Changes in optical properties of MnAs thin films on GaAs(001) induced by alpha- to beta-phase transition
Résumé
MnAs layers with 45 nm thickness were grown epitaxially on GaAs(001) substrates. Ellipsometry measurements were made in the spectral range 0.045 eV to 6 eV as a function of temperature (between -10 °C and 50 °C) at 70° of incidence. In this way the transition from the hexagonal -phase to the orthorhombic -phase could be monitored. Non-zero off-diagonal elements of the Jones matrix for an azimuth of 38° off the [10] axis of the substrate indicate that the optical functions of MnAs are anisotropic in both phases. The optical conductivity exhibits low-energy interband transitions around 0.3 eV, more clearly seen in the -phase than in the -phase. Extrapolation of the optical conductivity to zero frequency confirms that the -phase is about two times more conducting than the -phase. A broad structure is observed in the visible range around 3 eV. The -phase is characterised by an anisotropy induced energy difference of this structure with a maximum at 2.8 eV for the extraordinary index and at 3.15 eV for the ordinary index. This difference vanishes in the -phase in which anisotropy mainly induces changes in amplitude of the 3 eV structure. The assignment of the structures will be discussed.