Sphalerite–rock salt phase transition in ZnMnSe heterostructures

Litvinov, D.; Gerthsen, D.; Rosenauer, A.; Daniel, B.; Hetterich, M.
August 2004
Applied Physics Letters;8/2/2004, Vol. 85 Issue 5, p751
Academic Journal
We report on the investigation of epitaxial MnSe layers grown on ZnSe by transmission electron microscopy. MnSe/ZnSe superlattices (SLs) with different nominal MnSe thicknesses tMnSe between 2 and 20 monolayers (MLs) were investigated, which were grown by molecular-beam epitaxy on GaAs(001) substrates. Composition profiles of the SLs were evaluated by the measurement of local (002) lattice parameters in growth direction. A MnSe deposition between 2 and 4 MLs on ZnSe leads to the formation of intermixed Zn1-xMnxSe layers with sphalerite structure and a Mn concentration x increasing from 50% to 90%. For MnSe layers with a thickness between 6 and 20 ML, we observe 5–10 nm small MnSe inclusions with a rock salt structure embedded in sphalerite Zn1-xMnxSe with approximately 90%Mn.


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