RAMAN-SPECTRA OF INAS1-XSBX ALLOYS AND INAS0.58SB0.42 INSB STRAINED-LAYER SUPERLATTICE UNDER HIGH-PRESSURE/

Raman scattering has been measured in InAs1-xSbx alloys (0 less than o r equal to x less than or equal to 1) and an InAs0.58Sb0.42/InSb strai ned layer superlattice under hydrostatic pressures up to tile phase tr ansition. The pressure coefficient of tile Raman frequency (partial de rivative w/partial derivative p) of the InAs-like LO mode in InAs1-xSb x alloys increases with increasing composition x, while that of the In Sb-like LO mode is almost constant above x = 0.5. The phase transition pressure of InAs1-xSbx alloys decreases almost linearly with composit ion. On the other hand, both component layers of an InAs0.58Sb0.42/InS b superlattice change phase simultaneously at a pressure which is the mean of tile phase transition pressures for bulk InAs0.58Sb0.42 and In Sb.