Low-frequency magnons and phonons in hexagonal MnTe

Wojciech Szuszkiewicz 1,  Bernard Hennion 2,  Barbara Witkowska 1,  Andrzej Mycielski 1

1. Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, Warszawa 02-668, Poland
2. Laboratoire Leon Brillouin, CEA-CNRS, CE Saclay (LLB), Gif-sur-Yvette 91191, France

Abstract
There is a continuous interest in the properties of II-VI based diluted magnetic semiconductors. The mixed crystals containing Mn and pure MnTe were the object of intensive studies for many years.
The zinc blende modification of MnTe is a metastable phase of this compound and can be grown by the non-equilibrium growth methods only (like, e.g., MBE). Several properties of this compound are now well known. On the contrary, the knowledge about the properties of hexagonal (stable) phase of MnTe is much more limited.
We have started to study the low-frequency collective excitations in hexagonal MnTe by means of inelastic neutron scattering. Single MnTe crystals were grown and characterized at the Institute of Physics of the Polish Academy of Sciences in Warsaw. Neutron scattering measurements were performed at Laboratoire Leon Brillouin in Saclay (France). Low-frequency acoustic phonons as well as magnetic excitations (magnons) have been observed at room temperature and their dispersion along selected high-symmetry directions of the Brillouin zone has been determined. Results of our preliminary measurements were compared with the dispersion of magnons in zinc blende MnTe. The similarities and the differences in the lattice dynamics and in the magnetic properties of both MnTe phases were shown and discussed.
Presentation: oral at E-MRS Fall Meeting 2004, Symposium F, by Wojciech Szuszkiewicz
See On-line Journal of E-MRS Fall Meeting 2004
Submitted: 2004-05-20 00:39
Revised:   2004-07-20 16:58
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