High-temperature magnetic and optical properties of CdTe-MnTe superlattices

We present a study of magnetic and magneto-optical properties of CdxTe1-x-M nTe superlattices up to the room temperature. A comparison of low-temperatu re exciton Zeeman effect and the measurements of the magnetization performe d by superconducting quantum interface device magnetometer shows a perfect agreement with a model description, thus allowing for determination of Mn c ontent profiles width throughout the structures. Precise high-temperature Z eeman effect measurements show that the exciton splitting decreases with te mperature faster than expected on the basis of the Curie-Weiss law. We attr ibute this effect to the influence of thermal fluctuations on exciton state s. [S0163-1829(99)05311-4].