Czochralski Crystal Growth in the System PtMn sub x Sb2 sub (-x).

Crystal growth in the system PtMn sub x Sb sub (2-x) was investigated to explore the possibilities of materials in that system as magnetic semiconductors. Good PtSb sub 2 single crystals were grown by liquid encapsulated Czochralski growth in BN crucibles. The grown crystals were p-type with wig 10 sup (18) carriers/cm sup 3. Te doping produced n-type material and the distribution constant for Te was found to be wig 1. Mn doping produced reaction with SiO sub 2 crucibles requiring BN crucible liquid encapsulated Czochralski growth. The melt composition PtMn sub (.25) Sb sub (1.75) first froze to produce PtSb sub 2 and then produced several phases indicating that congruently melting stoichiometries with X 1 will be unlikely. PtMnSb melted at a temperature near 1100C (considerably below PtSb sub 2) and froze to form single phase PtMnSb. The crystals had large grains (at least 1 mn). This is the first reported growth of essentially single crystals of the interesting semi-magnetic, high Kerr rotation material, PtMnSb. These successful results indicate that Czochralski growth is a promising technique for discovering new magnetic semiconducting materials.