Manganese Distribution in CdMnTeSe Crystals. EXAFS Data Analysis

The extended X-ray absorption fine structure (EXAFS) technique has been used to investigate the first shell coordination in zinc-blende quaternary Cd1x Mnx Τe1y Sey (0.0 < x < 0.15; 0.0 < y < 0.20) alloys. The experimental data have been collected with the use of synchrotron radiation. All the nearest-neighbour distances have been found as linearly dependent on Se and Mn concentration. For each composition a consistent deviation from full random distribution of Mn atoms around Se and Te atoms was observed. Possible reasons of preferential Mn-Se over Mn-Te pairing were discussed. PACS numbers: 61.10.-i, 61.72.Vv, 75.50.P