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Tytuł:
Rutherford Backscattering Angular Yields under Channeling Conditions for H$\text{}^{+}$ and H$\text{}^{0}$ Projectiles
Autorzy:
Czerbniak, J.
Moneta, M.
Pudłowski, G.
Powiązania:
https://bibliotekanauki.pl/articles/2030727.pdf
Data publikacji:
2002-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.45.Gm
Opis:
The Rutherford backscattering angular scattering yields for 100 keV H$\text{}^{+}$ and H$\text{}^{0}$ projectiles from Si crystal was measured. The analysis of results using Monte Carlo simulations leads to the conclusion that H$\text{}^{0}$ beam suffers smaller dispersion than H$\text{}^{+}$ beam, when crossing crystal surface. It means that the H$\text{}^{0}$ scattering probability is smaller at large impact parameters. For greater penetration depth the channeling process turns out to be the same.
Źródło:
Acta Physica Polonica A; 2002, 101, 6; 857-863
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
s-p-d-f Exchange Interactions in Mn and Eu Based IV-VI Semimagnetic Semiconductors
Autorzy:
Dietl, T.
Bauer, G.
Powiązania:
https://bibliotekanauki.pl/articles/1921647.pdf
Data publikacji:
1992-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.70.Gm
Opis:
We evaluated exchange integrals which describe the spin dependent coupling between effective mass electrons and localized spins in the IV-VI semi-magnetic semiconductors taking into account contributions from the direct Coulomb exchange as well as from the hybridization between band states and magnetic shells. The obtained constants compare favorably with the experimental values for both the Mn- and the Eu-based compounds. We also discuss some peculiarities of IV-VI semimagnetic semiconductors, which may render the virtual-crystal approximation invalid.
Źródło:
Acta Physica Polonica A; 1992, 82, 5; 729-732
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stopping and Straggling of Slow Atoms in Electron Gas
Autorzy:
Moneta, M.
Powiązania:
https://bibliotekanauki.pl/articles/1968487.pdf
Data publikacji:
1997-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.45.Gm
Opis:
New analytical formulas for the electronic stopping power and the energy loss straggling of low velocity heavy atoms in the degenerate electron gas are calculated within the dielectric function method. The stopping and straggling effective charges of a projectile were analyzed. They are found to differ each other and to depend on the electron gas density r$\text{}_{s}$, on the projectile atomic number Z$\text{}_{i}$ and on the projectile degree of ionization ζ.
Źródło:
Acta Physica Polonica A; 1997, 92, 6; 1169-1176
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature Damping of Plasmons in Nonparabolic Band
Autorzy:
Goettig, Stefan
Powiązania:
https://bibliotekanauki.pl/articles/1886779.pdf
Data publikacji:
1991-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.45.Gm
Opis:
Damping of plasmons in the nonparabolic free-carrier band of a semiconductor is considered within RPA. Due to the nonparabolic band shape the temperature broadening of plasmons is strongly reduced and even at high temperatures plasmons with large wavevectors may exist as undamped excitations.
Źródło:
Acta Physica Polonica A; 1991, 79, 2-3; 333-336
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The special situation of GM feeds in Poland in the light of the latest case law of the Court of Justice of the European Union
Autorzy:
Zimny, Tomasz
Twardowski, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/704416.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
new plant breeding techniques (NBT)
GM feed
GM food
GMO
Opis:
We discus legal status of plants obtained using NBT: whether they are to be treated as GMOs or not. The conclusion may have a negative impact on the development of research on them and their practical use. The problem of the application of provisions on GMOs in relation to the products of some of the NBT has been the subject of the decision of the Court of Justice of the European Union (CJEU) in Case C-528/16 – this topic is analyzed in details.
Źródło:
Nauka; 2019, 1
1231-8515
Pojawia się w:
Nauka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Double Exchange in Mixed-Valency Diluted Magnetic Semiconductors
Autorzy:
Blinowski, J.
Kacman, P.
Powiązania:
https://bibliotekanauki.pl/articles/1947969.pdf
Data publikacji:
1996-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.70.Gm
75.30.Et
Opis:
The role of double-exchange, a non-Heisenberg spin-spin interaction between the magnetic ions of identical chemical nature but different charge states, in the mixed-valency diluted magnetic semiconductors is discussed. The mechanism correlates the spins of magnetic ions by virtual hopping of a d-electron from one ion to the other via the p-band states. We calculate the energy spectrum for pairs of magnetic ions within the charged ionic clusters stabilized by the charge-charge correlations, taking into account simultaneously both the double and the superexchange. The ferromagnetic, non-Heisenberg double exchange might compete with the Heisenberg-like, ferrimagnetic superexchange, thus resulting in canted alignments of ionic spins.
Źródło:
Acta Physica Polonica A; 1996, 90, 4; 731-734
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
s,p-d Exchange Constants of ZnFeTe Diluted Magnetic Semiconductor
Autorzy:
Mac, W.
Herbich, M.
Nguyen, The Khoi
Twardowski, A.
Shapira, Y.
Demianiuk, M.
Powiązania:
https://bibliotekanauki.pl/articles/1933919.pdf
Data publikacji:
1995-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Ls
71.70.Gm
Opis:
Reflectance and degree of polarization of reflectance of the free exciton in Zn$\text{}_{1-x}$Fe$\text{}_{x}$Te (x ≈ 0.002) was measured at T = 1.9 K and magnetic field up to 5 T. Combining the exciton splitting with the magnetization data we estimated the exchange constant N$\text{}_{0}$(α-β) = 2.1 eV.
Źródło:
Acta Physica Polonica A; 1995, 88, 5; 845-848
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Static Local Field Factor and Ground State Properties of Interacting Electron Gas
Autorzy:
Sarkar, A.
Haldar, S.
Roy, D.
Sen, D.
Powiązania:
https://bibliotekanauki.pl/articles/2038378.pdf
Data publikacji:
2004-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.10.-w
71.45.Gm
Opis:
In the most general case, the calculation of the static local field factor G(q) for the unpolarised electron gas requires the knowledge of exchange-correlation energy functionals for both the parallel and antiparallel relative spin orientations of the electron gas system. Accurate density interpolation formulae using the quantum Monte Carlo data of Ceperley-Alder for the correlation energy of electron gas in both the "para" and "ferro" states, respectively, in the given density range are used for the calculation of G( q). Fulfilment of relevant consistency criteria is ensured and the local field factor so obtained renders significant improvement of ab initio pseudopotential calculation of effective interaction of Al. The Levin like interpolant of the correlation energy Ceperley-Alder data has been further used to study the ground state properties of the electron gas. It is also noted that a better understanding of the interacting electron gas properties requires a more accurate spin interpolation formula for the correlation energy than the existing ones.
Źródło:
Acta Physica Polonica A; 2004, 106, 4; 497-514
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dielectric Properties and Electron Spectrum of the Müller Model in the High-Temperature Superconductivity Theory
Autorzy:
Stasyuk, I. V.
Shvaika, A. M.
Powiązania:
https://bibliotekanauki.pl/articles/1929563.pdf
Data publikacji:
1993-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.65.+n
71.45.Gm
Opis:
The paper is devoted to the investigation of the single-electron excitation spectrum, effective exchange interaction and dielectric susceptibility of the Muller model for high-temperature superconductivity. It is shown that the interaction with the anharmonic vibration mode leads to the additional splitting of the electron bands and their narrowing. The sign of the effective exchange interaction between electrons depends on the local state of the vibration subsystem. The electron and pseudospin (lattice) contributions to the transverse dielectric susceptibility are investigated.
Źródło:
Acta Physica Polonica A; 1993, 84, 2; 293-313
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Phonons in HgCdMnTe Using Far-Infrared Reflectivity
Autorzy:
Dudziak, E.
Bożym, J.
Pruchnik, D.
Baran, J.
Powiązania:
https://bibliotekanauki.pl/articles/1929684.pdf
Data publikacji:
1993-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.30.Fs
71.45.Gm
Opis:
The first reflectivity spectra of Hg$\text{}_{1-x-y}$Cd$\text{}_{x}$Mn$\text{}_{y}$Te with 0.03 < x < 0.1 and 0 < y < 0.05 were measured in the spectral region 700-30 cm$\text{}^{-1}$ at 300 K and 90 K. The quaternary alloys measured show three mode behaviour. The experimental results are interpreted by using a classical dynamic dielectric function model.
Źródło:
Acta Physica Polonica A; 1993, 84, 3; 595-598
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exchange Integrals in Hg$\text{}_{0.95}$Mn$\text{}_{0.05}$Se Obtained by the Wave Shape Analysis of Shubnikov-de Haas Oscillations
Autorzy:
Dybko, K.
Kossut, J.
Powiązania:
https://bibliotekanauki.pl/articles/1929722.pdf
Data publikacji:
1993-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.20.My
71.70.Gm
Opis:
The Shubnikov-de Haas oscillations were measured in Hg$\text{}_{0.95}$Mn$\text{}_{0.05}$Se at liquid helium temperatures, in magnetic fields up to 13 tesla. The analysis of the experimental data was performed by means of the wave shape method. The dependence of effective g-factor of the conduction electrons and difference Dingle temperature on magnetic field was determined. Non-zero difference Dingle temperature is a clear evidence of spin dependent scattering in this material. The sp-d exchange constants consistent with extracted spin splitting and difference Dingle temperature, α = -0.39 ± 0.06 eV, β = 0.95 ± 0.07 eV, are in good agreement with the values obtained from magnetooptics.
Źródło:
Acta Physica Polonica A; 1993, 84, 4; 697-700
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Correlations and Electron-Molecular Vibration Coupling in Pentamerized Charge Transfer Crystals
Autorzy:
Yartsev, V. M.
Garrigou-Lagrange, C.
Powiązania:
https://bibliotekanauki.pl/articles/1933375.pdf
Data publikacji:
1995-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.45.Gm
78.30.Jw
Opis:
A cluster approach is used for a theoretical description of the optical properties of pentamerized low-dimensional molecular crystals. Electronic correlations are taken into account explicitly in the Hubbard model for 1, 2, 3, 4 and 5 electrons in a linear pentamer, as well as coupling of electrons to the totally symmetric intramolecular vibrations. Calculated absorbance is compared to the measured one in pentamerized salt of TCNQ and TTF molecules.
Źródło:
Acta Physica Polonica A; 1995, 87, 4-5; 819-822
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamics of the Molecules in Solid Phases of Few Chosen Schiff Bases Compounds
Autorzy:
Bąk, A.
Massalska-Arodź, M.
Powiązania:
https://bibliotekanauki.pl/articles/2037298.pdf
Data publikacji:
2004-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.Md
77.22.Gm
Opis:
The dielectric relaxation processes observed in solid phases of MBBA, OH-MBBA, and EBBA belonging to the homologous series of the Schiff bases are discussed. The data are compared with the results completed by the present authors for EBPA compound. The uniform interpretation of the temperature changes of relaxation for all mentioned compounds is proposed.
Źródło:
Acta Physica Polonica A; 2004, 105, 5; 467-474
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlation-Driven Metal-Insulator Transitions
Autorzy:
Honig, J. M.
Powiązania:
https://bibliotekanauki.pl/articles/2011236.pdf
Data publikacji:
2000-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.30.+h
71.45.Gm
Opis:
The effect of correlation-driven electronic transitions are described for the V$\text{}_{2}$O$\text{}_{3}$, NiS$\text{}_{2-x}$Se$\text{}_{x}$, and Fe$\text{}_{3}$O$\text{}_{4}$ systems. The various tranformations can all be rationalized in terms of elementary concepts pertaining to the Mott-Hubbard intraatomic electronic interactions or in terms of an order-disorder formalism involving Coulomb interactions among electrons on adjacent sites. Attention is directed to some outstanding issues that require further resolution.
Źródło:
Acta Physica Polonica A; 2000, 97, 1; 141-156
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dielectric Spectroscopy Studies of 4-Cyano-3-fluorophenyl 4-Butylbenzoate Liquid Crystal at High Pressure
Autorzy:
Rozwadowski, T.
Massalska-Arodź, M.
Juszyńska, E.
Krawczyk, J.
Wojnarowska, Ż.
Paluch, M.
Powiązania:
https://bibliotekanauki.pl/articles/1419574.pdf
Data publikacji:
2012-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.M-
77.22.Gm
Opis:
For 4-cyano-3-fluorophenyl 4-butylbenzoate, nematic glassformer at ambient pressure, dielectric relaxation studies were performed under elevated pressure. In the isobaric experiment, on cooling the nematic phase two superarrhenius α-relaxations, ascribed to the reorientations of molecules around short axes and precession of long molecular axes were found and the Arrhenius β-relaxation related to intramolecular motions. Complexity of dynamics at elevated and ambient pressure is similar. Shift towards lower frequencies was found for both α-relaxations.
Źródło:
Acta Physica Polonica A; 2012, 122, 2; 378-381
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł

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