Abstract
Dilute magnetic semiconductors (DMS) form a class of semiconducting materials obtained by substituting a fraction of cations with a magnetic ion, e.g. Zn0.9Co0.1S. These alloys exhibit a variety of novel magneto-optical properties coming from the exchange interaction between the magnetic ions and the conduction or valence electrons (s–p exchange interaction). This interaction is increased at high pressure and may induce phase transitions. In this paper, Zn0.9Co0.1S has been studied under high pressure up to 28 GPa. At ambient conditions it crystallizes in the sphalerite structure with the same lattice parameter as ZnS. At high pressure the most intense peaks of the blende phase have been observed up to 17 GPa, but new peaks appear above 12.7 GPa. The new peaks have been indexed in a disordered rock-salt phase. This phase is stable at least up to 28 GPa (maximum pressure reached in this experiment). The unit cell volume has been fitted with a first-order Murnaghan equation of state. The deduced bulk moduli are B = (84 ± 2) GPa in the zinc-blende phase and B = (119 ± 16) GPa in the NaCl phase, with B' = 4 in both cases. The recovered phase is identical to the initial phase at 0 GPa.
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