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Wyświetlanie 1-15 z 24
Tytuł:
Ce$\text{}_{3}$Cu$\text{}_{3}$Sb$\text{}^{4}$: a Canted Antiferromagnetic Semimetal
Autorzy:
Wachter, P.
Degiorgi, L.
Wetzel, G.
Schwer, H.
Mattenberger, K.
Herrmannsdörfer, T.
Fischer, P.
Powiązania:
https://bibliotekanauki.pl/articles/2011219.pdf
Data publikacji:
2000-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.-m
78.20-e
72.15.Eb
72.15.Gd
Opis:
It has been claimed by Patil et al., that Ce$\text{}_{3}$Cu$\text{}_{3}$Sb$\text{}_{4}$ is the first Ce-based semiconducting ferromagnet. In this paper it is shown, mainly with Hall effect and far infrared spectroscopy that no gap in the excitation spectrum exists, as well above as below the magnetic ordering temperature. A maximum in the resistivity near T$\text{}_{C}$ is due to trapped magnetic polarons. The resistivity is an effect of the mobility of the charge carriers. The structure of the magnetic unit cell has been determined with elastic neutron scattering.
Źródło:
Acta Physica Polonica A; 2000, 97, 1; 43-58
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
IINS, FT-IR and DFT Study of the Internal Dynamics of $[4-apyH][SbCl_4]$
Autorzy:
Hołderna-Natkaniec, K.
Natkaniec, I.
Mikuli, E.
Swiergiel, J.
Khavryutchenko, V.
Jakubas, R.
Powiązania:
https://bibliotekanauki.pl/articles/1813168.pdf
Data publikacji:
2008-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Nx
33.20.Ea
77.84.-s
31.15.E-
Opis:
A combination of infrared and inelastic incoherent neutron scattering spectroscopies with the density functional theory and semi-empirical calculations was applied to propose an assignment of the vibrational spectra of 4-aminopyridine chloroantimonate(IV).
Źródło:
Acta Physica Polonica A; 2008, 113, 4; 1117-1130
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Near IR Refractive Index for GaInN Heavily Doped with Silicon
Autorzy:
Cywiński, G.
Kudrawiec, R.
Rzodkiewicz, W.
Kryśko, M.
Litwin-Staszewska, E.
Misiewicz, J.
Skierbiszewski, C.
Powiązania:
https://bibliotekanauki.pl/articles/1791356.pdf
Data publikacji:
2009-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.uj
78.66.Fd
81.15.Hi
68.55.-a
78.20.-e
Opis:
The authors report on growth and results of infrared measurements of GaInN heavily doped with silicon. The lattice matched to GaN epitaxial layer of $Ga_{0.998}In_{0.002}N:Si$ has been grown in plasma assisted molecular beam epitaxy in the metal rich conditions. The room temperature Hall concentration and mobility of electrons are 2× $10^{20} cm^{-3}$ and 67 $cm^{2}$/(Vs), respectively. The refractive index has been determined by variable angle spectroscopic ellipsometry. The refractive index exhibited a significant reduction of its value (from 2.25 to 2 at 1.55 μm) at near IR range where are the main interests of potential applications for nitride based intersubband devices. Reported here values of refractive indices at 1.55 and 1.3 μm are appropriate for fabrication of cladding layers with the required contrast to GaN for intersubband devices. The observed drop of refractive index is attributed to the carrier-induced plasma edge effect, which has been directly observed in reflectance spectrum.
Źródło:
Acta Physica Polonica A; 2009, 116, 5; 936-938
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dielectric Properties of Ferroelectric Liquid Crystals with Diversified Molecular Structure
Autorzy:
Czerwiec, J.
Dąbrowski, R.
Żurowska, M.
Ziobro, D.
Wróbel, S.
Powiązania:
https://bibliotekanauki.pl/articles/1538235.pdf
Data publikacji:
2010-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.84.Nh
78.15.+e
64.70.M-
Opis:
Mesomorphic, thermodynamic, electro-optic and dielectric properties of three homologues of fluorosubstituted esters are described. Full chemical names of these compounds are as follows: (S)-(+)-4-(1-metyl-hepty-loksy)benzoate-(6-penta-fluoro-propano-ynloxyhex-1-oxy)-biphenyl-4-yl (in short 2F6BBiOC8), (S)-(+)-4-(1-metyl-hepty-loksy)benzoate-(6-nona-fluoro-pentano-yloxyhex-1-oxy)-biphenyl-4-yl (in short 4F6BBiOC8), (S)-(+)-4-(1-metyl-hepty-loksy)benzoate-(6-trideca-fluoro-heptano-yloxyhex-1-oxy)-biphenyl-4-yl (in short 6F6BBiOC8). The compounds exhibit ferroelectric smectic C* phase between crystalline and isotropic phase. Only one compound (6F6BBiOC8) shows antiferroelectric phase $(SmC_{A}^\ast)$ observed by dielectric spectroscopy, but the range of this phase is narrow of about 2°. All three compounds exhibit in the SmC* phase Goldstone mode and Maxwell-Wagner relaxation hidden in the conductivity contribution at low frequencies, whereas in the $SmC_{A}^\ast$ phase two anti-ferroelectric modes (AFM1) and (AFM2) contribute to the dielectric spectrum. The compounds were studied using differential scanning calorimetric, frequency domain dielectric spectroscopy, and reversal currents method to determine spontaneous polarization.
Źródło:
Acta Physica Polonica A; 2010, 117, 4; 553-556
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Room Temperature Ferroelectric Mixture of Chiral and Achiral Thioesters
Autorzy:
Czerwiec, J.
Ossowska-Chruściel, M.
Chruściel, J.
Wróbel, S.
Powiązania:
https://bibliotekanauki.pl/articles/1538218.pdf
Data publikacji:
2010-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.84.Nh
78.15.+e
64.70.M-
Opis:
Dielectric properties of the mixture of two thioester compounds: 4-8-alkoxy-benzoate-thio-carboxyl S-4-pentyl-phenyl (8OS5), (s)-4-(1-methyl-heptyloxy)biphenyl-4-thio-carboksyl 4-9-alkil-phenyl (MHOBS9) are presented. The chiral compound exhibits nematic (N*) and ferroelectric smectic C* phase (SmC*). The achiral compound shows N, SmA and monotropic SmC and SmB phases. the mixture of both compounds of 0.5 molar fraction shows SmC* in the wider temperature range than pure MHOBS9. The mixture was studied using frequency domain dielectric spectroscopy. Dielectric measurements for the SmC* phase of the mixture revealed Goldstone mode at higher frequencies and Maxwell-Wagner relaxation at low frequencies.
Źródło:
Acta Physica Polonica A; 2010, 117, 4; 549-552
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Refractive Indices, Density and Order Parameters of Two Nematogens and Their Eutectic Mixture
Autorzy:
Datta Sarkar, S.
Choudhury, B.
Powiązania:
https://bibliotekanauki.pl/articles/1535803.pdf
Data publikacji:
2010-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.15.+e
64.70.M-
Opis:
The compounds 5-pentyl-2-(4'-cyanophenyl) pyrimidine [CM 7035] and 4-n-butyl-4'-ethoxytolan [PTP4O2] and mixtures of different mole fractions of them show nematic phase with supercooling effect. From the phase diagram the equimolar mixture is found to be the eutectic mixture. Temperature variation of the density and refractive indices ($n_{o}$, $n_{e}$) of the pure compounds and their eutectic mixture have been reported here. The density and birefringence values of the eutectic mixture are found to be less than that of pure compounds. However the average refractive index values of eutectic mixture almost coincide with those of CM 7035 which are much less than those of PTP4O2. The refractive indices and density values have been analyzed to obtain the orientational order parameters. Experimental order parameter values of the pure compounds and the eutectic mixture are compared with theoretical Maier-Saupe values. The possible reasons for disagreement between theoretical and experimental values for the pure compounds are discussed. The agreement between theoretical and experimental order parameters are fairly good for the eutectic mixture.
Źródło:
Acta Physica Polonica A; 2010, 118, 4; 665-669
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of Optical and Photoelectrical Properties of ZnO Crystals
Autorzy:
Onufrijevs, P.
Serevičius, T.
Scajev, P.
Manolis, G.
Medvids, A.
Chernyak, L.
Kuokstis, E.
Yang, C.
Jarasiunas, K.
Powiązania:
https://bibliotekanauki.pl/articles/1506285.pdf
Data publikacji:
2011-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.15.+e
78.45.+h
78.30.Fs
Opis:
We characterized optical and photoelectrical properties of undoped and Ga-doped ZnO layers differently grown on sapphire substrates by using complementary optical methods. Different stimulated emission threshold values for ZnO epitaxial layers grown by pulsed laser deposition and MBE methods were attributed to crystalline quality of the layers and the growth method used. Different carrier lifetimes in various ZnO epitaxial layers are explained by defect-related and intrinsic mechanisms of recombination.
Źródło:
Acta Physica Polonica A; 2011, 119, 2; 274-276
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Characteristics and Optical Properties of Thermally Oxidized Zinc Films
Autorzy:
Rusu, D.
Rusu, G.
Luca, D.
Powiązania:
https://bibliotekanauki.pl/articles/1505094.pdf
Data publikacji:
2011-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.55.hf
68.55.-a
68.55.J-
81.15.Aa
78.20.-e
Opis:
Zinc oxide (ZnO) thin films (with thickness ranged from 780 nm to 1150 nm) were prepared by thermal oxidation in air (at 600-700 K, for 20-30 min) of vacuum evaporated metallic zinc films. The Zn films were deposited on glass substrates at room temperature. The crystalline structure of ZnO thin film samples was investigated using X-ray diffraction technique. The diffraction patterns revealed that the ZnO thin films were polycrystalline and have a wurtzite (hexagonal) structure. The film crystallites are preferentially oriented with (002) planes parallel to substrate surface. Some important structural parameters (lattice parameters of the hexagonal cell, crystallite size, Zn-O bond length, residual stress, etc.) of the films were determined. The surface morphology of the prepared ZnO thin films, investigated by atomic force microscopy, revealed a uniform columnar structure. The spectral dependence of transmission coefficient has been studied in the wavelength range from 300 nm to 1700 nm. The optical energy band gap calculated from the absorption spectra (supposing allowed direct band-to-band transitions) are in the range 3.17-3.19 eV. The dependence of the microstructural and optical characteristics on the preparation conditions (oxidation temperature, oxidation time, etc.) of the oxidized zinc films is discussed.
Źródło:
Acta Physica Polonica A; 2011, 119, 6; 850-856
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis of Bismuth Oxide Thin Films Deposited by Reactive Magnetron Sputtering
Autorzy:
Iljinas, A.
Burinskas, S.
Dudonis, J.
Powiązania:
https://bibliotekanauki.pl/articles/1503904.pdf
Data publikacji:
2011-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.Cd
68.55.-a
78.20.-e
Opis:
In this work $Bi_2O_3$ thin films were deposited onto the Si (111) and soda lime glass substrates by the reactive direct current magnetron sputtering system using pure Bi as a sputtering target. The dependences of electro-optical characteristics of the films on the substrate type and temperature were investigated. Transmittance and reflectance of the $Bi_2O_3$ films were measured with ultraviolet and visible light spectrometer. It was found that the substrate temperature during deposition has a very strong influence on the phase components of thin films. The results indicate that the direct allowed transitions dominate in the films obtained in this work. For the direct allowed transitions the band gap energy is found to be about 1.98 eV and 2.2 eV. The reflectance of thin bismuth oxide film depends on the substrate. Small transparency of thin films grown on glass is more related to large reflectance than absorption. The reflectance spectra of the bismuth oxide thin films deposited on the Si substrates show higher quality of optical characteristics compared to the samples deposited on glass substrates.
Źródło:
Acta Physica Polonica A; 2011, 120, 1; 60-62
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Temperature on the Refractive Indices of Liquid Crystals and Validation of a Modified Four-Parameter Model
Autorzy:
Thingujam, K.
Sarkar, S.
Choudhury, B.
Bhattacharjee, A.
Powiązania:
https://bibliotekanauki.pl/articles/1418322.pdf
Data publikacji:
2012-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.15.+e
78.20.Fm
64.70.M-
Opis:
The variation of refractive indices with temperature of three pure nematogenic compounds 5OCB, CPHB and 6CHBT were studied experimentally using thin prism technique. The refractive indices $n_{o}$ and $n_{e}$ were measured using 633 nm lines from a He-Ne laser. A modified four-parameter model was taken which is based on the Vuks equation describing the effect of temperature on the refractive indices of liquid crystals. In this paper we report the variation of refractive indices of these three liquid crystals with temperature, using the thin prism method. The variation in birefringence was determined experimentally. The variation in refractive indices and birefringence were also fitted theoretically using the modified Vuks equation. On comparison, the theoretically fitted values show close agreement with the experimental values.
Źródło:
Acta Physica Polonica A; 2012, 122, 4; 754-757
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Equimolecular Mixture of Calamitic and Bent-Core Thiobenzoates
Autorzy:
Chruściel, J.
Wantusiak, B.
Ossowska-Chruściel, M.
Powiązania:
https://bibliotekanauki.pl/articles/1419573.pdf
Data publikacji:
2012-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.30.-v
64.70.M-
78.15.+e
Opis:
This article reports on the new results on phase transitions, mesomorphic and electro-optical properties of new equimolecular mixture of calamitic and bent-core thiobenzoates. Two following liquid crystals were the components of the binary mixture: (S)-(+)-4-(1-methylheptyloxy)biphenyl 4'-octylthiobenzoate (MHOBS8) having rode-like, calamitic-chiral molecules possessing among others ferroelectric smectic C (SmC*) and bis [4-(4'-octylphenylthiocarbonyl)phenyl] isophtalates from a homologous series of banana-shaped thioesters, referred to as IFOS8, where n = 8 denoted the number of carbon atoms in terminal alkyl chains in both mesogens, synthesized by us. The IFOS8 compound has two enantiotropic phases: B2 with antiferroelectric order and B6. The mesomorphic properties were investigated by means of three complementary methods: differential scanning calorimetry, polarized light optical microscopy, and transmitted light intensity. Electro-optical measurements were also carried out.
Źródło:
Acta Physica Polonica A; 2012, 122, 2; 375-377
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Modified Interference Wedge Method in Measurements of Indices of Refraction and Birefringence of Nematic Liquid Crystals
Autorzy:
Kowiorski, K.
Kędzierski, J.
Raszewski, Z.
Kojdecki, M.
Herman, J.
Miszczyk, E.
Piecek, W.
Powiązania:
https://bibliotekanauki.pl/articles/1399015.pdf
Data publikacji:
2013-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.15.+e
Opis:
Wedge cell filled with a homogeneously oriented nematic liquid crystal was exploited as an interference wedge to measuring indices of refraction. Interference fringes from the wedge were observed in polarised light in reflection or transmission mode of a polarisation microscope to determining ordinary and extraordinary indices of refraction or birefringence (i.e. anisotropy of both indices). The interference fringes close to wedge apex were uniform and could be well described in two-beam interference approximation. The refractive indices were computed with using simple formulae involving only distances between subsequent fringes in a cell filled with the liquid crystal and an empty reference cell. Several new highly-birefringent nematic mixtures produced in the Military University of Technology were investigated. The 6CHBT nematic was used as the reference material.
Źródło:
Acta Physica Polonica A; 2013, 124, 6; 946-948
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Behavior of $Co^{2+}$ Cations in the Aqueous and Alcoholic Solution of $CoCl_2 \cdot 6H_2O$
Autorzy:
Petkova, P.
Nedkov, V.
Powiązania:
https://bibliotekanauki.pl/articles/1399687.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.15.+e
78.40.Dw
Opis:
We investigated the optical properties of $Co^{2+}$ cations in the aqueous and alcoholic solution of $CoCl_2 \cdot 6H_2O$ at room temperature. We measured the absorption spectra of these solutions in the spectral region 395-800 nm. The Racah parameters and the exchange integrals of the aqueous complex $[Co(H_2O)_6]^{2+}$ are calculated. The parameters $D_{t}$ and $D_{s}$ are also calculated on the basis of our experimental data. The parameters δ σ and δπ which are connected with the symmetry of this complex are also determined.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 207-208
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of Optical Properties of Ag, Cu, and Co Nanoparticles Synthesized in Organic Medium
Autorzy:
Kaminskienė, Ž.
Prosyčevas, I.
Stonkutė, J.
Guobienė, A.
Powiązania:
https://bibliotekanauki.pl/articles/1400397.pdf
Data publikacji:
2013-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.15.+e
78.20.Bh
78.20.Ci
42.25.Bs
Opis:
The surface plasmon resonance evaluation of colloidal metal nanoparticles, synthesized in organic medium, is reported in this work. Metal salts were dissolved in dioxane/AOT solution and reduced by hydrazine hydrate under vigorous stirring. Optical properties of obtained colloidal nanoparticles were investigated by UV-VIS spectroscopy. Theoretical predictions of optical properties of metal nanoparticles were made by means of the Mie theory and the Drude free-electron model. Geometrical parameters and distribution of metal nanoparticles in colloidal solutions were characterized by atomic force microscopy. The results show that Ag, Cu, and Co nanoparticles, synthesized in organic medium distinguish plasmonic properties. Surface plasmon resonance bands were obtained in all cases: Ag - at 430 nm, Cu - at 570 nm, Co - at 350 nm (SPR1) and 430 nm (SPR2). Comparing theoretical evaluation of nanoparticles size with atomic force microscopy analysis, we can assume that our calculations are accurate. It was found that dominating nanoparticles diameter in Ag colloidal solution is ≈ 150 nm, in Cu colloidal solution is ≈ 70 - 80 nm and in Co colloidal solution is ≈ 150 nm. It can be concluded that nanoparticles with enhanced plasmonic properties synthesized in organic medium can be widely used in order to increase efficiency of various optical elements.
Źródło:
Acta Physica Polonica A; 2013, 123, 1; 111-114
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some Optical Aspects of Thermally Evaporated Lead Oxide Thin Films
Autorzy:
Aly, S.
Kaid, M.
El-Sayed, N.
Powiązania:
https://bibliotekanauki.pl/articles/1399301.pdf
Data publikacji:
2013-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.55.-g
81.15.-z
78.20.-e
78.20.Ci
78.40.-q
Opis:
The optical properties of lead oxide samples prepared using thermal evaporation technique on unheated glass substrates with different film thicknesses have been studied. The structural characteristics of a lead oxide sample was investigated using X-ray diffraction and it is confirmed to be in the amorphous state. The optical properties of the prepared films were studied by transmittance and reflectance measurements, and the integrated transmittance ($T_\text{UV}$, $T_\text{VIS}$ and $T_\text{Sol}$) in ultraviolet, visible and solar regions was calculated and found to be affected by film thickness. The dependence of absorption coefficient on wavelength was also reported. The energy gap was calculated and has been observed around 3.7 eV.
Źródło:
Acta Physica Polonica A; 2013, 124, 4; 713-716
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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