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Wyświetlanie 1-15 z 327
Tytuł:
Oxidation of Polycrystalline Chromium between 30°C and 400°C
Autorzy:
Thurner, G.
Holloway, P. H.
Powiązania:
https://bibliotekanauki.pl/articles/1892527.pdf
Data publikacji:
1992-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.60.Bn
68.55.Nq
07.80.+x
Opis:
The formation of coalesced oxide films on atomically clean polycrystalline chromium has been studied with Auger electron spectroscopy and secondary ion mass spectrometry at temperatures between 30°C and 400°C. The data are consistent with an initialed chemisorption of oxygen on the clean Cr followed by nucleation of chromium oxide after 2 L of exposure followed by lateral growth to form a thin, coalesced, saturated oxide film about 0.8 nm thick at 30°C. The saturated oxide was thicker at higher temperatures, being about 80 nm thick at 400°C. Detection of a CrO$\text{}^{+}$ secondary ion was associated with chemisorbed oxygen, while O¯ ion originated from chromium oxides based upon correlation with chemical changes in the low-energy Auger spectra. Keating of the coalesced oxide caused considerable changes in both the low-energy Auger spectrum as well as the secondary ion emission. Both these as well as time-dependent, reversible changes in secondary ion emission were interpreted as structural rearrangements of the chromium oxide resulting in relative changes of oxygen either adsorbed on the surface or incorporated into chromium oxide.
Źródło:
Acta Physica Polonica A; 1992, 81, 2; 273-283
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interlayer Exchange Coupling and Giant Magnetoresistance in Magnetic Multilayers
Autorzy:
Bloemen, P. J. H.
Powiązania:
https://bibliotekanauki.pl/articles/1945210.pdf
Data publikacji:
1996-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Et
75.50.Rr
Opis:
An introduction is given on the subject of magnetic metallic multilayers. These artificial structures appear to display several fascinating physical phenomonena which are of fundamental as well as technological interest. Two examples, the magnetic coupling between ferromagnetic layers across a non-magnetic spacer layer and the giant magnetoresistance are emphasized in this article. For each of these, key experimental observations are reviewed followed by a discussion of the physical principles underlying the phenomenon.
Źródło:
Acta Physica Polonica A; 1996, 89, 3; 277-299
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural and Optical Studies of CdTe/ZnTe Superlattices with Ultrathin ZnTe Layers
Autorzy:
Mariette, H.
Jouneau, P. H
Pelekanos, N. T.
Tardot, A.
Feuilet, G.
Magnea, N.
Powiązania:
https://bibliotekanauki.pl/articles/1929608.pdf
Data publikacji:
1993-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.66.Hf
73.61.Ga
Opis:
Spatially selective introduction of ultrathin ZnTe layers (1 to 3 mono-layers) into CdTe allows the study of special superlattice structure, corresponding to a monomolecular plane-host crystal system. Particular attention is given to the strain state control of the inserted ZnTe monolayer. High resolution electron microscopy is used to measure the local lattice distortion: the method yields the location and the total amount of Zn per period, and the results are compared with X-ray diffraction data. Optical properties of these superlattices are also presented. All results show the ability to control ultrathin pseudomorphic layers of ZnTc within CdTe, with limited Zn segregation, and of high crystalline and optical quality. In addition, they can be fitted within the framework of elasticity theory for the structural data, and of a finite quantum well model for the optical ones, even in the ultimate limit of only one nominal ZnTe monolayer.
Źródło:
Acta Physica Polonica A; 1993, 84, 3; 423-433
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Temperature-Dependent Surface Structure of Metals
Autorzy:
Bonzel, H. P.
Breuer, U.
Powiązania:
https://bibliotekanauki.pl/articles/1892524.pdf
Data publikacji:
1992-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.35.Rh
68.35.Md
79.60.Cn
82.65.Dp
Opis:
Recent experimental results based on X-ray photoelectron diffraction from a Pb(110) crystal are discussed in terms of surface roughening and surface melting. In comparison to other reports on Pb(110) surface roughening it is recognized that the correct determination of the roughening transition on (110) surfaces of fcc metals may be intrinsically difficult because of anisotropy. A novel technique for investigating the temperature-dependent surface free energy is described. The method involves the quasi-steady-state shape of periodic surface profiles on Au(111) and Au(100) single crystals. First results are reported for two crystallographic zones (111)⟨112⟩ and (100)⟨110⟩ of Au. These results illustrate the strong anisotropy of Δγ/γ of ~23% and ~ 4% at T = 0 K for the (111)⟨112⟩ and (100)⟨110⟩ zones, respectively. The data suggest that the low-index surfaces of Au(111) and (100) are not likely to roughen at T ≤ T_{M}.
Źródło:
Acta Physica Polonica A; 1992, 81, 2; 265-272
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin-Orbit Coupling in n-Type PbTe/PbEuTe Quantum Wells
Autorzy:
Peres, M. L.
Chitta, V. A.
Maude, D. K.
Oliveira, N. F.
Rappl, P. H. O.
Ueta, A. Y.
Abramof, E.
Powiązania:
https://bibliotekanauki.pl/articles/2047927.pdf
Data publikacji:
2011-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.10.-d
72.25.Rb
73.20.Fz
73.63.Hs
Opis:
Magnetoresistance measurements were performed on an n-type PbTe/PbEuTe quantum well and weak antilocalization effects were observed. This indicates the presence of spin-orbit coupling phenomena and we showed that the Rashba effect is the main mechanism responsible for this spin-orbit coupling. Using the model developed by Iordanskii et al., we fitted the experimental curves and obtained the inelastic and spin-orbit scattering times. Thus we could compare the zero field energy spin-splitting predicted by the Rashba theory with the energy spin-splitting obtained from the analysis of the experimental curves. The final result confirms the theoretical prediction of strong Rashba effect on IV-VI based quantum wells.
Źródło:
Acta Physica Polonica A; 2011, 119, 5; 602-605
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optically Detected Magnetic Resonance Studies of Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te (x=0.095, 0.007)
Autorzy:
Godlewski, M.
Świątek, K.
Gałązka, R. R.
Monemar, B.
van Loosdrecht, P. H. M.
Wittlin, A.
Perenboom, J. A. A. J.
Powiązania:
https://bibliotekanauki.pl/articles/1929637.pdf
Data publikacji:
1993-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.70.Hb
78.55.Et
71.35.+z
Opis:
The dominant mechanism responsible for the optical detection of the Mn$\text{}^{2+}$ magnetic resonance in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te (x = 0.095, 0.007) is explained. By either change of the external magnetic field or by setting the conditions for the Mn$\text{}^{2+}$ magnetic resonance, we could change the relative efficiencies of the two competing excitonic recombination processes. By lowering magnetization at the magnetic resonance, recombination via the acceptor bound exciton channel, which is mainly nonradiative, is enhanced. Then, a large up to 50% decrease in the total photoluminescence efficiency was observed in the optically detected magnetic resonance experiment. Such observation allows for verification of the large efficiency of the Auger-type transition responsible for the nonradiative decay of the acceptor bound exciton.
Źródło:
Acta Physica Polonica A; 1993, 84, 3; 539-542
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cross Relaxation and Energy Transfer in Cs$\text{}_{2}$NaSm$\text{}_{x}$Eu$\text{}_{y}$Y$\text{}_{1-x-y}$Cl$\text{}_{6}$
Autorzy:
Luxbacher, T.
Fritzer, H. P.
Flint, C. D.
Powiązania:
https://bibliotekanauki.pl/articles/1945499.pdf
Data publikacji:
1996-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.5.-j
34.50.Gb
78.55.Hx
Opis:
Luminescence decay curves have been measured for the Sm$\text{}^{3+}$ $\text{}^{4}$G $\text{}_{5}\text{}_{/}\text{}_{2}$ → $\text{}^{6}$H $\text{}_{7}\text{}_{/}\text{}_{2}$ emission in the cubic crystal Cs$\text{}_{2}$NaSm$\text{}_{x}$Eu$\text{}_{y}$Y$\text{}_{1-x-y}$Cl$\text{}_{6}$ (x = 0.005 to x = 1, y = 0 to y = 0.99) over the temperature range 10 K to 300 K using pulsed laser excitation into the $\text{}^{4}$G $\text{}_{5}\text{}_{/}\text{}_{2}$ state of Sm$\text{}^{3+}$. The luminescence from the $\text{}^{4}$G $\text{}_{5}\text{}_{/}\text{}_{2}$ state of Sm$\text{}^{3+}$ is strongly quenched by both, cross relaxation to nearest-neighbour Sm$\text{}^{3+}$ ions and energy transfer to the $\text{}^{5}$D$\text{}_{0}$ state of Eu$\text{}^{3+}$. We interpret these processes in terms of a recently developed discrete shell model. The dependence of energy transfer from the Sm$\text{}^{3+}$ donor ion to Eu$\text{}^{3+}$ acceptor ions on y is readily studied and modelled. The temperature dependence shows that the cross relaxation occurs mainly by electric dipole vibronic-electric dipole vibronic interaction while in the energy-transfer process magnetic dipole allowed electronic contributions are also involved.
Źródło:
Acta Physica Polonica A; 1996, 90, 1; 161-168
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature Dependence of Luminescence Decay from the $\text{}^{4}$G $\text{}_{5}\text{}_{/}\text{}_{2}$ State of Sm$\text{}^{3+}$ in Cs$\text{}_{2}$NaSm$\text{}_{x}$Y$\text{}_{1-x}$Cl$\text{}_{6}$ and Cs$\text{}_{2}$NaSm$\text{}_{x}$Eu$\text{}_{y}$Y$\text{}_{1-x-y}$Cl$\text{}_{6}$
Autorzy:
Luxbacher, T.
Fritzer, H. P.
Flint, C. D.
Powiązania:
https://bibliotekanauki.pl/articles/1945619.pdf
Data publikacji:
1996-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.50.Dq
33.50.Hv
78.55.Hx
Opis:
Luminescence decay curves for the $\text{}^{4}$G $\text{}_{5}\text{}_{/}\text{}_{2}$ → $\text{}^{6}$H $\text{}_{7}\text{}_{/}\text{}_{2}$ emission of Sm$\text{}^{3+}$ in the cubic hexachloroelpasolite crystals Cs$\text{}_{2}$NaSm$\text{}_{x}$Y$\text{}_{1-x}$Cl$\text{}_{6}$ (x=0.005 to x=1) and Cs$\text{}_{2}$NaSm$\text{}_{x}$Eu$\text{}_{y}$Y$\text{}_{1-x-y}$Cl$\text{}_{6}$ (x=0.01 to x=0.95, y=0.05 to y =0.99) have been measured over the temperature range 10 K to 300 K using pulsed laser excitation into the $\text{}^{4}$G $\text{}_{5}\text{}_{/}\text{}_{2}$ state of Sm$\text{}^{3+}$. The luminescence from this state is strongly quenched by cross relaxation to Sm$\text{}^{3+}$ acceptors and energy transfer to the $\text{}^{5}$D$\text{}_{0}$ state of Eu$\text{}^{3+}$. The temperature dependence of cross relaxation and of energy transfer is discussed in terms of the involved mechanisms.
Źródło:
Acta Physica Polonica A; 1996, 90, 2; 307-313
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laser Raman and Infrared Absorption Spectra of 2,4-dichloronitrobenzene
Autorzy:
Rastogi, V. K.
Jain, D. K.
Mital, H. P.
Sharma, S. N.
Powiązania:
https://bibliotekanauki.pl/articles/1887676.pdf
Data publikacji:
1991-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.20.Ea
33.20.Fb
33.20.Lg
Opis:
The laser Raman and infrared absorption spectra of 2,4-dichloronitrobenzene have been recorded in pure liquid state. The vibrational spectra have been analysed assuming C$\text{}_{s}$, point group for the molecule. The assignments for fundamental vibrations, combination and overtone frequencies and internal modes of vibrations of NO$\text{}_{2}$ group have been proposed.
Źródło:
Acta Physica Polonica A; 1991, 79, 6; 765-774
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unusual Time Dependence of Magnetization Relaxation in MBE Grown Epilayer of CdMnTe
Autorzy:
Witowski, A. M.
Moll, H. P.
Wyder, P.
Karczewski, G.
Wojtowicz, T.
Kossut, J.
Powiązania:
https://bibliotekanauki.pl/articles/1934049.pdf
Data publikacji:
1995-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.60.Wm
76.30.Fc
Opis:
The temporal behavior of the magnetization due to the spin-lattice relaxation for bulk and MBE grown epilayer of CdMnTe is compared. The time dependence of the epilayer magnetization changes (dM/dt) is nonmonotonic. After the main part, a second structure appears. It can be explained only by the assumption of energy storage and a delayed additional rise of specimen temperature. The nature of the storage is unknown.
Źródło:
Acta Physica Polonica A; 1995, 88, 5; 953-956
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Role of Hole Localization in the Magneto-Luminescence of a Two-Dimensional Electron Gas
Autorzy:
Calleja, J. M.
Sarkar, D.
van der Meulen, H. P.
Hey, R.
Friedland, K. J.
Ploog, K.
Powiązania:
https://bibliotekanauki.pl/articles/2038327.pdf
Data publikacji:
2004-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.43.Lp
78.55.Cr
73.21.-b
Opis:
We investigate the effect of hole localization on the magneto-luminescence emission of a two-dimensional electron system formed in a modulation-doped semiconductor heterojunction. The emission of heterojunctions containing a dilute delta-layer of Be acceptors at a large distance from the interface is compared with that of Be-free samples. A narrow Fermi-edge singularity emission line is observed at low temperature in Be-doped samples, involving electrons in the second confined state. The evolution of this line in a perpendicular magnetic field shows common characteristics with previously reported results in high mobility samples not containing Be. A new emission line appears abruptly at filling factor 2 originating by the recombination of electrons in the lowest Landau level with free valence holes, independent of the presence of Be. The abruptness of this transition, which is also observed in some samples at filling factor 1, reveals a simultaneous change in the electron system over a macroscopic sample area. The new optical emission shows marked deviations with respect to the single-particle behavior, which are tentatively interpreted as the formation of a complex state involving a free photocreated hole and the electron system. This complex unbinds when the Fermi level crosses the mobility edge.
Źródło:
Acta Physica Polonica A; 2004, 106, 3; 329-340
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diffraction Studies of Nanocrystals: Theory and Experiment
Autorzy:
Palosz, B.
Grzanka, E.
Gierlotka, S.
Stel'makh, S.
Pielaszek, R.
Bismayer, U.
Neuefeind, J.
Weber, H.-P.
Palosz, W.
Powiązania:
https://bibliotekanauki.pl/articles/2035453.pdf
Data publikacji:
2002-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.46.+w
Opis:
Based on theoretical calculations of powder diffraction data it is shown that the assumption of the infinite crystal lattice for small particles is not justified, leads to significant changes of the diffraction patterns, and may lead to erroneous interpretation of the experimental results. An alternate evaluation of diffraction data of nanoparticles, based on the so-called "apparent lattice parameter", alp, is proposed.
Źródło:
Acta Physica Polonica A; 2002, 102, 1; 57-82
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optically-Determined Exciton Transport in GaAs Structures
Autorzy:
Gililand, G. D.
Wolford, D. J
Hjalmarson, H. P
Petrovic, M. S.
Klem, J.
Kuech, T. F.
Northrop, G. A.
Bradley, J. A.
Powiązania:
https://bibliotekanauki.pl/articles/1929606.pdf
Data publikacji:
1993-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.47.+p
72.80.Ey
Opis:
We have used an all-optical photoluminescence-imaging technique to measure excitonic transport in three types of GaAs structures in which the excitonic transitions vary from allowed direct-gap excitons to forbidden, doubly-indirect Type-II excitons. We f nd remarkable differences in the transport properties of these excitons. Our studies show that bulk free-exciton transport exhibits an anomalous laser power-dependent diffusivity, whereas quasi-2D interfacial excitons and Type-II cross-interface excitons do not. Additionally, we observe localization of cross-interface excitons at the potential disorder induced by the heterointerface roughness.
Źródło:
Acta Physica Polonica A; 1993, 84, 3; 409-417
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of p-Layer Doping Density and Surface Band Bending on the Indium Tin Oxide/Hydrogenated Amorphous Silicon Heterojunction Solar Cells
Autorzy:
Rached, D.
Madani Yssad, H.
Powiązania:
https://bibliotekanauki.pl/articles/1398948.pdf
Data publikacji:
2015-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.61.Jc
71.20.Mq
88.40.hj
88.40.jj
Opis:
A solar cell (indium tin oxide (ITO)/p-doped amorphous silicon (p-a-Si:H)/intrinsic polymorphous silicon (i-pm-Si:H)/n-doped crystalline silicon (n-c-Si)) simulation, focused on p-layer doping density NA and surface band bending $E_\text{sbb}$ at the interface ITO/p-layer has been performed. Despite the deterioration of p-layer material quality with doping density, the reduced bulk recombination was found to compensate for the increased loss in the p-layer. An increase of p-layer doping density NA and contact barrier height $\phi_{b0}$ (variation of the surface band bending $E_\text{sbb}$) leads to an increase of the efficiency of heterojunction with intrinsic thin layer solar cells.
Źródło:
Acta Physica Polonica A; 2015, 127, 3; 767-769
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Guest-Host Interactions in Nematic p-Cyano-p-Alkylphenylcyclohexanes
Autorzy:
Bauman, D.
Moryson, H.
Jadżyn, J.
Powiązania:
https://bibliotekanauki.pl/articles/1930624.pdf
Data publikacji:
1994-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.30.Gd
64.70.Md
Opis:
Studies of the temperature dependence of the guest order parameter for binary mixtures of the dichroic azo dye in the homologous series of the p-cyano-p'-alkylphenylcyclohexane were performed. Odd-even effect for the order parameter value was observed. A correlation between the shift in the nematic-isotropic transition temperature after dye addition and the orientation of the guest molecules in the nematic host was discussed.
Źródło:
Acta Physica Polonica A; 1994, 85, 3; 553-562
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 327

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