Autor: Witowski, A. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Spin-Lattice Relaxation of CdMnTe, Measured with a Pick-up Coil in a High Magnetic Field
Autorzy:: Strutz, T.
Witowski, A.
Wyder, P.
Powiązania:: https://bibliotekanauki.pl/articles/1927546.pdf
Data publikacji:: 1991-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 76.30.-v
78.20.Ls
78.47.+p
Opis:: The spin-lattice relaxation (SLR) time of Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te with x=0.008 is measured directly under electron spin resonance condition in a magnetic field of 8.9 T, using a pick-up coil. The SLR times are measured for different sample temperatures between 3.0K and 35K and compared with data of a more diluted sample with x=0.002. The SLR times are shorter than expected for single spin SLR. Moreover, the temperature dependence of the SLR time does not show any of the characteristic behaviours for single spin SLR. Thus, the observed SLR times are explained by cross relaxation of single spins with spin clusters.
Źródło:: Acta Physica Polonica A; 1991, 79, 1; 149-153
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: The Relaxation of Mn Pairs in CdMnTe at High Magnetic Fields
Autorzy:: Strutz, T.
Witowski, A. M.
Wyder, P.
Powiązania:: https://bibliotekanauki.pl/articles/1890763.pdf
Data publikacji:: 1991-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 76.30.-v
78.20.Ls
78.47.+p
Opis:: The spin-lattice relaxation in CdMnTe at 4.7 K has been measured at high magnetic fields up to 24.5 T. At fields, where the ground state of nearest-neighbor exchange coupled Mn pairs changes due to energy level crossing, an increase in the relaxation rate is observed. This is attributed to the change of relaxation of nearest-neighbor Mn pairs. It proves that not only large size Mn clusters are involved in the relaxation as it has been shown previously, but also Mn pairs. It shows as well that the mixing of pair states is quite effective.
Źródło:: Acta Physica Polonica A; 1991, 80, 3; 313-316
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Changes of FIR Reflectivity of HgSe:Cr in a Magnetic Field
Autorzy:: Hausenblas, M.
Wyder, P.
Witowski, A. M.
Wittlin, A.
Mycielski, A.
Powiązania:: https://bibliotekanauki.pl/articles/1921666.pdf
Data publikacji:: 1992-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.20.Ls
78.30.Fs
Opis:: The results of FIR magnetoreflectivity of HgSe:Cr are presented. They are interpreted using a classical dynamic dielectric function.
Źródło:: Acta Physica Polonica A; 1992, 82, 5; 741-744
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Do the Mixed Crystals HgSeS Exhibit the One-Mode Behavior?
Autorzy:: Szuszkiewicz, W.
Witowski, A. M.
Julien, C.
Balkanski, M.
Dybko, K.
Witkowska, B.
Mycielski, A.
Powiązania:: https://bibliotekanauki.pl/articles/1924226.pdf
Data publikacji:: 1992-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.20.Ls
78.30.Fs
Opis:: The low-temperature far-infrared reflectivity spectra of HgSe and HgSeS are measured and analysed. The results suggest the one-mode behavior of phonon excitations in HgSeS mixed crystals.
Źródło:: Acta Physica Polonica A; 1992, 82, 5; 887-889
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 5.

Tytuł:: Infrared Spectroscopy of GaAs Doped with Mn
Autorzy:: Rutkowska, A.
Wasik, D.
Witowski, A.
Sadowski, M.
Orłowski, W.
Strzelecka, G.
Hruban, A.
Kamińska, M.
Twardowski, A.
Potemski, M.
Powiązania:: https://bibliotekanauki.pl/articles/2044531.pdf
Data publikacji:: 2005-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.70.Ej
78.20.Ls
78.30.Fs
Opis:: We found that the fine structure related to Lyman spectra of [Mn$\text{}^{2+}$(d$\text{}^{5}$) + a hole] centers in GaAs was present only for samples with low Mn concentration. Such samples, at low temperature, did not show any hopping conductance within Mn impurity band. Magnetooptical measurements revealed that magnetic field induced splitting of the Lyman optical transitions was larger than Zeeman splitting observed for typical shallow acceptors in GaAs, like Be, Zn, and C. This experimental result proved that in the case of Mn acceptor impurity, the exchange coupling of a hole and the S = 5/2 Mn$\text{}^{2+}$(d$\text{}^{5}$) core could not be neglected, which was in accordance with the [Mn$\text{}^{2+}$(d$\text{}^{5}$) + a hole] model of the neutral Mn center in GaAs.
Źródło:: Acta Physica Polonica A; 2005, 108, 5; 845-849
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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