Autor: Łusakowski, A. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Free Carrier Concentration Dependence of Gd-Gd Exchange Constant in SnTe:Gd
Autorzy:: Łusakowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/1934066.pdf
Data publikacji:: 1995-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.30.Hx
75.30.Et
71.70.Gm
Opis:: In some samples of SnTe:Gd the measured paramagnetic Curie temperature strongly depends on the Fermi level position. The semi-quantitative theory which explains this effect is presented. The theory is based on Kasuya's model of exchange interaction between two 4f spins of rare earth ions. In this model the interaction between 4f electrons and the valence band goes via Gd atomic 5d orbitals which, contrary to the 4f orbitals are much more extended in space. The exchange integral and the paramagnetic Curie temperature dependence on the Fermi level position are calculated.
Źródło:: Acta Physica Polonica A; 1995, 88, 5; 1018-1022
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Distance Dependence of the Mn-Mn Exchange Interaction in IV-VI Semimagnetic Semiconductors
Autorzy:: Łusakowski, A.
Górska, M.
Powiązania:: https://bibliotekanauki.pl/articles/2036858.pdf
Data publikacji:: 2003-06
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.70.Gm
75.30.Hx
Opis:: In the present paper we calculate the exchange interaction between two manganese ions in IV-VI semiconductors with the rocksalt structure. The method of calculations is based on the fourth order perturbation theory with respect to hybridization between band states and localized d orbitals of Mn ions. This hybridization is described by three Harrison integrals: V$\text{}_{pdσ}$,V$\text{}_{pdπ}$, and V$\text{}_{sdσ}$. The band states of IV-VI semiconductor are obtained from the semiempirical tight binding model built from s and p orbitals of cations and anions. The resulting exchange term in the Hamiltonian is of the form -Σ$\text{}_{i,j=xyz}$J$\text{}_{ ij}$Ŝ$\text{}_{i}^{1}$Ŝ$\text{}_{j}^{2}$, however nondiagonal terms of the exchange integral tensor J$\text{}_{i≠j}$ are very small. The dependence of J$\text{}_{ij}$ on the Mn-Mn distance is non-monotonic. We also discuss the influence of the local crystal deformations on the exchange integral.
Źródło:: Acta Physica Polonica A; 2003, 103, 6; 659-664
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Is the Magnetism of HgSe:Fe Clearly Understood?
Autorzy:: Dybko, K.
Łusakowski, A.
Kossut, J.
Arciszewska, M.
vd Linden, P. J. E. M.
Wittlin, A.
Perenboom, J. A. A. J.
Mycielski, A.
Powiązania:: https://bibliotekanauki.pl/articles/1931952.pdf
Data publikacji:: 1995-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.30.Hx
75.20.Hr
Opis:: The high magnetic field magnetization measurements of low composition Hg$\text{}_{1-x}$Fe$\text{}_{x}$Se (0.0002 < x < 0.003) at temperatures ranging from 1.6 K to 40 K and in magnetic fields up to 20 T are reported. The magnetization in a sample containing only Fe$\text{}^{3+}$ ions (x = 0.0002) is described by the Brillouin function (j = 5/2). The magnetization in the sample codoped with Ga, containing only Fe$\text{}^{2+}$ is well described in the model of isolated Fe$\text{}^{2+}$ ions. The latter model takes into account the tetrahedral crystal field, the spin-orbit interaction and the Zeeman term. On the other hand, the magnetization of sample with both Fe$\text{}^{3+}$ and Fe$\text{}^{2+}$ present simultaneously (x = 0.003) is shown to be different from a simple additive superposition of the contributions due to Fe$\text{}^{3+}$ and Fe$\text{}^{2+}$ subsystems. The possible origin of this discrepancy is discussed.
Źródło:: Acta Physica Polonica A; 1995, 87, 1; 193-196
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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