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3 Acta Physica Polonica A

3 1997

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Temperature Dependence of Raman Scattering by Magnons in Bulk-Like MBE-Gwn MnTe Films

100%

Szuszkiewicz W. , Mohrange J. , Jouanne M. , Kanehisa M. , Świrkowicz R. , Dynowska E. , Janik E. , Wojtowicz T. , Kossut J.

nr 5

1025-1028

Temperature dependence of the magnon frequency was studied for cubic MnTe epilayers by the Raman scattering measurements. Experimental data are compared to the results of theoretical calculations performed within the framework of the Heisenberg model using Green's function formalism.

Selected Properties of Lattice Dynamics of HgSe and β-HgS

100%

Szuszkiewicz W. , Dybko K. , Dynowska E. , Górecka J. , Witkowska B. , Hennion B. , Jouanne M. , Julien C.

nr 5

1029-1032

Optical phonon dispersion for β-HgS was measured by the neutron scattering for the first time. The results confirmed theoretically predicted anomalous behavior of phonon modes in this material, resulting probably from high ionicity of mercury sulphide and large difference of Hg and S atomic mass. Influence of the isotopic effects on the TO-phonon mode for HgSe and HgS is analyzed. The possible observation of such effects in IR reflectivity spectra taken for HgSe at low temperature is discussed.

Raman Characterization of MBE-Grown Layered MnTe/CdTe Structures

80%

Szuszkiewicz W. , Jouanne M. , Morhange J. F. , Kanehisa M. A. , Mariette H. , Hartmann J. M. , Dynowska E. , Karczewski G. , Wojtowicz T. , Kossut J. , Barnaś J.

nr 5

1021-1024

Raman scattering measurements on (MnTe)_{8}/(Cd_{0.64}Zn_{0.36}Te)_{8} multilayer grown by MBE method and on various (MnTe)_{n}/(CdTe)_{12} multilayers (where n=8,12,16,24) were performed at low temperatures. In the z̅(x,x)z polarization, structures corresponding to folded acoustic phonons were found. In z̅(x,y)z polarization new complex structures were observed in the low-frequency part of Raman scattering spectra. A possible magnetic origin of these structures is discussed.