Autor: Sivachenko, A. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The study of crystal and magnetic properties of MnNi0.85Fe0.15Ge
Autorzy:: Budzyński, M.
Valkov, V. I.
Golovchan, A. V.
Mitsiuk, V. I.
Sivachenko, A. P.
Surowiec, Z.
Tkachenka, T. M.
Powiązania:: https://bibliotekanauki.pl/articles/148187.pdf
Data publikacji:: 2015
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: Mössbauer effect
magnetic interaction
hexagonal structure
Opis:: Magnetic and Mössbauer measurements were performed for MnNi0.85Fe0.15Ge. The Mössbauer data indicate that Fe atoms in MnNi0.85Fe0.15Ge are randomly distributed over two types of metal sites in hexagonal structure. At 77 K, the hyperfi ne magnetic fi elds at Fe located in different crystal sites have similar values of about 12.7 and 12.3 T. The random site distribution of the iron atoms in the non-magnetic hexagonal phase at high temperatures is confi rmed by the theoretical calculations in fully relativistic Korringa−Kohn−Rostoker (KKR) method.
Źródło:: Nukleonika; 2015, 60, 1; 11-14
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: High-Pressure Studies of Semiconductors in the Far-Infrared: Donor States in Quasi-2D
Autorzy:: Weinstein, B. A.
Tischler, J. G.
Chen, R. J.
Nickel, H. A.
McCombe, B. D.
Dzyubenko, A. B.
Sivachenko, A.
Powiązania:: https://bibliotekanauki.pl/articles/2014129.pdf
Data publikacji:: 2000-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.66.Fd
73.20.Dx
73.20.Hb
Opis:: We review recent experimental advances by the Buffalo group in performing far-infrared magnetospectroscopy under fine tuning of applied high hydrostatic pressure. Experiments are reported for the effects of pressure on Si donors in modulation doped GaAs/AlGaAs quantum wells. We clearly observe pressure-mediated competition between free (i.e., Landau level) and bound electron states - the latter arising from both neutral (D$\text{}^{0}$) and charged (D$\text{}^{-}$) donor species. With increasing pressure, there is a progression of the observed spectra from being dominated by cyclotron resonance and the D$\text{}^{-}$ singlet (or singlet-like bound magnetoplasmon) transitions, to showing the D$\text{}^{0}$ 1s → 2p$\text{}^{+}$ line. The main reason for this evolution is the decrease in electrons due to the crossover of the Si levels associated with the Γ (well) and X (barrier) conduction minima. Indeed, for pressures above 30 kbar the Γ(well)-X(barrier) crossover quenches all the transitions. However, we find strong evidence that electrons are independently lost to a trap, which becomes active several kbar below this crossing. A possible candidate for this trap is residual Se impurities in the barriers. We present the results of detailed numerical calculation which are found to agree very well with the measured field dependencies of the cyclotron resonance, D$\text{}^{0}$ and D$\text{}^{-}$ transition energies. In the sample with the highest doping, a new transition is observed for fields and pressures above 7.5 T and 5 kbar. Reasons for this apparent anomaly are discussed.
Źródło:: Acta Physica Polonica A; 2000, 98, 3; 241-257
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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