Wszystkie pola: Mn2+ - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Modulation of the Shubnikov-de Haas Oscillations by the Exchange Interaction in Cd$\text{}_{3-x-y}$Zn$\text{}_{x}$Mn$\text{}_{y}$As$\text{}_{2}$
Autorzy:: Lubczyński, W.
Cisowski, J.
Portal, J.
Powiązania:: https://bibliotekanauki.pl/articles/1887020.pdf
Data publikacji:: 1991-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 72.20.My
Opis:: New measurements of the Shubnikov-de Haas (SdH) effect in semimagnetic semiconductor (SMSC) Cd$\text{}_{3-x-y}$Zn$\text{}_{x}$Mn$\text{}_{y}$As$\text{}_{2}$ with x = 0.09 and y = 0.018, using continuous magnetic fields up to 25 T, are presented. The observed modulation of the amplitudes of the first and second SdH harmonics as a function of magnetic field is interpreted in terms of the three band Kane model with the exchange interaction included and taking into account the spin-dependent scattering which appears to be particularly important at high magnetic fields.
Źródło:: Acta Physica Polonica A; 1991, 79, 2-3; 377-379
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Magnetic Specific Heat of (Cd$\text{}_{1-x-y}$Zn$\text{}_{y}$Mn$\text{}_{x}$)$\text{}_{3}$As$\text{}_{2}$
Autorzy:: Bednarski, H.
Cisowski, J.
Schmitt, D.
Voiron, J.
Portal, J. C.
Lubczyński, W.
Powiązania:: https://bibliotekanauki.pl/articles/1929727.pdf
Data publikacji:: 1993-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.40.-s
75.30.Et
Opis:: The specific heat of (Cd$\text{}_{1-x-y}$Zn$\text{}_{y}$Mn$\text{}_{x}$)$\text{}_{3}$As$\text{}_{2}$ with low Mn concentration (x ≤ 0.067) and for two Zn contents (y = 0.14 and y = 0.34) has been measured in the temperature range of 1.5-30 K. The magnetic contribution to the total specific heat has been analysed within our generalized pair approximation model which takes into account the complicated tetragonal crystal structure of Cd$\text{}_{1-x-y}$Zn$\text{}_{y}$Mn$\text{}_{x}$)$\text{}_{3}$As$\text{}_{2}$. Assuming that the total Mn-Mn interaction strength is a sum of superexchange and the Bloembergen-Rowland exchange, we have obtained a very good agreement between our approach and experiment by using the analytical formulae with only two adjustable parameters, i.e. the first nearest-neighbour exchange constants for both mechanisms which appear to be strongly dependent on Zn content.
Źródło:: Acta Physica Polonica A; 1993, 84, 4; 705-708
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Anisotropy of the Exchange Interaction in Mn-Alloyed II$\text{}_{3}$-V$\text{}_{2}$ Compounds
Autorzy:: Lubczyński, W.
Cisowski, J.
Portal, J. C.
Powiązania:: https://bibliotekanauki.pl/articles/1888120.pdf
Data publikacji:: 1991-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 72.20.My
Opis:: An anisotropy of the electron effective g-factor in highly degenerated tetragonal semimagnetic semiconductors (SMSC) alloyed with manganese has been found by us and by other workers when studying the Shubnikov-de Haas (SdH) effect for different orientations of the magnetic field with respect to the crystal axes. The detailed analysis of the experimental data by using a model based on an infinite Hamiltonian matrix, provides evidence for the anisotropy of the p-d exchange interaction in the materials of interest.
Źródło:: Acta Physica Polonica A; 1991, 80, 2; 275-278
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Influence of Pressure on Magnetization of (Cd$\text{}_{1-x-y}$Zn$\text{}_{y}$Mn$\text{}_{x}$)$\text{}_{3}$As$\text{}_{2}$
Autorzy:: Bednarski, H.
Cisowski, J.
Lubczyński, W.
Voiron, J.
Portal, J. C.
Powiązania:: https://bibliotekanauki.pl/articles/1931965.pdf
Data publikacji:: 1995-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.30.Cr
Opis:: The influence of hydrostatic pressure up to 0.6 GPa on magnetization of (Cd$\text{}_{1-x-y}$Zn$\text{}_{y}$Mn$\text{}_{x}$)$\text{}_{3}$As$\text{}_{2}$ with various compositions was studied at 4.2 K and in magnetic fields up to 7 T. The obtained experimental data were analysed within our generalized pair approximation model, treating the total Mn-Mn interaction strength as a sum of superexchange and the Bloembergen-Rowland exchange. As a result, we obtained satisfactory agreement between our approach and experiment by introducing a pressure dependence of p-d hybridization potential V$\text{}_{pd}$ in the form V$\text{}_{pd}$ ∝ d$\text{}^{-4}$, where d is the Mn-As bond length which decreases with pressure.
Źródło:: Acta Physica Polonica A; 1995, 87, 1; 205-208
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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