Misfit dislocations, in CdMnTe/CdTe(001) epitaxial structures with a low (0.3%) mismatch, were compared under conditions where the deposit was in tension or compression. When the deposit was in tension, the misfit dislocations were parallel to interfacial <110> directions and were either 60º dislocations with ½<110> Burgers vectors inclined to the interface, or were 90º dislocations with 1/6<112> Burgers vectors which bounded intrinsic stacking faults. When the deposit was in compression, the misfit dislocations had ½<110> Burgers vectors which were inclined to the interface but which lay predominantly in <100> directions. The observations were explained in terms of a

model in which the forces that acted upon the individual Shockley partials of a dissociated ½<110> dislocation tended to widen and narrow the stacking fault in the tension and compression cases, respectively. It was argued that the tendency of the dislocation to become undissociated when the deposit was in compression permitted alternative slip planes to operate. It was also suggested that <100> segments of dislocation were generated by a multiple cross-slip mechanism rather than by {110} glide. Evidence was also presented for the operation of the multiple cross-slip mechanism in a ZnTe/CdMnTe structure with a high (5.6%) mismatch.

D.Cherns, C.T.Chou, J.W.Steeds, D.A.Ashenford, B.Lunn: Philosophical Magazine Letters, 1993, 67[5], 323-30