STUDY OF OPTICAL AND MAGNETOOPTICAL ANISOTROPY OF THE CD1-XMNXTE CRYSTAL

By using the magneto-optical and transmission-ellipsometric methods, g iant anisotropy in both optical and magneto-optical properties was fou nd for the single crystal Cd1-xMnxTe (x = 0.45). Two orthogonal axes E (perpendicular to) and E(parallel to), were in the (113) plane, and al ong the [<(4) over bar 7> <(1) over bar>] and [<21 (1) over bar>] dire ctions, respectively. The crystal has two refractive indexes of n(perp endicular to) and n(parallel to) and can be made a zero-field retarder . Not only the micro twin crystalline structure but also possibly the order replacement of Cd2+ by Mn2+ with induced lattice distortion thro ugh the whole body of the crystal along the [111] orientation can caus e the optical and magneto-optical anisotropy. Both transmission-ellips ometric and magneto-optic Faraday rotation spectra located peaks at th e same similar to 2 eV E(Mn) position, that was in the gap between the conduction and valence bands. In discussion, E(Mn) was attributed to the optical transition of Te p --> Mn d(down arrow). A better understa nding of Cd1-xMnxTe anisotropy will reveal further the behavior of Mn2 + that can account for the properties of the crystal. Copyright (C) 19 96 Elsevier Science Ltd.