Hydrostatic pressure enhancement of the Curie temperature and anomalous Hall effect in Sb$_{2-x}$Cr$_{x}$Te$_{3}$*

The narrow band gap tetradymite-type semiconductors with the form A$_{2}^{V}$B$_{3}^{VI}$ (A = Sb, Bi and B = Se, Te) are normally associated with thermoelectric cooling devices. However, Sb$_{2}$Te$_{3}$ doped with V or Cr and Bi$_{2}$Te$_{3}$ doped with Fe display a ferromagnetic transition at low temperatures. We have investigated electrical transport properties of bulk single crystals of the ferromagnetic diluted magnetic semiconductor Sb$_{2-x}$Cr$_{x}$Te$_{3}$ under varying pressure (0 GPa to 1.5 GPa), temperature (2 K to 300 K), and magnetic fields (0 T to 6 T). High pressure measurements afford a reversible way to tune both the electronic structure and magnetic interactions of these materials. The behavior of the Curie temperature T$_{C}$ can be monitored via the position of the peak in the resistance data associated with the ferromagnetic transition. We observe that T$_{C}$ increases with increasing pressure in this compound. The anomalous Hall effect with clear hysteresis is also observed below T$_{C}$, and trends with pressure will be discussed.