfigurational 4f-4f electronic transitions in the photoluminescence spectra of the Eu$\text{}^{3+}$ doped M$\text{}_{3}$RE(PO$\text{}_{4}$)$\text{}_{2}$ were analysed in detail. The crystal field fine structure of the $\text{}^{5}$D$\text{}_{0}$ → $\text{}^{7}$F$\text{}_{J}$ (J=0-4) transitions was analysed accounting for the information on the crystal structure. The effect of the temperature as well as the alkali host cation was evaluated. Finally, a preliminary crystal field energy level scheme for the $\text{}^{7}$F$\text{}_{J}$ (J=0-4) ground term was deduced from the analysis of the photo-luminescence as well as IR- and Raman spectra.
    Źródło:
    Acta Physica Polonica A; 1999, 95, 3; 343-349
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-15 z 15

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